SiO2 coated carbon interlayer for Li-S batteries

Lithium-sulfur batteries have received great attention because of the high theoretical specific capacity, natural abundance, low cost, and environmental friendliness sulfur. However, poor cycling C-rate performance limit application Li-sulfur batteries. Placing porous highly conductive interlayer between separators sulfur cathodes is an efficient approach to improve active materials’ utilization polysulfide shuttle effect thus enhance electrochemical properties cells. Moreover, SiO2 could further via capturing large amount polysulfides owing polar structure strong chemical interactions. coated carbon nanofibers were prepared used as in The uniform coating nanoparticles on observed from SEM TEM images. cells with nanofiber (SiO2@CNF) interlayers delivered first discharge capacity 1547 mAh/g retained around 916 200 cycles at 0.2C. SiO2@CNF also showed improved compared without interlayers. enhanced resulted not only ability surface area but interconnected nanofibers. Highly led adsorption reutilization adsorbed thereby reversible capacities.