石墨烯
多硫化物
材料科学
纳米颗粒
纳米技术
硫黄
复合数
分离器(采油)
化学工程
化学
电极
复合材料
物理化学
热力学
电解质
物理
工程类
冶金
作者
Yiding Li,Kai Sun,Pu Cheng,Jianjun Li,Dequan Liu,Deyan He
标识
DOI:10.1002/slct.202104328
摘要
Abstract 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, La 2 O 3 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 La 2 O 3 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.
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