MoO_(2)/ZnS复合材料改性隔膜实现锂硫电池稳定的高倍率性能  

MoO_(2)/ZnS composites material modified separator achieves stable high rate performance of Li-S battery

作　　者：许占位[1] 郭隆华 任宇川 赵家棋 李嘉胤[1] 李亮 马维鹏 张科[1] XU Zhan-wei;GUO Long-hua;REN Yu-chuan;ZHAO Jia-qi;LI Jia-yin;LI Liang;MA Wei-peng;ZHANG Ke(School of Material Science and Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报》2024年第6期112-118,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(52073166);陕西省自然科学基金项目(2023-JC-YB-302)。

摘　　要：锂硫电池由于其高能量密度、低成本效益被认为是最有前途的下一代电池体系之一.然而多硫化物的穿梭效应大幅降低了锂硫电池的循环稳定性和寿命,严重阻碍其实际应用.无机金属化合物材料改性的隔膜不仅能抑制多硫化锂(LiPS)的穿梭效应,其部分特殊的晶面还能加速多硫化物的氧化还原反应动力学.本文在罗盘状ZnS表面原位生长球状的MoO_(2),制备MoO_(2)/ZnS复合材料.MoO_(2)对多硫化物有着较强的吸附作用,ZnS有着良好的电导率,两者的复合可加速电子传导效率和氧化还原速率.以所制备的MoO_(2)/ZnS作为隔膜改性材料,锂硫电池在5 C的大电流密度下,经过1000次循环后仍可以保持690 mAh g^(-1)的放电比容量,平均每圈的容量衰减率仅为0.014%,表现出优异的循环性能和倍率性能.Lithium-sulfur batteries are considered as one of the most promising next-generation rechargeable batteries due to their high energy density and cost-effectiveness.However,the shuttle effect of polysulfides significantly decreases the cycle life and stability of Li-S batteries,hindering their practical applications.The separator modified by inorganic metal compound materials can not only inhibit the shuttle effect of polysulfides,some of its special crystal planes can also accelerate the redox reaction kinetics of polysulfides.In this paper,the MoO_(2)/ZnS nanocomposites were synthesized by growing spherical MoO_(2)on the surface of compass-shaped ZnS.MoO_(2)possesses strong adsorption effect towards polysulfides and ZnS exhibits excellent electronic conductivity,accelerating the electron conduction efficiency and redox rate.The cell with MoO_(2)/ZnS separator exhibits a high specific capacity of 690 mAh g-1.At a high current density of 5 C,the discharge specific capacity can still be maintained after 1000 cycles,with an average capacity decay rate of 0.014%,showing excellent cyclic stability and rate performance.

关 键 词：MoO_(2) ZNS 复合材料 穿梭效应 隔膜改性 

分 类 号：TM912[电气工程—电力电子与电力传动]