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在电池中操作单粒子离子动态的光学跟踪

Alice J Merryweather^1,2, Christoph Schnedermann³, Quentin Jacquet²

¹Cavendish Laboratory, University of Cambridge, Cambridge, UK.

|June 24, 2021

概括

一个新的光学显微镜允许实时,纳米尺度成像离子动力学在电池材料. 这种高通量方法可以更快地选和开发先进的离子电池技术.

科学领域:

材料科学
电化学
纳米技术

背景情况:

提升离子电池技术,特别是快速充电, 需要了解纳米级材料的动态过程.
目前的操作成像技术 (同步X射线,电子显微镜) 不适合高通量材料选,阻碍了快速改进.

研究的目的:

介绍一个简单的,基于实验室的光学干扰散射显微镜,用于纳米级的离子动力学.
在电池循环过程中应用该方法来研究 Li_xCoO_2 阴极材料的单个粒子.
为了实现高通量选和电池材料的合理设计.

主要方法:

开发和应用光学干扰计散射显微镜.
在电化学循环过程中对单个Li_xCoO_2粒子内的离子动态进行现场成像.
对相位转换,扩散率和域边界形成的分析.

主要成果:

直接可视化绝缘体到金属,固体溶液和的阶段过渡.
确定单粒子扩散率,揭示不同的充/放电机制.
与单临床格子扭曲相关的动态域边界形成的观察.

结论:

开发的光学显微镜技术为研究电池材料中的纳米离子动态提供了高通量替代方案.
这种方法有助于探索影响电池降解的因素,如位移和循环速率.
图像概念广泛适用于电池以外的各种离子传输系统.

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