Solid Power SPAC Presentation Deck

Proven MWh-Scale Prototype Production Line Nearly identical production process to lithium-ion; future lithium-ion process improvements expected to be transferable Electrode manufacturing Assembly Conditioning XX AA Slurry Mix 000 Stamping Pre- Formation Slot Die Coating Solid Power DCRC anode seperator cathode Stacking Source: Adapted from Bloomberg NEF. ttt Drying Consolidation Weld Electrode Calendaring / Slitting Lamination Packaging Filling Aging Degassing Formation Final Storage Lithium-ion process steps removed in solid-state production + Solid Power Characterization & QC Products and Technology ▪ Since inception, compatibility with lithium-ion manufacturing processes has been fundamental to Solid Power's strategy, driving the selection of a sulfide-based solution and subsequent R&D ■ Utilizes industry standard lithium-ion production processes and equipment · - Substantially de-risks commercial success Allows for rapid deployment of technology among early adopter platforms Existing production lines can be transitioned as market demand grows (est. at 10% of cost of new plant) Minimal historical and future capex requirements to prove commercialization Existing lithium-ion production infrastructure accommodates sulfide solid electrolyte moisture sensitivity ▪ Solid Power's process eliminates electrolyte filling and formation cycling, which account for approximately 5% and 30% of capex in typical GWh-scale lithium-ion facility, respectively Removing 1.5 to 3-week formation process further improves Solid Power throughput Roll-to-roll production line will have successfully produced 0.2 Ah, 2 Ah and 20 Ah form factors and Li Metal and Si anode cells by end of 2021 Production line can be easily transitioned between Li Metal and Si anode cells Solid Power is positioned to deliver superior cells at scale 29

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