Study on Fabrication and Electrochemical Performances of Fe<sub>7</sub>S<sub>8</sub>@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.