Hierarchically constructed TiO2 spheres as efficient polysulfide barrier for high-performance Li-S battery

Abstract

Lithium-Sulfur batteries are the most promising candidates for the next energy storage system. Many reports have been reported for improving the cycle performances of Li-S battery, such as designing cathode host material, employing functionalized interlayer between the cathode and separator and developing suitable electrolyte. In this work, novel hierarchically constructed TiO2 spheres are prepared and used host materials for sulfur cathode. This novel structure of TiO2 spheres serves as the host material, which could efficiently stabilize the polysulfide at the cathode side. As a result, the shuttle effect of polysulfide in the Li-S battery is greatly alleviated via the hierarchically constructed TiO2 spheres. Finally, the TiO2/S composites display excellent cycle stability and superior rate performance.