Silicon/Carbon Composite Anode Materials for Lithium-Ion Batteries

摘要

Silicon(Si)is a representative anode material for next-generation lithium-ion batteries due to properties such as a high theoretical capacity,suitable working voltage,and high natural abundance.However,due to inherently large volume expansions(~ 400%)during insertion/deinsertion processes as well as poor electrical conductivity and unstable solid electrolyte interfaces(SEI)films,Si-based anodes possess serious stability problems,greatly hindering practical application.To resolve these issues,the modification of Si anodes with carbon(C)is a promising method which has been demonstrated to enhance electrical conductivity and material plasticity.In this review,recent researches into Si/C anodes are grouped into categories based on the structural dimension of Si materials,including nanoparticles,nanowires and nanotubes,nanosheets,and porous Si-based materials,and the structural and electrochemical performance of various Si/C composites based on carbon materials with varying structures will be discussed.In addition,the progress and limitations of the design of existing Si/C composite anodes are summarized,and future research perspectives in this field are presented.