FeS2 microsphere as cathode material for rechargeable lithium batteries

Yiming Tao, Kun Rui, Zhaoyin Wen, Qingsong Wang, Jun Jin, Tao Zhang, Tian Wu

科研成果: 期刊稿件文章同行评审

22 引用 (Scopus)

摘要

The spherical pyrite FeS2 was synthesized through a green and simple method with the addition of the polyvinylpyrrolidone (PVP) dispersant. The as-prepared FeS2 displays a good electrochemical performance with an initial specific capacity over 80% of the theoretical value and a very low decay rate of 0.33% per cycle (calculated from 2nd to 50th at 0.1 C). Rate capability testing exhibits discharge capacities of around 371.6 mAh/g (0.1 C), 343 mAh/g (0.2 C), 294.9 mAh/g (0.5 C), 239 mAh/g (1 C) and 161.8 mAh/g (2 C) respectively. Besides, coulombic efficiency close to 100% at various rates can also be obtained. We calculate Li+ diffusion coefficient and multi-electron feature of the pyrite FeS2 during charge/discharge process. It shows that smaller potential window is beneficial for cyclability, which was in good agreement with experimental results.

源语言英语
页(从-至)47-52
页数6
期刊Solid State Ionics
290
DOI
出版状态已出版 - 1 7月 2016
已对外发布

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