Solid Power SPAC Presentation Deck

EUCAR Hazard Levels Cell hazard levels are the outcome of performed safety tests and are classified under the EUCAR Hazard level table Safety levels are <=4 for: HAZARD LEVEL 0 1 2 3 4 5 6 7 DESCRIPTION Solid Power DCRC No effect Passive protection activated Defect/ damage Leakage, a change in mass of less than 50% Venting, a change in mass of more than or equal to 50% Fire or Flame Rupture Explosion Source: European Council for Automotive R&D. CLASSIFICATION CRITERIA & EFFECT No loss of functionality Cell irreversibly damaged and repair needed with no defect, exothermic reaction, thermal runaway or higher level hazards Cell irreversibly damaged and repair needed with no exothermic reaction, thermal runaway or higher level hazards Loss in electrolyte weight of less than than 50% with no higher level hazards Loss in electrolyte weight of more than 50% with no higher level hazards Exothermic reaction or thermal runaway with no rupture or explosion No explosion, but flying parts of the active mass Disintegration of the cell Appendix Current state-of-the-art cells ✓ Target 2023 mass market, low range cells ✓ Target 2030 mass market, high range cells ✓ Target 2030 mass market commercial cells Cells with Hazard levels greater than 4 are a non-starter Deemed hazardous 52

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