#1PIEDMONT LITHIUM LITHIUM-MADE IN THE USA Helping Secure America's Energy Security 2023 Macquarie Australia Conference May 2023 Nasdaq :PLL ODASX :PLL ARBN 647 286 360 LiOH 00000#2DISCLAIMERS 2 Forward Looking Statements This presentation contains forward-looking statements within the meaning of, or as described in, securities laws in the United States and Australia, including statements regarding exploration, development and construction activities of Piedmont Lithium, Sayona Mining and Atlantic Lithium; current plans for mineral and chemical processing projects of Piedmont and its partners); projections of market demand and prices; statements about the timing and amount of reserve and resource declarations and chemical processing operations; strategy; value; returns; capital allocation and investment; expectations regarding permitting; costs and expenses; and statements about the timing and ability to complete scoping and feasibility studies. Such forward-looking statements involve substantial and known and unknown risks, uncertainties and other risk factors, many of which are beyond our control, and which may cause actual timing of events, results, performance or achievements and other factors to be materially different from the future timing of events, results, performance or achievements expressed or implied by the forward-looking statements. Such risk factors include, among others: (i) that Piedmont will be unable to commercially extract mineral deposits to Tesla, LG Chem or otherwise, (ii) that the properties of Piedmont or its partners may not contain expected reserves or resources, (iii) risks and hazards inherent in the mining business (including risks inherent in exploring, developing, constructing and operating mining projects, environmental hazards, industrial accidents, weather or geologically related conditions), (iv) uncertainty about Piedmont's, Sayona Mining's or Atlantic Lithium's ability to obtain required capital to execute their business plans, (v) Piedmont's, Sayona Mining's or Atlantic Lithium's ability to hire and retain required personnel, (vi) changes in the market prices of lithium and lithium products, (vii) changes in technology or the development of substitute products, (viii) uncertainties inherent in exploration, development and production activities, including risks relating to permitting, zoning and regulatory approvals for the projects of Piedmont or its partners, (ix) uncertainties inherent in the estimation of lithium resources, (x) risks related to competition, (xi) risks related to information, data and projections disclosed by third parties, including Piedmont's partners, (xii) occurrences and outcomes of claims, litigation and regulatory actions, investigations and proceedings, (xiii) risks regarding our ability to achieve profitability, enter into and deliver product under supply agreements on favorable terms, obtain sufficient financing, comply with governmental regulations and obtain necessary permits, and (xiv) other uncertainties and risk factors set out in filings and disclosures made by Piedmont and its partners from time to time, including filings with the U.S. Securities and Exchange Commission ("SEC") and the Australian Securities Exchange ("ASX"). The forward-looking statements, projections and estimates in this presentation are given only as of the date of this presentation and actual events, results, performance and achievements could vary significantly from the forward-looking statements, projections and estimates presented in this presentation. Readers are cautioned not to put undue reliance on forward-looking statements. Piedmont disclaims any intent or obligation to update publicly such forward-looking statements, projections and estimates, whether as a result of new information, future events or otherwise. Additionally, Piedmont, except as required by applicable law, undertakes no obligation to comment on analyses, expectations or statements made by third parties in respect of Piedmont, its partners or their respective financial or operating results or securities. Qualified Persons Statement We have reported mineral reserves, which were prepared in accordance with Regulation S-K Item 1300 (as promulgated by the SEC, "S-K 1300")) and the 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (the "JORC Code") (as required by the ASX), in connection with our exploration and evaluation activities. As of December 31, 2022, we reported 18.3 million metric tons of probable mineral reserves at a grade of 1.10% Li₂O. We issued our first mineral resource estimate pursuant to S-K 1300 and the JORC Code on October 21, 2021 and have not finalized any subsequent estimates. The proven and probable reserve figures presented herein are estimates based on information available at the time of calculation. The mineral resource figures presented herein are estimates based on information available at the time of calculation and do not include that portion of our mineral resources that been converted to proven and probable reserves as shown above, as they are reported exclusive of mineral reserves. We have reported mineral resources, prepared in accordance with S-K 1300, as part of our exploration and evaluation activities. As of December 31, 2022, we have reported 25.89 million metric tons of mineral resources, exclusive of mineral reserves, at a grade of 