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在丰富的多层阴极中,激活引起的结构扭曲

Liguang Wang^1,2, Alvin Dai³, Wenqian Xu⁴

¹School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

Journal of the American Chemical Society

|August 14, 2020

概括

研究人员探索了富含的氧化物用于高能电池. 在充电过程中发现微观结构变化和结构扭曲, 这对于提高电池性能和稳定性至关重要.

科学领域:

材料科学
电化学
电池技术

背景情况:

有丰富的基层氧化物为能量密集的电池提供了高容量.
了解它们在离子氧化还原过程中的微结构演变是优化性能的关键.

研究的目的:

在离子氧化还原过程中研究Li2MnO3类相的微结构变化.
将这些变化与电池性能和结构稳定性相关联.

主要方法:

用空间分辨的同步射线测量来探测微观结构的演变.
为了研究相位过渡,使用了脱样本的热扰动.

主要成果:

揭示了Li2MnO3类域与散体体结构之间的相互作用.
在高电压下观察到离子激活和新的结构扭曲,与提取有关.
结构扭曲与不可逆转的阶段过渡之间存在关联.

结论:

微观结构的演变,特别是 Li2MnO3 类似阶段的结构扭曲,会对电池的稳定性产生重大影响.
这些发现为设计用于商业应用的高容量阴极材料提供了洞察力.

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