揭示了离子电池高层氧化物阴极的滑动诱导的结构扭曲
Dongyan Yu1, Guifan Zeng1, Diancheng Chen2
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
ACS nano
|September 26, 2024
概括
使用过渡金属的多层氧化物阴极在高电荷状态 (SoC) 中稳定结构. 这可以防止耗尽和结构扭曲,增强高容量应用的电池循环稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 固态化学 固态化学
背景情况:
- 层状氧化物阴极提供高容量,但由于深度耗尽,在高电荷状态 (SoC) 时面临结构不稳定.
- 这种耗尽导致滑动引起的扭曲,特别是在高的阴极材料中,限制了它们的实际应用.
研究的目的:
- 确定高SoC形成的有害H3相的结构特征.
- 通过防止空板的形成来稳定分层氧化物阴极的兴奋剂策略.
主要方法:
- 结构分析以确定H3阶段作为O3/O1板块交生.
- 采用了两个兴奋剂策略:直接过渡金属 (TM) 柱和间接柱.
- 电化学性能测试,以评估兴奋剂策略的有效性.
主要成果:
- H3阶段的特点是O3 (富含) 和O1 (缺乏) 板块的随机序列.
- 在金属层内直接的TM兴奋剂 (例如Nb) 形成了稳定的支柱,显著改善了循环稳定性.
- 间接的柱兴奋剂调节了板层的均性,但引起了粒子尺度的不均性,未能提高性能.
结论:
- 直接TM支柱通过防止有害的滑动,有效地稳定高SoC的分层氧化物阴极.
- 针对支柱形成的兴奋剂策略提供了一条可行的途径,以提高高容量的分层氧化物阴极的稳定性.
- 这项研究为先进的储能系统设计稳定阴极材料提供了指导.
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