Interfacial structural stabilization on amorphous silicon anode for improved cycling performance in lithium-ion batteries

摘要: Interfacial structures of electrode–current collector and electrode–electrolyte have been designed to be stabilized for improved cycling performance amorphous silicon (Si) that is considered as an alternative anode material graphite lithium-ion batteries. structural stabilization involves the interdigitation Si electrode–Cu current substrate by anodic Cu etching with thiol-induced self-assembly, formation self-assembled siloxane on surface electrode using silane. The novel interfacial architecture possesses promoted contact area between Cu, a protective layer suppresses reactions electrolyte 1 M LiPF6/ethylene carbonate (EC):diethylene carbondate (DEC). FTIR spectroscopic analyses revealed stable solid interphase (SEI) composed lithium carbonate, organic compounds carboxylate metal salt ester functionalities, PF-containing species formed when having electrode. Interfacially exhibited high capacity retention 80% maximum discharge after 200 cycles 0.1 1.5 V vs. Li/Li+. data contribute basic understanding causes responsible Si-based alloy anodes in