Cobalt‐Tungsten Bimetallic Carbide Nanoparticles as Efficient Catalytic Material for High‐Performance Lithium–Sulfur Batteries

• DOI: 10.1002/cssc.201901736
• Publication Date: 2019-08-17T10:39:11Z
• Authors: Pengfei Zhao; Ze Zhang; Haoxuan He; Yinghui Yu; Xiao Li; Weicheng Xie; Zhenyu Yang; Jianxin Cai
• Keywords: Polysulfide; Bimetallic strip; Lithium–sulfur battery; Separator (oil production)

Lithium-sulfur (Li-S) batteries are promising candidates for next-generation energy storage devices owing to their advantages such as high theoretical specific capacity and density. However, the shuttle effect of polysulfide intermediates slow electrochemical kinetics have a severe passive on cycling stability rate performance. A Co3 W3 C@C composite was prepared through simple one-pot pyrolysis method used modifying layer commercial separator. The obtained modified separator not only prevented both strong chemical interaction physical barrier toward polysulfides, but also acted catalytic membrane catalyze redox active sulfur species. By employing coated separator, cathode with 60 wt % delivered initial 1345 mAh g-1 at 0.1 , excellent performance 670 even 7 outstanding cycle low decay 0.06 per an average Coulombic efficiency 99.3 within 500 cycles 1 . Even loading 3 mg cm-1 869 632 after 200 were obtained. results demonstrate Co-W bimetallic carbide in preventing promoting Li-S batteries.