Solid Power SPAC Presentation Deck

The Industry Leaders are Pursuing a Sulfide-Based Solution Competing electrolyte material pathways to enable All-Solid-State Conductivity Manufacturability Thermal Stability Li Metal Compatibility Moisture Stability Representative Companies Source: Solid Power estimates. Solid Power | DCRC Polymer O ● ● O BOLLORÉ ionic MATERIALS QHydro-Québec Oxide O O ● Quantum Scape AGC ion Storage Systems ProLogium NGK Sulfide Solid Power TOYOTA HYUNDAI MITSUI KINZOKU SAMSUNG idemitsu GLG Panasonic Compelling Market Opportunity ▪ Small temperature performance range requiring additional heating ■ Flexible and elastic Easy to process ■ Polymer " Stable up to 120 °C May require pack-level cooling ▪ Does not only conduct Li ions which complicates Li plating ▪ Use water-reactive salts ■ Commentary Oxide Rigid and brittle Ceramics require complex and hard to scale sintering ▪ Not practical for catholyte Conductivity an order of magnitude lower than sulfide ■ ▪ Stable up to 500+ °C Chemically stable but dendrite prevention is a challenge Requires surface coatings and/ or moisture free processing ▪ Degradation hurts performance, but no safety hazards ■ I ■ ■ Sulfide ▪ Stable up to 450 °C ■ Highest ionic conductivity; comparable to liquid electrolytes ■ Compressible at room temperature Easy to process Moisture exposure forms H₂S Bare-powder concern; easily- controlled in manufacturing ▪ Limited reactivity in cells Composition must be designed to create stable passivating interface with Li metal Sulfides offer the best balance of performance and mass production 20

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