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Mo and N co-doped integrated membrane electrode in lithium sulfur batteries

Authors： JIANG Fulin, LI Xiangcun, CHU Zhong, JIANG Xiaobin, XIAO Wu, WU Xuemei, HE Gaohong

Units： State Key Laboratory of Fine Chemicals, Research Center of Membrane Science & Technology, Dalian University of Technology, Dalian 116024, Liaoning, China

KeyWords： phase inversion method; integrated membrane electrode; catalysis; three-dimensional conductive network; lithium sulfur batteries

ClassificationCode：TQ152

year,volume(issue):pagination： 2021,41(5):1-10

Abstract：

In order to simplify the structure of batteries and improve the performance of batteries, the integrated membrane of electrode membrane-interlayer was constructed by phase inversion method, and the MoNCNTs/CNTs-PAN was further prepared by doping Mo elemental substance. The Mo and N co-doped cathode membrane can adsorb and catalyze the transformation of polysulfide, effectively inhibiting the "shuttle effect". The interlocking three-dimensional porous network and good pore structure in the membrane can enhance the electrical conductivity and effectively buffer the volume expansion of the active material. The integrated membrane electrode shows excellent electrochemical performance, with a discharge specific capacity of 927.2 mA h/g and a coulomb efficiency of 98.9 % at a low sulfur load at 0.5 C after 100 cycles, even at a high sulfur loading of 4.0 mg/cm2, a discharge specific capacity of 530.1 mA h/g can be maintained at 0.2 C after 100 cycles, the average capacity decay rate per cycle is only 0.09 %. The results show that the integrated membrane has a good application prospect in lithium-sulfur batteries.

Funds：

国家自然科学基金(21676043，21506028，21706023)；大连市科创基金(2019J12SN68)

AuthorIntro：

姜福林(1995-), 男，山东烟台人，硕士，研究方向为锂硫电池电极及隔层材料

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