Self-crystallized Interlayer Integrating Polysulfide-adsorbed TiO2/TiO and Highly-electron-conductive TiO for High-stability Lithium-sulfur Batteries

Authors：Yang, Xinzhe; Qin, Tingting; Zhang, Xiaoyu; Liu, Xiaofei; Wang, Zizhun; Zhang, Wei^*; Zheng, Weitao^*

Source：CHEMICAL RESEARCH IN CHINESE UNIVERSITIES, 2021, 37(2): 259-264.

DOI：10.1007/s40242-020-0310-0

• Lithium sulfur battery
• TiO2/TiO
• Carbon fiber paper

Low-cost lithium sulfur(Li-S) batteries afford preeminent prospect as a next-generation high-energy storage device by virtue of great theoretical capacity. Nevertheless, their applications are restricted by some challenging technical barriers, such as weak cycling stability and low poor-conductivity sulfur loading originated in notorious shuttling effect of polysulfide intermediates. Herein, free of any complicated compositing process, we design an interlayer of carbon fiber paper supported TiO2/TiO to impede the shuttle effect and enhance the electrical conductivity via physical isolation and chemical adsorption. Such a self-crystallized homogeneous interlayer, where TiO2/TiO enables absorbing lithium polysulfides(LiPSs) and TiO plays a key role of high-electron-conductivity exhibited ultrahigh capacities(1000 mA center dot h/g at 0.5 C and 900 mA center dot h/g at 1 C) and outstanding capacity retention rate(97%) after 100 cycles. Thus, our design provides a simple route to suppress the shuttle effect via self-derived evolution Li-S batteries.

• Institution
  吉林大学; 华中科技大学