Study on Fabrication and Electrochemical Performances of Fe₇S₈@C Composite Materials

Abstract

Fe₇S₈@C composite materials are facilely fabricated using the gelatin, FeSO₄·7H₂O and Na₂S·9H₂O by one-step method. The obtained Fe₇S₈@C composite materials show the fabulous rate performances and cycling performances, when controlling the carbon contents in Fe₇S₈@C composite materials. For instance, the Fe₇S₈@C-40 shows the cycling performance at 657.3 mAh/g, after carrying out the charge-discharge cycles 400 times. These electrochemical performances lead us to consider our provided preparation method is the effective way to facilitate the application of Fe₇S₈@C in fabrication of lithium ion batteries (LIBs) as negative electrode materials.