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原子分辨率 In Situ 探索相位过渡引发了单晶丰富阴极的故障

Jiayi Tang¹, Binghua Zhao¹, Zhichao Wang¹

¹National Laboratory of Solid-State Microstructures, College of Engineering and Applied Sciences & Jiangsu Key Laboratory of Artificial Functional Materials & Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, Jiangsu 210093, People's Republic of China.

ACS applied materials & interfaces

|March 25, 2024

概括

单晶阴极材料中的相变降低了离子电池的性能. 这项研究揭示了原子规模的结构演变和缺陷形成,影响周期稳定性和能量密度.

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:

单晶LiNi_xCo_yMn_zO₂ (x ≥ 0.6) 是对高能耗,稳定的离子电池有希望的.
在循环过程中,这些材料中的相位过渡是不太了解的,限制了性能优化.

研究的目的:

在电化学循环过程中研究单晶LiNi_0.83Co_0.11Mn_0.06O₂的原子级化学和微观结构演变.
阐明内部相变的过程和区域及其对电池性能的影响.

主要方法:

使用*in situ*偏差传输电子显微镜 (TEM) 进行原子级观测.
分析了分层结构的演变,相位过渡,氧气空缺,缺陷和压力.

主要成果:

在充电过程中观察到表面层结构降解和氧气空隙形成,降低稳定性.
识别了不均的脱,导致批量缺陷,反相边界和岩盐相.
由于结构不均和相位共存,发现了显著的拉力应力和内粒状裂.

结论:

颗粒内部相位过渡是单晶阴极结构降解的关键机制.
了解这些转变对于开发持久,高性能离子电池至关重要.

关键词:

富含的阴极是什么失效机制的故障机制在现场的TEM.有空缺的氧气位阶段过渡阶段过渡

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