1.06% Li₂O. An initial Technical Report Summary with respect to our estimated mineral reserves was filed as an exhibit to our Transition Report for the six-month period ending December 31, 2021. An Amended Technical Report Summary, dated April 20, 2023 (the "Amended TRS"), was filed as Exhibit 96.3 to our most recent Form 10-K/A to include certain information as required by S-K 1300. Key assumptions and parameters relating to our estimates of mineral reserves and resources are discussed in Sections 1.9 and 1.10 of the Amended TRS. We intend to publish reserves annually and recalculate reserves if any new significant changes are expected, taking into account metal prices, changes to estimates of future production and costs, divestments and depletion, as well as any acquisitions and additions. As required by ASX Listing Rules, Piedmont confirms that: a) it is not aware of any new information or data that materially affects the information included in our most recent form 10-K/A; b) all material assumptions and technical parameters underpinning mineral reserves, mineral resources, production targets, and related forecast financial information derived from production targets included in our form 10-K/A continue to apply and have not materially changed; and c) the form and context in which the relevant Qualified Persons' findings are presented in this report have not been materially modified from the Amended TRS. Nasdaq : PLL ASX: PLL PIEDMONT LITHIUM#3DISCLAIMERS Cautionary Note to United States Investors Concerning Estimates of Measured, Indicated and Inferred Mineral Resources Standards for Assessing Mineral Reserves and Resources As a U.S. public company listed in the United States and Australia, Piedmont is required to comply with the resource estimation standards of both S-K 1300 and the JORC Code. Certain of Piedmont's partners instead comply with the JORC Code or Canadian National Instrument 43-101, Standards of Disclosure for Mineral Projects ("NI 43-101"). Each of these standards contain specific meanings for terms such as "mineral resource", "measured mineral resource", "indicated mineral resource" and "inferred mineral resource" "proven mineral reserves," "probable mineral reserves" and for various types of technical studies. Although the principles for reporting mineral reserves and resources, including subcategories of measured, indicated and inferred resources, are broadly similar under each set of standards, we caution you that estimates prepared solely under the JORC Code or NI 43-101 are not fully comparable to similarly titled measures disclosed under S-K 1300 or the other reporting and disclosure requirements of the U.S. federal securities laws, rules and regulations. Mineral Reserves and Resources of Piedmont Mineral reserve and mineral resource information contained in this presentation for the Carolina Lithium Project was prepared by Piedmont in accordance with S-K 1300 and the JORC Code. Mineral Reserves and Resources of Sayona Quebec Mineral reserve and mineral resource information contained in this presentation for the Authier and North American Lithium Projects was prepared by Sayona in accordance with the JORC Code and NI 43-101. Such information was not prepared in accordance with S-K 1300. Mineral Reserves and Resources of Atlantic Lithium Mineral reserve and mineral resource information contained in this presentation for the Ewoyaa Project was prepared by Atlantic Lithium in accordance with the JORC Code. Such information was not prepared in accordance with S-K 1300. In September 2022, Atlantic Lithium announced the successful completion of a technical study for Ewoyaa in accordance with the JORC Code, demonstrating the potential of Ewoyaa to produce low-cost spodumene concentrate using a dense medium only processing technique. In the Atlantic Lithium technical study, 24.5% of the mined tons reported in the production target was based on the inclusion of inferred resources. There is a low level of geological confidence associated with inferred mineral resources, and there is no certainty that further exploration work would result in a determination of measured or indicated mineral resources resulting from the inferred resources, that the inferred resources would be converted to mineral reserves or that the production target itself would be realized. Although Atlantic Lithium has characterized this technical study as a prefeasibility study, due to the inclusion of the inferred resources, we consider the production target and its associated economics as a scoping study. 3 Nasdaq: PLL ASX: PLL PIEDMONT LITHIUM#44 WHY PIEDMONT? Onshoring to the United States U.S. Government EV Focus Near-Term Cash Flow Potential Strong Commercial Agreements Large Spodumene Resource Base Downstream Integration to Hydroxide Diversification by Project and Geography CORPORATE SNAPSHOT Nasdaq ASX PIEDMONT LITHIUM Shares/CDIs Outstanding (100 CDIS = 1 Share) 19.18 mm 1,918.2 mm Price (@4/28/23) $57.50 A$0.86 Average Daily Trading Volume (90-day) $28 mm A$2 mm Market Cap (@ 4/28/23) $1.1 bb $129 mm Equity Interests at Market (@ 4/28/23) $185 mm A$1.6 bb A$196 mm A$279 mm RESEARCH COVERAGE Cash (Est. 3/31/23) B RILEY'Securities BTIG CANACCORD Genuity Clarksons Platou Securities DA DAVIDSON EVERCORE ISI Loop Capital MACQUARIE TROTH Capital Partners TD TD Cowen TUOHY BROTHERS a division of TD Securities INVESTMENT RESEARCH INC#5SHORTFALLS ANTICIPATED IN THE U.S. U.S. Battery Plants Expected to Require >40x¹ Current U.S. Lithium Hydroxide Capacity SELECTED U.S. GIGAFACTORIES STELLANTIS LG Energy Solution ANNOUNCED ANNUAL GIGAFACTORY DEMAND AND US LIOH SUPPLY CAPACITY BY 2030 HONDA LG Energy Solution Ford 40 GWh facility in Fayette County, Ohio. 35 GWh LFP battery cell facility in Marshall, Michigan. 800 40 GWh battery cell facility in Lordstown, Ohio. iM3NY 700 Capacity of 1 GWh and expandable to more than 15 GWh. 600 ultium cells 35 GWh plant in Ohio, and 50 GWh plants in Tennessee and Michigan. LG Energy Solution Expanding a 5 GWh plant in Holland, Michigan to 40 GWh. Panasonic Expected to be 50 GWh in De Soto, Kansas. TESLA Two operational plants with =44 GWh in Nevada. Working to open Gigafactory Texas and has a pilot line in Fremont, California. LG Energy Solution 11 GWh cylindrical battery plant in Queen Creek, Arizona. STELLANTIS SAMSUNG SDI 33 GWh battery cell facility in Kokomo, Indiana. LO 5 PIEDMONT Tennessee LITITION PIEDMONT Carolina LITHIN Ford SK To produce 129 GWh annually in 500 Kentucky and Tennessee. TOYOTA To build a 30 GWh battery cell facility in Greensboro, NC.. 400 300 VIN FA S T First North American plant in North Carolina, with production by 2024. 200 ENVISION Multi-year partnership to provide battery cells. First 30 GWh plant in South Carolina. 100 -17,000/tpy1 SK 0 HYUNDAI Current Capacity gm SAMSUNG SDI Announced joint venture will build 30 GWh factory opening in 2026. Location TBD. SK Two plants in Georgia with initial capacities of 10 and 12 GWh and the potential to increase beyond 25 GWh. Joint venture building 35 GWh factory in Bartow county, Georgia. FREYR 34 GWh battery cell manufacturing in Coweta County, Georgia. 123 ~180,000/tpy2 PIEDMONT LITHIUM Planned Capacity ~715,000/tpy³ 2030 Demand Based on current US capacity of 17k tonnes per year ("tpy") and announced gigafactory demand of 715k tpy. Estimated supply based on existing capacity, supplier technical studies, and corporate announcements Estimated demand is estimated based on a 0.9 Mt LiOH intensity per MWh of demand.#6U.S. GOVERNMENT EV FOCUS Piedmont is Well-Positioned to Benefit from America's Pro-EV Policies DEPARTMENT OF ENERGY Battery Materials Grant Programs Advanced Technology Vehicle Manufacturing Loans ☐ Piedmont selected for $141.7 million grant for Tennessee Lithium4 ■ Grant to be funded alongside Piedmont project equity contributions ■ ATVM loan applications submitted 5 " Historically, long-term loans at US Treasuries flat INFLATION REDUCTION ACT Advanced Manufacturing Production Credit (45X) Clean Vehicle Credit (30D) Commercial Clean Vehicles (45W) ☐ ■ 45X - Advanced Manufacturing Production Credit Production tax credit equal to 10% of annual production costs Available only to U.S. taxpayers Credits are tradeable ■ 30D - Clean Vehicle Tax Credit $7,500 credit for qualifying light vehicle purchases Credit requires escalating usage of 'domestic' critical minerals (includes FTA countries) ■ 45W provides up to $40,000 credit for large commercial vehicles 6 4./5./6. See End Notes for corresponding detailed disclosures Nasdaq : PLL ASX: PLL PIEDMONT LITHIUM#7LOCATION MATTERS! Toronto Detroit Quebec Val-d'Or Buffalo Quebec City Montreal New York Charlotte Carolina Lithium Tennessee Lithium 7 Ghana UNITED STATES ■ US domicile improves access to US capital markets ■ Russell 2000 inclusion / over 20% of PLL shares held by Index Funds Well-positioned to benefit from the IRA and other US government programs Southeastern United States has become the "Battery Belt" QUEBEC Based near Val-d'Or, a major mining service center No requirement for fly-in/fly-out labor Reliable, clean and sustainable hydropower Proximity to rail network to access St. Lawrence Seaway and US markets GHANA Project site is 1km from a paved road and 110km from port at Takoradi Hydro and solar power proximate to site Strong national employment, training programs, and community engagement Mining friendly jurisdiction - mining is the largest tax-paying sector in the country7 TENNESSEE Near planned and existing cathode, battery, and automotive plants Development-ready site located near rail, highways and waterways Strong local workforce, business climate and government support CAROLINA ☐ Located on the Carolina Tin-Spodumene Belt in Gaston County, NC Single integrated site Outstanding transport and power infrastructure Proximity to lithium and byproduct markets 7. According to the U.S. Department of Commerce's Country Commercial Guide for Ghana#88 PIEDMONT PROJECT PORTFOLIO Quebec8 Ownership: 25% Piedmont / 75% Sayona Mining Piedmont owns 13.6% of Sayona Mining Ghana 10 Ownership: 50% Piedmont / 50% Atlantic Lithium Piedmont owns 9.4% of Atlantic Lithium Project Authier + NAL Project 11 Ewoyaa Tennessee Ownership: 100% Piedmont Carolina Ownership: 100% Piedmont Project 12 Tennessee Lithium Project 13 Carolina Lithium Location Abitibi, Quebec, Canada Location Cape Coast, Ghana Location McMinn County, TN Location Gaston County, NC Reserves 32.9Mt @ 1.04% Li₂O Reserves 18.9Mt @ 1.24% Li₂O Reserves N/A Reserves 18.3Mt @ 1.10% Li₂O Production Year 1-4: 226,000tpy SC LOM: 190,000tpy SC (113,000tpy to PLL) Production 255,000tpy SC6 (50% to PLL) Production 30,000tpy LiOH Production 30,000tpy LiOH; 242,000tpy SC6 Economics $1.0bb after-tax NPV $80mm capex