Silicon Anode /98 The electrochemical reaction: >Si+4.4Li LiSi(fully lithiated state,each silicon atom can host 4.4 lithium atoms) Reversible process (lithiation/delithiation) >Lit ions insert into silicon and form Li-Si alloy(charge) Si→Li2.oSi→Li3sSi→Li44Si >Then deinsert from silicon and Li-Si dealloy (discharge) Li4,4Si→Li3sSi→Li2.oSi→Si 55 Silicon Anode • The electrochemical reaction: Si + 4.4Li+ ↔ Li4.4Si (fully lithiated state, each silicon atom can host 4.4 lithium atoms) • Reversible process (lithiation/delithiation) Li+ ions insert into silicon and form Li-Si alloy(charge) Si → Li2.0Si → Li3.5Si → Li4.4Si Then deinsert from silicon and Li-Si dealloy (discharge) Li4.4Si → Li3.5Si → Li2.0Si → Si