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

摘要

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·h/g at 0.5 C and 900 mA·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.