Economics $1.3bb after-tax NPV $125mm capex Economics $2.5bb after-tax NPV $376mm steady state EBITDA $2.0bb after-tax NPV Economics $459mm steady state EBITDA 8./9./10./11./12./13. See End Notes for corresponding detailed disclosures#9Lithium Chemicals Spodumene Concentrate PIEDMONT SHARE OF ANNUAL MARKETABLE CAPACITY Illustrative Share of Production 14 2023 2024 2025 2026 2027+ Sayona Quebec 15 56,500 113,000 113,000 113,000 113,000 Atlantic Lithium16 Carolina Lithium17 Produced SC6 Feedstock for Conversion 18 127,500 127,500 127,500 242,000 56,500 113,000 240,500 240,500 482,500 195,000 390,000 Spodumene Concentrate Available for Sale 56,500 113,000 240,500 45,500 92,500 LiOH - Tennessee Lithium 19 30,000 30,000 LiOH Carolina Lithium 17 - Li2CO3 Sayona Quebec 20 - LiOH Available for Sale 30,000 tbd 30,000 60,000 14./15./16./17./18./19./20. See End Notes for corresponding detailed disclosures#10FIRST PRODUCTION ACHIEVED Q1 2023 Indicative Timelines - Actual Timelines Remain Subject to Permitting and Funding 2023 QUEBEC NAL Restart 2024 2025 Spodumene Concentrate Production GHANA DFS / Permitting Construction TENNESSEE FEED/ Permitting / Financing CAROLINA Permitting / Rezoning / FEED / Financing Construction 2026 2027+ Spodumene Concentrate Production Construction Possible Lithium Carbonate Production 21 Lithium Hydroxide Production Spod Con. & LiOH Production 10 21. Potential lithium carbonate or lithium hydroxide production from Quebec is the subject of further technical studies. Sayona Mining is undertaking a prefeasibility study to complete the partially-constructed lithium carbonate plant at the North American Lithium facility. PFS expected in Q2 2023.#11PEER BENCHMARKING PLL Offers Scale, Diversification and Downstream Integration, with Near-term Production at NAL PLL $791 CXO $1,133 Enterprise Value22 PLL CXO SYA $1,181 SYA Pro-Rata Spodumene Reserves (LCE kt)23 Annual Planned 6% Spodumene Concentrate Production 23 Annual Planned Lithium Chemical Production23 PLL NAL Ewoyaa Carolina PLL Tennessee Carolina CXO Finniss SYA NAL LAC $3,040 LAC LAC SGML $3,534 SGML LTR $3,721 LTHM $3,975 $2,000 $4,000 USD $mm LTR LTHM 0 500 1,000 1,500 2,000 2,500 Proven Probable CXO SYA LAC Cauchari TP - Phase 1 (Li2CO3) (Li2CO3) TP - Phase 2 (Li2CO3) SGML Phase 1 Phase 2 SGML LTR Kathleen Valley LTHM Nemaska 0 250,000 500,000 750,000 LTR LTHM Li2CO3 LI2CO3 to LiOH Nemaska 0 40,000 80,000 120,000 11 Ore Reserves Tonnes per Year Tonnes per Year 22. Enterprise Values consist of market capitalization, total debt, minority interests, preferred stock, and convertible preferred stock less cash and short-term investments. Data is sourced from Factset as of April 28, 2023 and shown in US$mm. 23. Figures are based on disclosed resource updates and average life of mine production estimates. Production estimates may include the use of inferred resources. Proportional rights and offtake agreements are reflected. Note that projects for which technical studies have not been completed are excluded. See Peer Project Notes for additional disclosures surrounding production estimates and supporting studies.#1212 NAL RESTART COMPLETED Restart Completed in March as Scheduled; DFS Published in April NAL RESTART24 ■ Only major new source of spodumene concentrate expected in North America in the near-term ■ Commercial operations commenced with deliveries to Port of Quebec City ongoing ■ First commercial shipment to customers targeted for Q3 2023 ■ Continued upgrades underway to improve operational efficiency, reliability, grade, quality, and recoveries DEFINITIVE FEASIBILITY STUDY25 ■ Production target increased to 226,000 tonnes per year for first four years of operation and 190,000 tpy thereafter Included strategic review of Mineral Resource and Reserves resulting in increased head grade ■ PFS for completion of on-site carbonate refinery to be completed in Q2 2023 24. See Piedmont announcement "Sayona Mining and Piedmont Lithium Announce Successful Restart of North American Lithium" dated March 30, 2023, a copy of which can be found on our Company website or in our SEC filings. 25. See Sayona Mining ASX announcement "DFS Confirms NAL Value with A$2.2B NPV" dated April 14, 2023, a copy of which can be found on Sayona Mining's website. Spodumene concentrate at NAL NAL Site#13COMMERCIAL ARRANGEMENTS Piedmont will Sell Spodumene Concentrate Until Conversion Plants are Operational PIEDMONT AS CUSTOMER PIEDMONT AS SUPPLIER SAYONA QUÉBEC 113,000TPY SC - LOM 26 > 113,000tpy or 50% of production Market price subject to floor & ceiling Floor $500/t; ceiling $900/t SC6 Life of mine Secondary feedstock for Tennessee Evaluating options for conversion in Quebec LG Chem 200,000T SC - 4 YEARS28 50,000tpy commencing H2 2023 Priced with reference to Fastmarkets SC6 pricing ■ To be supplied via SYQ offtake ATLANTIC LITHIUM ~127,500TPY SC - LOM27 50% of Ghanaian production Market pricing Life of mine Primary feedstock for Tennessee T TESLA 125,000T SC - 3 YEARS29 ■ First shipment planned for late-2023 ■ Priced with reference to Fastmarkets LiOH pricing ■ To be supplied via SYQ offtake 13 26./27./28./29. See End Notes for corresponding detailed disclosures#1414 ILLUSTRATIVE POTENTIAL CASH FLOW FROM NAL OFFTAKE Piedmont's Offtake Agreement is for the Greater of 113ktpy or 50% of Production for Life of Mine Annual Offtake EBITDA ($mm) $600 $500 $400 $300 $200 $100 $500 (Floor) $900 (Ceiling) $1,900 $2,900 $3,900 $4,900 $5,900 6% Spodumene Concentrate Price per Tonne 5.0% 5.5% 6.0% Illustrative EBITDA calculated at various spodumene concentrate prices and grades, assuming Piedmont pays a market price subject to a floor and ceiling price of $900/t and $500/t SC6, respectively. Piedmont sales are conducted at the listed price per tonne. Purchase and sale prices are adjusted for concentrate grade. Additional costs (e.g., freight) are not considered. Nasdaq : PLL ASX: PLL PIEDMONT LITHIUM#15FUNDING OUR GROWTH Objective - Maximize Growth While Minimizing Equity Dilution BALANCE SHEET ■ $129mm estimated cash at 3/31/23 ■ $185mm equity value in shares of Sayona Mining and Atlantic Lithium OPERATING CASH FLOW ■ Successful NAL restart in Q1 2023 with first shipments targeted for Q3 2023 ■ As customer, Piedmont will buy SC at ceiling price of $900/t and sell to customers ■ As investor, Piedmont will earn 25% of joint venture profits ■ $142mm DOE grant for Tennessee 30 GOVERNMENT PROGRAMS CUSTOMER FINANCING ■ ATVM applications submitted for Tennessee and Carolina 31 Evaluating development financing options for Ghana ■ Discussions underway with prospective strategic partners ■ Structures may include offtake prepays, loans, joint ventures, or equity investments ■ Funding availability will drive timing of Tennessee development 15 30. Grant funding subject to finalization of terms and conditions between Piedmont Lithium and the U.S. Department of Energy. 31. As a result of our grant award, our eligibility for an ATVM loan for Tennessee Lithium may be reduced or we may elect not to pursue an ATVM loan for the Tennessee Lithium Project. Nasdaq : PLL ASX: PLL PIEDMONT LITHIUM#1616 ACCOMPLISHMENTS / MILESTONES Piedmont Lithium Development Plans are On Track RECENT ACCOMPLISHMENTS ✓ Quebec Ghana Updated Ore Reserves at NAL of 21.7Mt @ 1.08% Li₂032 Positive PFS for restart of NAL mine/concentrator Strong enhancement to construction and operations teams Ore Reserves estimated at 18.9Mt @ 1.24% Li₂033 Ewoyaa PFS published indicating $1.3bb NPV and 224% IRR33 Mining license application submitted October 2022 Tennessee Lithium Selection of Etowah, TN as site for 30,000tpy LiOH plant Kiewit / Primero to perform Front-End Engineering Design $142mm DOE grant award announced October 2022 Carolina Lithium Permitting processes ongoing Community outreach ongoing Completion of funding of committed land purchases Corporate Strong additions to technical and corporate teams ☑ Piedmont added to Russell 2000 Small Cap Index $122mm (net) equity offering to fund project development 2023 MILESTONES AND ACCOMPLISHMENTS ☐ Quebec ☐ Ghana On-sale of PLL's 113,000tpy spodumene concentrate offtake First spodumene concentrate production expected in H1 2023 First shipments and revenue expected H2 2023 Resource update Definitive Feasibility Study Mining License Tennessee Definitive Feasibility Study Lithium hydroxide offtake Project finance ☐ Carolina Mine permit Air permit Land rezoning Corporate Continue to expand engineering team Strategic partnerships and project financing Evaluate consolidation opportunities 32. Refer to Sayona Mining ASX announcement "DFS Confirms NAL Value with A$2.2B NPV" dated April 14, 2023, a copy of which can be found on Sayona Mining's website. 33. Production target and economics include the use of inferred mineral resources which have a low level of geological confidence and as such we consider them to be at a scoping study level. Refer to cautionary note on page 3 of this presentation. See Atlantic Lithium announcement "Pre-Feasibility Study Delivers Robust Project Economics" dated September 22, 2022, a copy of which can be found on Atlantic Lithium's website.#17Project PEER PROJECT NOTES Company Annual SC Production Ownership Study Level34 Annual Lithium Chemical Production Pro-rata Production Source Piedmont Lithium Sayona Quebec 35 25% DFS > 113,000 or 50% of production 113,000 ASX Announcement - DFS Confirms NAL value with A$2.2B NPV, April 14, 2023 Piedmont Lithium Ewoyaa36 50% PFS 255,000 127,500 AIM Announcement - Robust Ewoyaa Pre-Feasibility Study, September 22, 2022 Piedmont Lithium Tennessee Lithium 100% DFS 30,000 30,000 PLL Press Release - Piedmont Lithium Completes DFS of Tennessee Lithium Project, April 20, 2023 Piedmont Lithium Carolina Lithium 100% DFS 242,000 30,000 30,000 PLL Press Release - Piedmont Completes BFS of the Carolina Lithium Project, December 14, 2021 Sayona Mining Sayona Quebec35 75% DFS 190,000 142,500 ASX Announcement - DFS Confirms NAL value with A$2.2B NPV, April 14, 2023 Core Lithium Finniss 100% DFS 173,000 173,000 ASX Announcement - Definitive Feasibility Study Investor Presentation, July 26, 2021 Liontown Resources Kathleen Valley 100% DFS 500,000 500,000 ASX Announcement - Kathleen Valley DFS Presentation, November 11, 2021 Lithium Americas Cauchari-Olaroz 49% DFS 40,000 17,920 Lithium Americas Website - Cauchari-Olaroz Overview Lithium Americas Thacker Pass (Phase 1) 100% DFS 40,000 40,000 Lithium Americas Website - Thacker Pass Project Summary Lithium Americas Thacker Pass (Phase 2) 100% DFS 40,000 40,000 Lithium Americas Website - Thacker Pass Project Summary Sigma Lithium Grota do Cirilo (Phase 1) 100% DFS 270,000 270,000 Grota do Cirilo (Phase 2 & Sigma Lithium 100% PFS 496,000 496,000 3) Livent Carbonate for Sale37 100% Livent Carbonate Conversion 38 100% Operational/ Expansion Operational / Expansion 30,000 30,000 45,000 45,000 Press Release - Sigma Lithium Achieves Outstanding Project Expansion, December 4, 2022 Press Release - Sigma Lithium Achieves Outstanding Project Expansion, December 4, 2022 Livent Website - Corporate Presentation, February 2023 Livent Website - Corporate Presentation, February 2023 Livent Nemaska 39 50% DFS 205,000 34,000 102,500/17,000 Livent Website - Corporate Presentation, February 2023 34. 