Solid Power SPAC Presentation Deck

High-Content Silicon Anode Battery Roadmap Improvements in cell-level energy achieved through well-defined cell design optimization plan Anode Current Collector Anode Cathode Cathode Current Collector High-Content Silicon Solid Electrolyte NMC811 Anode Composite Anolyte Electrolyte 000 ●●● Conductive Carbon Active Material Catholyte Binder Pre A-Sample 320 Wh / kg, 740 Wh / L¹ Pouch Energy Density 2C Room temperature max charge rate Today Note: All energy densities based on volumes of fully-charged cells. Refer to slide 49 for definitions of Sample stages. 1. Projected to 100 Ah cell based on cell stack-level values 340 Wh/kg and 900 Wh / L. Solid Power DCRC A-Sample Target Commercialization Roadmap 340 Wh / kg, 770 Wh / L Pouch Energy Density 3C Room temperature max charge rate ✓ Increase footprint and number of layers Decrease stack pressure requirement ✓Match small pouch cell performance on higher throughput 100 Ah cell pilot line ✓ Minimize resistance within layers Key Design Optimizations (Pre-A Sample to A-Sample) B-Sample Target 390 Wh / kg, 930 Wh / L Pouch Energy Density Room temperature max charge rate Key Design Optimizations (A-Sample to B-Sample) Increase mAh /cm² 3C+ ✓ Decrease separator thickness ✓ Increase cathode specific capacity Commercial Design Freeze 36

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