C/Si Composite Anodes for Advanced Lithium Ion Batteries

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Hard d( (non-graphitizable)Carbon vs Graphites• Higher specific capacity and better chargeacceptance• Lower energy density• Better cycle life, less volume change and morestable SEI layer• Higher irreversible capacity due to surface groupsand water adsorption• Higher surface area leading to increased SEIformation• Hydrogen incorporation causes cycling hysterisisTDAR e s e a r c h
Synopsis of Work EffortThere were three major factors studied:(1) Composites fired at differenttemperatures (> 1200 C or 1000 C)(2) Composites made with nano Si versus44 um Si particle sizes(3) Composites using different carbonsourcesTDAR e s e a r c h
Page 1 and 2: NASA Battery WorkshopHuntsville, AL
Page 3 and 4: TDA Research, Inc.www.tda.comWheat
Page 5 and 6: History of Commercial SuccessTDA’
Page 7 and 8: Engineered Pore-SizeOptimizes Perfo
Page 9 and 10: Silicon as an Anode• 4200 mAh/g c
Page 11: Si/C Composites+ xLi+-xLi +SiLi x S
Page 15 and 16: Started with Control CarbonsFired a
Page 17 and 18: Process Conditions Changed toReduce
Page 19 and 20: Initial Si-nano Controls AlsoShowed
Page 21 and 22: Dispersion of NanoSi Resultedin The
Page 23 and 24: Carbon Stabilized Si CapacityCapaci
Page 25 and 26: Type 2 Carbon Has BetterCapacity Fa
Page 27 and 28: Power is Dependent onLoading Level
Page 29 and 30: Cycle Life Will Be Focus ofFuture E
Page 31 and 32: Economic Analysis FavorsLarger Part
Page 33: Thanks to NASA JSC for FundingNASA

C/Si Composite Anodes for Advanced Lithium Ion Batteries

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