▎ 摘　　要

As a promising alternative for next-generation energy storge devices, lithium-sulfur batteries suffer from polysulfide shuttle and the inherent slow kinetics under long- term operating and high mass loading which mainly cause by the absence of available immobilizer and conversion mediators. Herein, La2O3 nanoparticles anchored on graphene composite is designed and demonstrates a high-performance sulfur immobilizer and conversion promoter. Benefiting from the composite, the corresponding Li-S batteries display good cycling stability (capacity fading rate 0.051 % per cycle after 500 cycles), high initial specific capacity (1423.7 mA h g(-1) at 0.2 A g(-1)), and excellent cycling performance at high sulfur loading (5.03 mg cm(-2)). The results of experiments and density functional theoretical (DFT) calculations revealed that the La2O3 nanoparticles is a desirable separator modification material that can effectively tuning the absorption and conversion interactions with polysulfides through S-La and Li-O chemical bonds.