High-performance self-supporting CuS/SnS2 lithium battery anode material
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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/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%。Abstract: 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/SnS2 lithium battery anode material was designed and prepared. The conductive carbon cloth was used as the substrate to grow and clad CuS/SnS2 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/SnS2 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%.
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Key words:
- transition metal sulfide /
- CuS/SnS2 /
- nanostructures /
- anode material /
- lithium-ion batterie
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图 6 SnS2和CuS/SnS2负极材料的电化学性能
Figure 6. Electrochemical performance of SnS2 and CuS/SnS2 anode materials ((a) Cyclic voltammetric curve of 5% CuS/SnS2 (Scanning rate=0.1 mV/s); (b) Charge and discharge curve (Scanning rate=0.1 mV/s); (c) Charge and discharge curve (Scanning rate=0.1 mV/s); (d) Rate capability test under different current density; (e) Cycle performance (0.2 A/g))
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