35. 36. 37./38./39. See End Notes for corresponding detailed disclosures#1818 PIEDMONT LITHIUM LITHIUM MARKETS Nasdaq :PLL ASX :PLL ABN 50 002 664 495 LiOH#19$10,000 $0 7/31/2017 10/31/2017 1/31/2018 4/30/2018 7/31/2018 BATTERY GRADE LITHIUM HYDROXIDE PRICES (US$/MT) $90,000 $80,000 $70,000 $60,000 10/31/2018 1/31/2019 4/30/2019 7/31/2019 10/31/2019 1/31/2020 4/30/2020 7/31/2020 10/30/2020 LITHIUM PRICES OFF ALL-TIME HIGHS $9,000 $8,000 $7,000 $50,000 $5,000 $40,000 $4,000 Spot Price: $40,750/t $30,000 Piedmont Study Price - $26,000/t $3,000 $20,000 $2,000 Piedmont Study Price - $1,600/t 1/29/2021 4/30/2021 7/30/2021 10/29/2021 1/31/2022 4/29/2022 7/29/2022 10/31/2022 1/31/2023 Current $1,000 $0 $6,000 19 Source: Fastmarkets CIF China 'mid-price' for lithium hydroxide and spodumene 6% through April 28, 2023. "Piedmont Study Price" and "Piedmont Study Percentage" are fixed prices assumed in the financial model developed for our Tennessee Lithium DFS. 7/31/2017 10/31/2017 1/31/2018 4/30/2018 7/31/2018 10/31/2018 1/31/2019 4/30/2019 7/31/2019 10/31/2019 1/31/2020 4/30/2020 7/31/2020 10/30/2020 1/29/2021 4/30/2021 7/30/2021 10/29/2021 1/31/2022 4/29/2022 7/29/2022 10/31/2022 1/31/2023 SPODUMENE CONCENTRATE 6% PRICES (US$/MT) Current 0.0% 7/31/2017 Spot Price: $4,050/t 4.0% 2.0% 10/31/2017 1/31/2018 4/30/2018 7/31/2018 10/31/2018 1/31/20 1/31/2019 4/30/2019 Nasdaq: PLL 7/31/2019 8.0% 000 6.0% 10/31/2019 1/31/2020 4/30/2020 7/31/2020 10/30/2020 10.0% SC6% PRICES AS A PERCENT OF BATTERY GRADE LITHIUM HYDROXIDE 12.0% Piedmont Study Percentage - 6.2% 1/29/2021 4/30/2021 7/30/2021 10/29/2021 ASX: PLL PIEDMONT LITHIUM 1/31/2022 ZZOZ/IS/L 4/29/2022 7/29/2022 10/31/2022 1/31/2023 Current#20EV DEMAND PROJECTED TO GROW DRAMATICALLY Demand has Exceeded Expectations; Supply has Struggled to Keep Up ELECTRIC VEHICLE SALES AND PENETRATION RATE FORECASTS Q4 2021 FORECAST VS. Q4 2022 FORECAST 100 90 80 70 60 50 40 30 20 10 2020 MATERIAL-CONSTRAINED VS. UNCONSTRAINED ELECTRIC VEHICLE SALES FORECAST (MM UNITS) 80% 70 70% 60 60 60% 50 50 50% 40 40% 30 30% 20 20% 20 10% 0% 2025 2030 2035 2040 Q4'22 Sales Forecast Q4'21 Penetration Rate Q4'22 Penetration Rate I Q4'21 Sales Forecast Source: Benchmark Minerals Intelligence Lithium Forecast 20 10 10 2020 2025 ■Material-constrained sales forecast Source: Battery Material Review, Westbeck Capital estimates 2030 2035 Unconstrained sales forecast Nasdaq: PLL ASX: PLL PIEDMONT LITHIUM#21PIEDMONT LITHIUM PIEDMONT LITHIUM 21 21 Nasdaq :PLL ASX :PLL ABN 50 002 664 495 LiOH#22LEADERSHIP Management Team with the Right Technical, Financial, and Project Execution Experience Patrick Brindle Chief Operating Officer Bruce Czachor Chief Legal Officer Austin Devaney Chief Commercial Officer DRA 22 22 Shearman SHEARMAN & STERLING KEITH PHILLIPS Chief Executive Officer is COWEN J.P.Morgan Merrill Lynch Kris McVey Chief Administrative Officer Michael White Chief Financial Officer Monique Parker SVP, Safety, Environment & Health Nick Fouche SVP, Capital Projects Erin Sanders SVP, Corporate Communications & IR Lamont Leatherman Chief Geologist ALBEMARLE CHAMPIONx AALBEMARLE Rio Tinto MICHELIN OXY tc. TRANSCONTINENTAL AEGION OWENS CORNING NPS+ BHP སས་ noranda SOUTH 32 Burson-Marsteller Kemira Rockwood EY HEXCEL 1. ERO CHERNOFF NEWMAN Lithium#23QUEBEC NAL Restart Achieved March 2023 as Scheduled Piedmont Offtake Customers LG Chem & Tesla HIGHLIGHTS ☐ Piedmont Interest 36 13.6% SYA shares = $161mm ▪ 25% of Sayona Quebec SYA USD market cap = $1.2bb Offtake - 113,000tpy SC6 with ceiling price of $900/t Among Canada's largest and best- located lithium projects NAL is a past-producer with C$400mm of capital investment ■ Good road and rail access ■ Skilled local labor and contractors ■ Low-cost renewable hydroelectricity UPCOMING MILESTONES PFS for completion of on-site carbonate refinery to be completed in H1 2023 ■ First shipments and revenue expected for Q3 2023 23 Canadian Prime Minister Justin Trudeau visits North American Lithium Pictured: Sayona Quebec CEO Guy Belleau, Sayona Mining CEO Brett Lynch, Prime Minister Justin Trudeau, Piedmont VP of Government Affairs Malissa Gordon, and Piedmont Lithium Chairman Jeff Armstrong SAYONA SYA FACT SHEET37 Location Business Production PLL Offtake³8 Offtake Price Shipments Capex Québec Spodumene Concentrate Year 1-4: 226,000tpy SC LOM: 190,000 SC Greater of 50% of production or 113,000tpy Price Floor: $500/t Price Ceiling: $900/t Q3 2023 $80mm Opex After-tax NPV8 $691/t SC6 $1.0bb 36. Piedmont owns -1.2bb shares of Sayona Mining (ASX: SYA) and 25% of the Sayona Quebec joint venture. Market cap as of April 28, 2023. 37. See Sayona Mining ASX announcement "DFS Confirms NAL Value with A$2.2B NPV" dated April 14, 2023, a copy of which can be found on Sayona Mining's website. 38. Refer to Piedmont's announcement dated June 28, 2022 for a summary of offtake agreement terms, a copy of which can be found on our Company website or in our SEC filings.