用于离子电池的高容量SnS阳极及其在以太和电解质中的特征
Hui Wang1, Yanan Sun1,2, Thorsten Schultz3,4
1Department of Chemistry, Humboldt University of Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany.
Small (Weinheim an der Bergstrasse, Germany)
|August 26, 2025
概括
硫化 (SnS) 复合物与热激活石墨 (t-G) 显著提高离子电池阳极性能. 这些SnS-t-G阳极具有较高的体积容量和更长的周期寿命,性能优于传统的硬碳阳极.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 硬碳 (HC) 阳极的低体积能量密度限制了离子 (Na-ion) 电池的发展.
- 需要高密度,高容量的材料来克服这一局限性.
- 硫化 (SnS) 通过转化和合金反应提供1022 mAh g-1和5335 mAh cc-1.
研究的目的:
- 使用基于SnS的复合材料开发用于Na-ion电池的高性能阳极.
- 研究热激活石墨 (t-G) 添加对SnS阳极性能的影响.
- 评估电解质类型对SnS阳极电化学行为的影响.
主要方法:
- 通过球磨来制备SnS和t-G复合材料.
- 在不同的电解质溶液中对复合阳极进行电化学测试 (以基或以基).
- 在现场分析,使用操作式X射线衍射和扩散测量来研究反应机制.
主要成果:
- 将5%的t-G添加到SnS可以显著提高容量和循环寿命,最初达到608mAhg-1和100个循环后达到439mAhg-1.
- 即使没有日历,SnS-t-G电极的体积容量为283 mAh cc-1 (电极水平),与商业HC阳极相美.
- 与以为基础的电解质相比,以为基础的电解质具有更高的性能,使得储存能力更高,循环寿命更长.
结论:
- SnS-t-G复合材料是高体积密度离子电池的一个有前途的阳极材料.
- 以为基础的电解质对于释放SnS阳极的全部潜力至关重要,特别是在0V附近的合金反应中.
- 这项研究阐明了反应机制,强调了合金反应在循环过程中对转化反应的可逆性.
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