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在4.55V的高压液态COO₂的大规模结构降解的新见解

Weiguang Lin^1,2, Wei Su³, Ting Lin^1,2

¹Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.

|June 6, 2024

概括

研究人员在高压离子电池阴极中发现了一种新的机械降解机制. 化氧化 (LiCoO2) 中的带形成改善了充电期间的结构完整性,为更好的电池性能提供了洞察力.

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:

离子电池中的多层氧化物阴极材料在高压充电期间遭受机械和结构性降解,导致容量迅速色.
驱动这种降解的精确机制,特别是在极端条件下,仍然不完全理解.
了解这些机制对于开发更耐用和高性能电池至关重要.

研究的目的:

在高压分层氧化物阴极材料中研究一种新的机械降解途径.
阐明机械应力,结构转变和电化学性能之间的关系.
为提高离子电池阴极的稳定性提供见解.

主要方法:

使用了Mg和Ti联合合的LiCoO2阴极材料.
将阴极充电到 4.55 V 的高电压 (vs Li/Li+).
采用机器学习辅助的原子分辨率成像和第一原则计算.

主要成果:

确定了一种新型的机械降解,其特点是LiCoO2阴极中形成曲线带.
观察到曲带可以减轻裂的传播,从而提高高度化状态的结构完整性.
发现曲带的形成经常与O3到O1的相变相相结合,这在能量上是有利的.

结论:

这项研究揭示了高压LiCoO2阴极中机械降解的新型机制,其中包括曲带的形成.
证明了电化学应力,机械故障和结构相变 (O3到O1) 之间的相互作用.
这些发现为设计用于先进的离子电池的改进的高压分层氧化物阴极材料提供了宝贵的指导.

关键词:

降解降解降解降解降解.高压电机 LiCoO2O2 的高压电机这是一个Kink乐队.离子电池是一种离子电池.阶段转换的相位转换.

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