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对于离子电池的高压螺旋阴极性能损失的微结构洞察力
Peng Zuo1, Pavan Badami2, Stephen E Trask2
1Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99354, USA.
Small (Weinheim an der Bergstrasse, Germany)
|October 26, 2023
概括
在电池循环过程中,螺旋,,氧化 (LNMO) 阴极材料会发生跨颗粒裂. 这些裂增加了电解质暴露和结构变化,导致离子电池的性能下降.
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
- 电池技术 电池技术
背景情况:
- 螺旋结构的LiNixMn2−xO4 (LNMO) 是高压离子电池的有前途的阴极,因为其丰富的元素.
- 在LNMO电池中经常观察到性能损失,但与微观结构变化的联系尚不清楚.
研究的目的:
- 为了研究在离子电池循环过程中LNMO在原子尺度上的结构演变.
- 为了将微观结构变化与性能退化相关联.
主要方法:
- 在渐进循环过程中对LNMO结构进行原子尺度的研究.
- 使用先进的显微镜和表征技术分析结构变化.
主要成果:
- 跨颗粒裂纹在LNMO粒子表面开始,增加电解质接触.
- 裂表面呈现出各种各样的格子结构:岩盐,Mn3O4类和混合区.
- 延长循环加剧了裂纹和格子扭曲,以及表面相位转换和空隙形成.
结论:
- 跨颗粒裂纹和相关的微观结构变化是LNMO阴极降解的主要驱动因素.
- 了解这些结构变化对于设计更稳定的高压阴极材料至关重要.
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