高比容量锂硫电池复合正极材料

doi:10.3969/j.issn.2095-4239.2014.04.008

摘要/Abstract

摘要： Li与S完全反应生成Li₂S时,单质硫正极的理论比容量为1675 mA·h/g,比LiFePO₄,LiCoO₂等正极材料的比容量高很多.单质S价格低,无毒,是一种理想的正极材料,然而其导电性较低,循环比容量衰减较快,因此需要改善S正极材料的导电性来提高其电化学性能.本文综述了硫基复合正极材料的制备方法,结构与形貌,电化学性能.探讨了S与多孔碳,碳纳米管,石墨烯和聚吡咯等复合的正极材料的电化学性能,并对硫基正极材料的发展趋势进行了展望.

关键词: 锂硫电池, 硫基复合材料, 正极, 充放电性能

Abstract: Because the complete reaction product of lithium and sulfur is Li₂S, the theoretic capacity of elemental sulfur cathode in a lithium sulfur battery is 1675mA·h/g, which is much higher than other cathode materials of LiFePO₄, LiCoO₂, et al. And sulfur has low price and non-toxic, which is an ideal cathode material. However, its electrical conductivity is very low, and the capacity declines rapidly with cycling. So it is necessary to improve the conductive performance of sulfur cathode and enhance its electrochemical properties. In this paper, the preparation method, structure and morphology, electrochemical properties of sulfur-based composite cathode materials are reviewed. The combination of sulfur with mesoporous carbon, CNTs graphene and polypyrrole respectively is discussed, and the future prospect of sulfur-based cathode material is also represented.

Key words: lithium/sulfur battery, composite materials, cathode, charge-discharge property

中图分类号:

TM911

郭锦, 张敏刚, 闫时建, 孙钢. 高比容量锂硫电池复合正极材料[J]. 储能科学与技术, 2014, 3(4): 345-352.

GUO Jin, ZHANG Mingang, YAN Shijian, SUN Gang. High specific capacity composite cathode materials for lithium-sulfur batteries[J]. Energy Storage Science and Technology, 2014, 3(4): 345-352.

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