Double Locked Silver-coated Silicon Nanoparticle/Graphene Core/Shell Fiber for High-Performance Lithium-Ion Battery Anodes

Abstract

We present a fabrication of a scalable coaxial core/shell silicon-graphene fiber prepared by dual-nozzle-induced wet-spinning assembly for high-performance silicon anode. Over 50 wt% of silicon nanoparticles mixed with graphene oxide suspension can be incorporated in the core with using outstanding dispersive property of unique silver-coated silicon nanoparticles in aqueous media. This core fiber is further encapsulated by graphene shell which not only provides conducting pathways, but also alleviates severe volume expansion of silicon core. This novel core/shell silicon anode double locked with graphene architecture delivers more stable cycle performance and superior rate capability than anodes composed of simple mixture of silicon-graphene composites.