In-Situ Preparation of Si@C Composite Anode Materials for Lithium Ion Batteries

Abstract

A Si@C nanocomposite material is prepared via in-situ polymerization of acrylonitrile on the surface of silicon nanoparticles,and followed by carbonization in an inert atmosphere. The obtained Si@C nanocomposite material is composed of a nanosized Si core anda casting carbon shell. Its structure and electrochemical properties are characterized by XRD, TG, Raman, SEM, TEM and chargedischargeperformance test. The results obtained in this study show that Si@C nanocomposite is coated by a layer of amorphous carbonwhich provides a conductive matrix and relieves the dramatically morphological changes of Si upon lithium insertion and extraction. Thecomposite exhibits good capacity retention for use as anode in lithium-ion batteries. This study also paves a facile and industrial scalableway to prepare core/shell structure for high performance anode materials for lithium-ion batteries.