#24GHANA Atlantic Lithium May Provide Additional High-Quality SC6 to Support North American LiOH Operations HIGHLIGHTS ■ Piedmont Interest39 ☐ ■ 9.4% ALL shares = $24mm ☐ Earning 50% of Ghanaian lithium portfolio ■ ALL market cap = $254mm ■ Offtake - 50% of life-of-mine production at market ■ Mining-friendly jurisdiction ■ ☐ ~70 miles from major port along national highway Efficient transport to Tennessee for hydroxide conversion ■ Coarse-grained spodumene implies ■ low capex DMS flowsheet Adjacent hydroelectric powerlines UPCOMING MILESTONES ▪ Definitive feasibility study 24 ☐ Mining License 2023 MINISTRY OF LANDS AND NATURAL RESOURCES Above: Piedmont COO Patrick Brindle meets with US Ambassador Virginia Palmer and Ghanaian Minister of Lands & Natural Resources Samuel Abu Jinapor ALL FACT SHEET40 Location Business Production PLL Offtake DFS Timing Ghana Spodumene Concentrate 255,000tpy SC6 50% of annual production 2023 $125mm Capex Opex $278/t SC6 After-tax NPV8 $1.33bb After-tax IRR 224% 39. Piedmont owns 56.9mm shares of Atlantic Lithium (AIM: ALL) and has an earn-in agreement for 50% of the Ewoyaa project. Market cap as of April 28, 2023. 40. Production and economics include the use of inferred resources which have a low level of geological confidence and as such we consider them to be at a scoping study level. See Atlantic Lithium AIM announcement "Pre- Feasibility Study Delivers Robust Project Economics" dated September 22, 2022, a copy of which can be found on Atlantic Lithium's website. Refer to cautionary statement on Page 3 of this presentation.#25TENNESSEE LITHIUM 100% Owned by Piedmont Lithium HIGHLIGHTS ☐ 30,000tpy LiOH Production Spodumene feed from market sources, including offtake agreement with Atlantic Lithium ■ Excellent rail, river, and road transport ■ Sister plant to the LiOH plant planned at Carolina Lithium ■ Selected for $142mm DOE grant under Bipartisan Infrastructure Law UPCOMING MILESTONES ■ Front end engineering design ■ Lithium hydroxide offtake ■ Potential project financing 25 Site Plan TEN FACT SHEET41 Location Etowah, McMinn County, TN minn Authority Product mak make it in Lithium Hydroxide Production 30,000tpy LiOH Feedstock Capex 196,000tpy SC6 $809 million Opex EBITDA $13,673/t LiOH $376mm Piedmont CEO Keith Phillips at Tennessee Lithium site selection announcement 6000 After-tax NPV8 $2.5 billion After-tax IRR 32% Payback 2.8 years 41. Refer to announcement "Piedmont Lithium Completes Definitive Feasibility Study of Tennessee Lithium Project" dated April 20, 2023, a copy of which can be found on our Company website or in our SEC filings.#26CAROLINA LITHIUM 100% Owned by Piedmont Lithium CAR HIGHLIGHTS ▪ Located in Gaston County, NC, the cradle of the lithium business ■ Strong infrastructure ☐ ■ Single integrated site ■ Skilled local labor ■ Proximity to lithium and ☐ ☐ byproduct markets ■ Industry-leading ESG profile ☐ Projected to be a low-cost producer UPCOMING MILESTONES ☐ Permitting and rezoning ▪ Detailed engineering / FEED ■ LiOH and byproduct offtake ■ Potential project financing 26 ☐ ■ Strategic partnering ■ ATVM loan PIEDMONT Inge Charle Bus "We have to lead by example. And if we do that, we'll accelerate our self-dependence and eliminate reliance on China by decades. And that's why I support this project." U.S. Senator Thom Tillis, speaking at the groundbreaking for Piedmont's new corporate HQ in Belmont, NC, August 31, 2022. FACT SHEET42 Location North Carolina, USA Lithium Hydroxide 30,000tpy LiOH 242,000tpy SC6 $988 million $4,377/t LiOH Product Production Feedstock Capex Opex EBITDA After-tax NPV 8 After-tax IRR Payback 27% $459mm first 10 years $2.0 billion 3.5 years 42. Refer to results of PLL Bankable Feasibility Study announcement dated December 14, 2021, a copy of which can be found on our Company website or in our SEC filings. Estimates prepared pursuant to SEC S-K 1300 and the JORC Code.#27END NOTES Copies of the documents referred to in the end notes below can be found on the Company's website or in our SEC filings. U.S. Government EV Focus 4. Grant funding subject to finalization of terms and conditions between Piedmont Lithium and the U.S. Department of Energy. 5. 6. As a result of our grant award, our eligibility for an ATVM loan for Tennessee Lithium may be reduced or we may elect not to pursue an ATVM loan for the Tennessee Lithium Project. There can be no certainty as to the actual interest rate for which Piedmont may be eligible under the ATVM program. Piedmont Project Portfolio 8. 9. Piedmont owns a 25% interest in Sayona Quebec and a 13.6% equity interest in Sayona Mining, resulting in an effective economic interest of ~35%. Refer to Sayona Mining ASX announcement "DFS Confirms NAL Value with A$2.2B NPV" dated April 14, 2023, a copy of which can be found on Sayona Mining's website. 10. Piedmont can earn a 50% interest in Atlantic Lithium's Ghanaian lithium portfolio and owns a 9.4% equity interest in Atlantic Lithium. 11. Production target and economics are based inclusion of inferred mineral resources which have a low level of geological confidence and as such we consider them to be at a scoping study level. Refer to cautionary note on page 3 of this presentation. See Atlantic Lithium announcement "Pre-Feasibility Study Delivers Robust Project Economics" dated September 22, 2022, a copy of which can be found on Atlantic Lithium's website. 