高性能自支撑CuS/SnS2锂电池负极材料

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/SnS₂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/SnS₂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/SnS₂负极材料电化学性能的影响，最佳配比的CuS/SnS₂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%。 

High-performance self-supporting CuS/SnS lithium battery anode material

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/SnS₂lithium battery anode material was designed and prepared.The conductive carbon cloth was used as the substrate to grow and clad CuS/SnS₂hollow 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/SnS₂anode material is 1480 mAh·g^-1at 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%.