膜科学与技术

Mo和N共掺杂的一体化膜电极用于锂硫电池

作者：姜福林，李祥村，初众，姜晓滨，肖武，吴雪梅，贺高红

单位：大连理工大学精细化工国家重点实验室，膜科学与技术研究开发中心，辽宁大连 116024

关键词：相转化法；一体化膜电极；催化作用；三维导电网络；锂硫电池

出版年,卷(期):页码： 2021,41(5):1-10

摘要：

采用相转化法构建了电极膜-隔膜一体化膜，并进一步通过Mo单质的掺杂制得MoNCNTs/CNTs-PAN，用以简化电池结构，提升电池性能。Mo、N共掺杂的正极膜层可以吸附并催化多硫化物转化，有效抑制“穿梭效应”。膜层内部交错的三维多孔网络和良好的孔隙结构，在增强导电性的同时能有效缓冲活性物质的体积膨胀。一体化膜电极应用于锂硫电池时表现出优异的电化学性能，在较低载硫量0.6-0.8mg/cm2时，在0.5 C电流密度下经过100圈循环后放电比容量为927.2 mA h/g，库伦效率为98.9 %，在高载硫量4.0 mg/cm2时，在0.2 C电流密度下经过100圈循环后仍保持530.1 mA h/g的放电比容量，平均每圈容量衰减率仅为0.09 %。结果表明，一体化膜在锂硫电池中具有良好的应用前景。

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.

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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