高度阳极的元素选,以提高离子电池的存性能
Wenwu Li1, Jeng-Han Wang2, Yanhong Li1,3
1School of Chemical Engineering, Sungkyunkwan University, 2066 Seoburo, Jangan-gu, Suwon 440-746, Republic of Korea.
Journal of the American Chemical Society
|July 26, 2024
概括
研究人员开发了一种新方法来选先进的离子电池 (LIB) 的高性阳极. 酸 (InZnSiP3) 显示出极好的稳定性和容量,为提高电池性能铺平了道路.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 高性阳极为离子电池 (LIB) 提供了增强的导电性和体积稳定性.
- 这些材料的元素选是复杂的,并阻碍了开发.
- 由于其金属导电性,Sphalerite结构的SiP被确定为一个有前途的母相.
研究的目的:
- 为高性阳极建立一个系统的元素选策略.
- 确定具有优越离子储存能力的新基化合物.
- 了解组合,结构和电化学性能之间的关系.
主要方法:
- 受到球石和钻石结构相似性的启发,以球石结构的SiP作为母相.
- 进行了系统的兴奋剂和替代剂,以探索高化合物.
- 评估了电化学性能,包括容量,循环稳定性和速度能力.
主要成果:
- 将 (Zn) 纳入球石结构提高了稳定性和储存能力.
- 在 BZnSiP3 < AlZnSiP3 < GaZnSiP3 < InZnSiP3 系列中,离子储存性能随原子数增加.
- InZnSiP3电极表现出高容量 (719 mAh g-1在1,500个循环后) 和速率能力 (725 mAh g-1在10,000 mA g-1).
- 较大的原子半径元素增强了晶格扭曲和缺陷,促进了运输.
- 合成的高化合物如GaCuSnInZnSiP6和InZnSiPSeTe的性能和金属导电性得到改善.
- 由于度升高的负形成能量解释了相形成机制.
结论:
- 一种基于结构类比和组成趋势的合理元素选方法得到了成功开发.
- 在ZnSiP3和其他新型高基化合物中显示出高级LIB阳极的显著潜力.
- 这些发现为设计高性能储能材料提供了途径.
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