摘要
过渡金属硫化物作为锂电池负极材料具有极高比容量,但其制备的电极普遍存在导电性差、体积变化大等问题,本研究设计了一种新型的自支撑CuS/SnS_(2)镂空片状锂电池负极材料,以导电碳布作为基底,生长包覆CuS/SnS_(2)镂空纳米片,具备特殊的纳米包覆结构及双金属协同效应,使其在保持较高比容量的同时具备良好的循环稳定性,整体电化学性能优异。研究不同Cu/Sn含量对CuS/SnS_(2)负极材料电化学性能的影响,最佳配比的CuS/SnS_(2)负极材料在0.2 A·g^(-1)电流密度下循环50次后比容量为1480 mAh·g^(-1),库伦效率稳定在99.5%,在2 A·g^(-1)电流密度下循环200次后比容量仍能保持在697 mAh·g^(-1),库伦效率为99.8%。
The transition metal sulfide is an extremely high capacity anode material for lithium ion batteries.In this paper,a new kind of hollow out nanosheets lithium battery anode material with self-supporting CuS/SnS_(2)lithium battery anode material was designed and prepared.The conductive carbon cloth was used as the substrate to grow and clad CuS/SnS_(2)hollow out nanosheets.It has high specific capacity,good cycling performance and excellent electrochemical performance.The effects of different Cu/Sn contents on electrochemical properties were investigated.The specific capacity of CuS/SnS_(2)anode material is 1480 mAh·g^(-1)at 99.5%coulomb efficiency after 50 cycles under the current density of 0.2 A·g^(-1).After 200 cycles at the large current density of 2 A·g^(-1),the specific capacity remains at 697 mAh·g^(-1),and the coulomb efficiency is stable at 99.8%.
作者
张鹏
刘洋
陈明华
孙凤莲
ZHANG Peng;LIU Yang;CHEN Minghua;SUN Fenglian(School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150080,China;School of Applied Science,Harbin University of Science and Technology,Harbin 150080,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2021年第3期871-878,共8页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51604090)
黑龙江省自然科学基金资助项目(LH2020E089)。
