多硫化物
材料科学
阴极
硫黄
碳化
电池(电)
化学工程
碳纤维
复合数
电导率
储能
锂硫电池
纳米技术
电解质
复合材料
电极
化学
冶金
物理化学
扫描电子显微镜
功率(物理)
物理
量子力学
工程类
作者
Qianqian Wu,Tianbao Yan,Kunming Li,Xuepeng Ni,Fang Zeng,Anqi Ju
标识
DOI:10.1016/j.jmat.2022.07.003
摘要
Lithium-sulfur (LiS) batteries are considered as one of the most promising high-energy storage devices due to the high theoretical capacity (1675 mA·h·g−1) and large energy density (2600 W·h·kg−1). However, the poor conductivity of sulfur and “shuttle effect” of soluble polysulfide intermediates limit practical applications of LiS batteries. Herein, four kinds of carbon sub-micro fibers with different structures were designed and prepared, the effect of structure on LiS battery was studied. On this basis, the XO (X = Ti, Mn) decorated hollow multi-channel carbon sub-micro carbon fibers (HMCMFs) were prepared by electrospinning and carbonization. The HMCMFs can not only supply nanopores for relieving the expansion of sulfur but also served as high conductivity freestanding substrate for sulfur loading, meanwhile the decorated XO (X = Ti, Mn) can provide powerful chemical adsorption to polysulfide intermediates and limit “shuttle effect” Therefore, the TiO-HMCMFs/S composite shows high specific capacity of 900 mA·h·g−1 and maintain stable specific capacities up to ∼600 mA·h·g−1 over 300 cycles at 0.1 A·g−1. This work offers a facile method to build efficient sulfur cathode to acquire LiS batteries with high performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI