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 |
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页(从-至) | 47-52 |
页数 | 6 |
期刊 | Solid State Ionics |
卷 | 290 |
DOI | |
出版状态 | 已出版 - 1 7月 2016 |
已对外发布 | 是 |