12. Refer to Piedmont Lithium press release dated April 20, 2023 for Definitive Feasibility Study. 13. Refer to the result of Piedmont Lithium Bankable Feasibility Study announcement dated December 14, 2021, Estimates prepared pursuant to SEC S-K 1300 and the JORC Code. Piedmont Share of Annual Marketable Capacity 14. Figures represent PLL's pro rata share of year-end nameplate capacity and not projected annual production. 15. Piedmont has an offtake agreement for the greater of 113,000 tpy or 50% of nameplate production. Project nameplate is 190,000tpy life of mine average spodumene concentrate based on feasibility study results announced by Sayona Mining. See Sayona Mining ASX announcement "DFS Confirms NAL Value with A$2.2B NPV" dated April 14, 2023, a copy of which can be found on Sayona Mining's website. 16. Piedmont has an earn-in agreement for 50% offtake of SC6 production. Piedmont offtake is based on production results which includes the use of inferred resources which have a low level of geological confidence and as such we consider them to be at a scoping study level. See Atlantic Lithium announcement "Pre-Feasibility Study Delivers Robust Project Economics" dated September 22, 2022, which can be found on Atlantic Lithium's website. Refer to cautionary statement on Page 3 of this presentation. 17. Refer to updated Amended Technical Report Summary for the Carolina Lithium Project filed with our form 10-K/A dated April 25, 2023. 18. Based on estimate of 195,000tpy of SC6 to produce 30,000tpy LiOH. 19. See Piedmont Lithium announcement "Piedmont Lithium Completes Definitive Feasibility Study of Tennessee Lithium Project" dated April 20, 2023. 20. Sayona Mining is undertaking a prefeasibility study to complete the partially-constructed lithium carbonate plant at the North American Lithium facility. PFS expected in Q2 2023. Commercial Arrangements 26. See Piedmont announcement "Piedmont Lithium and Sayona Mining Formalize Restart Plans for North American Lithium in Quebec" dated June 28, 2022. 27. Piedmont offtake is based on production results which includes the use of inferred resources which have a low level of geological confidence and as such we consider them to be at a scoping study level. See Atlantic Lithium announcement "Pre-Feasibility Study Delivers Robust Project Economics" dated September 22, 2022, which can be found on Atlantic Lithium's website. Refer to cautionary statement on Page 3. 28. See Piedmont announcement "Piedmont Lithium and LG Chem Sign Equity Investment and Binding Offtake Agreements" dated February 16, 2023. 29. See Piedmont announcement "Piedmont Lithium Amends Agreement with Tesla" dated January 3, 2023. 27 27 Nasdaq : PLL ASX: PLL PIEDMONT LITHIUM#2828 END NOTES Copies of the documents referred to in the end notes below can be found on the Company's website or in our SEC filings. Peer Project Notes 34. The studies listed and associated production estimates are completed using varying classifications of Ore Reserves and Mineral Resources. Production estimates may include the use of inferred resources which have a low level of geological confidence and as such we would consider them to be at a scoping study level. 35. Sayona Quebec includes the projects owned by the joint venture between Sayona Mining and Piedmont in the Abitibi Hub, which encompasses North American Lithium, Authier and Tansim. North American Lithium and Authier are the subject of the DFS. 36. As part of its agreement announced by Atlantic Lithium on July 1, 2021, Piedmont has the right to earn a 50% interest in the Ewoyaa project, subject to terms and conditions. Production target is based inclusion of inferred mineral resources which have a low level of geological confidence and as such we consider them to be at a scoping study level. Refer to cautionary note on page 3 of this presentation. 37. Carbonate for Sale represents Livent's disclosure for estimated 2028 year-end capacity. This includes current capacity of 20k tpy and expansions amounting to 50k tpy before removing Carbonate to Feed Hydroxide. The existing production and future expansion are related to production from the Salar del Hombre Muerto. 38. Carbonate Conversion represents Livent's disclosure for estimated 2028 year-end lithium hydroxide capacity, which will utilize Livent's lithium carbonate as feedstock. The annual production capacity combines 25k tpy existing capacity and 20k tpy future expansions related to production from the Bessemer City, North Carolina and Zhejiang, China facilities. 39. Nemaska is the subject of a Definitive Feasibility Study which was released by Nemaska Lithium and filed with SEDAR on July 31, 2019. It is currently the subject of an ongoing Feasibility Study which is expected to be published in the H1 2023 and may show a change in production targets. Nasdaq: PLL ASX: PLL PIEDMONT LITHIUM#29LiOH 29 29 PIEDMONT LITHIUM LITHIUM-MADE IN THE USA Helping Secure America's Energy Security Macquarie Australia Conference May 2023 Patrick H. Brindle - EVP and Chief Operating Officer +1 412 818 0376 [email protected] Nasdaq :PLL ASX :PLL ARBN 647 286 360 Corporate Office | 42 E. Catawba Street | Suite 100 | Belmont | NC 28012 | USA Australia Office | 28 The Esplanade | 9th Floor | Perth | WA 6000 | Australia www.piedmontlithium.com