Electrochemical performance of sulfur-based lithium batteries with free-standing SiO2/C composite nanofiber mat as interlayer

摘要

Sulfur has abundant distribution in nature,low cost,and high theoretical capacity(1675 mAh g-1),which make it attractive cathode material for lithium batteries.However,pure sulfur has low electronic conductivity [1].Another sulfur-based material CuS has a moderate capacity(560 mAh g-1)but functional electronic conductivity.One of the common issues of these materials is the dissolution of polysulfides and the so-called"shuttle effect"[2].Carbonbased nanofibers inserted between cathode and separator could effectively solve this problem and improve the cell performance [3].In this work,we developed a freestanding SiO2/C composite nanofiber mat(FS-SiO2/CCNFM)as a multi-functional interlayer by electrospinning with heat treatments.The effect of the interlayer on the electrochemical properties of lithium batteries was studied using S/C and CuS cathodes.