National Engineering Laboratory for Hydro metallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100864 , China.
University of Chinese Academy of Sciences , No.19A Yuquan Road , Beijing 100049 , China.
ACS Appl Mater Interfaces. 2018 May 16;10(19):16552-16560. doi: 10.1021/acsami.8b03201. Epub 2018 May 1.
The high theoretical energy density of lithium-sulfur (Li-S) batteries makes them an alternative battery technology to lithium ion batteries. However, Li-S batteries suffer from low sulfur loading, poor charge transport, and dissolution of lithium polysulfide. In our study, we use the lithiated S, LiS, as the cathode material, coupled with electrospun TiO-impregnated hollow carbon nanofibers (TiO-HCFs), which serve as the conductive agent and protective barrier for LiS in Li-S batteries. TiO-HCFs provide much improved electron/ionic conductivity and serve as a physical barrier, which prevents the dissolution of lithium polysulfides. The LiS/TiO-HCF composite delivers a discharge capacity of 851 mA h g at 0.1C and the bilayer TiO-HCFs/LiS/TiO-HCF composite delivers a high specific capacity of 400 mA h g at 5C.
锂硫（Li-S）电池具有较高的理论能量密度，使其成为锂离子电池的替代品。然而，Li-S 电池存在硫载量低、电荷传输性能差以及多硫化锂溶解等问题。在我们的研究中，我们使用锂化硫（LiS）作为正极材料，并与静电纺丝 TiO 浸渍的中空碳纳米纤维（TiO-HCFs）结合，TiO-HCFs 既可用作 Li-S 电池中 LiS 的导电剂和保护屏障。TiO-HCFs 提供了极大改善的电子/离子导电性，并起到物理屏障的作用，防止多硫化锂溶解。LiS/TiO-HCF 复合材料在 0.1C 时的放电容量为 851 mA h g，而双层 TiO-HCFs/LiS/TiO-HCF 复合材料在 5C 时的比容量高达 400 mA h g。
