Hierarchically Constructed TiO₂ Spheres as Efficient Polysulfide Barrier for High-Performance Li-S Battery

摘要

Lithium-Sulfur batteries are the most promising candidates for the next energy storage system. Manyreports have been reported for improving the cycle performances of Li-S battery, such as designingcathode host material, employing functionalized interlayer between the cathode and separator anddeveloping suitable electrolyte. In this work, novel hierarchically constructed TiO 2 spheres areprepared and used host materials for sulfur cathode. This novel structure of TiO 2 spheres serves as thehost material, which could efficiently stabilize the polysulfide at the cathode side. As a result, theshuttle effect of polysulfide in the Li-S battery is greatly alleviated via the hierarchically constructedTiO 2 spheres. Finally, the TiO 2 /S composites display excellent cycle stability and superior rateperformance.