二硫化钼对锂硫电池正极材料性能的影响机理  

Influence mechanism of molybdenum disulfide on performance of cathode materials for lithium sulfur batteries

作　　者：崔春娟[1,2] 刘艳云 刘跃 来园园 王丛 刘薇 胡平[1] 魏剑[1,3] CUI Chunjuan;LIU Yanyun;LIU Yue;LAI Yuanyuan;WANG Cong;LIU Wei;HU Ping;WEI Jian(School of Metallurgical Engineering, Xi'an University of Architecture and Technology,Xi'an 710055, China;Shaanxi Metallurgical Engineering Technology Research Center, Xi'an 710055, China;School of Materials Science and Engineering, Xi'an University of Architecture and Technology,Xi'an 710055, China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055 [2]陕西省冶金工程技术研究中心,西安710055 [3]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《功能材料》2021年第1期1039-1046,共8页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51201121);陕西省重点研发计划重点产业创新链(群)资助项目(2019ZDLGY04-04)。

摘　　要：炭黑具有良好的导电性、价格较低、来源稳定、可大量制备等优点,可有效提高硫正极材料的导电性,改善电极的动力学性能。二维层状结构的二硫化钼(MoS2)因其含有的金属-硫键可以与多硫化物通过静电作用或化学键作用结合,从而可以有效地抑制锂硫电池存在的穿梭效应,提高锂硫电池的倍率性能。本文采用球磨法和水热法制备了硫/炭黑复合材料以及类石榴状硫/炭黑/层状MoS2复合正极材料,并研究了该复合正极材料的性能。研究结果表明,硫/炭黑/层状MoS2复合正极材料有效提高了电池的比容量,改善了电池的倍率性能和循环稳定性。在0.2 A/g倍率下,初始放电容量可达767.9 mAh/g。Carbon black has the advantages of good electrical conductivity,low price,stable source and mass quantities of production.It can effectively improve the conductivity of sulfur-based cathode materials,the dynamic performance of electrodes and the rate performance of lithium sulfur batteries.Molybdenum disulfide(MoS2)contains metal-sulfur bonds,which can combine with polysulfide by electrostatic or chemical bonds,so two-dimensional layered MoS2 can effectively inhibit the shuttle effect of lithium-sulfur batteries.In this paper,sulfur/carbon black composites and pomegranate-like sulfur/carbon black/layer MoS2 composite cathode materials were prepared by ball milling and hydrothermal method,and the properties of the composite cathode materials were studied.The results show that sulfur/carbon black/layer MoS2 composite cathode material could effectively increase the specific capacity of the batteries,improving the rate performance and cycle stability of the batteries.The initial capacity could reach 767.9 mAh/g at 0.2 A/g.

关 键 词：锂硫电池 正极 MOS2 复合材料 

分 类 号：TM911[电气工程—电力电子与电力传动]