Enovix SPAC Presentation Deck
Four Killer Problems Faced Silicon
Anodes
1. First charge
expansion
2. First charge
efficiency
3. Cycle
swelling
4. Cycle life
16
Conventional Graphite Anode¹
LOW
Anode material only expands -10%
HIGH (90-95%)
Low loss of Li trapped in anode material
LOW (<10%)
Stable anode electrode thickness
HIGH (>500 cycles)
Stable structure
Low Li trapping loss
Conventional Silicon Anode Problems
HIGH
Silicon anodes expand by over 2x when charged
LOW (50-60%)
About half the Li is permanently trapped in silicon
anode²
HIGH (>20%)
Anode repeatedly swells and shrinks battery during cycling
LOW (<100 cycles)
Silicon particles electrically disconnect & even crack
¹Including graphite + 5% silicon anodes.
2On LCO-Silicon cells discharged to 2.7V
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