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Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...

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在近固态电池中的LiNi_0.5Co_0.2Mn_0.3O₂表面上的阴极相间层的动态演变

Hui-Juan Guo^1,2, Huai-Xiang Wang^2,3, Yu-Jie Guo^1,2

¹CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, and Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.

Journal of the American Chemical Society

|November 30, 2020

概括

了解固态电池 (SSLB) 的阴极相间演变是性能的关键. 这项研究揭示了循环过程中表面结构,化学和机械学的动态变化,这对于设计更好的SSLB至关重要.

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科学领域:

材料科学
电化学
电池技术

背景情况:

先进的固态电池 (SSLB) 需要对正极材料表面机制有深入的了解.
循环过程中的结构演变,化学和机械稳定性对于SSLB设计至关重要.

研究的目的:

在工作SSLB中探索LiNi0.5Co0.2Mn0.3O2阴极粒子的动态表面演变.
实时研究阴极间相层的形成和特性.

主要方法:

使用现场原子力显微镜 (AFM) 来监测动态表面过程.
在现场扫描Derjaguin-Muller-Toporov (DMT) 模块以跟踪机械性能演变.
在不同循环阶段识别的相间层组件.

主要成果:

无机有机混合阴极相间层的实时成像.
在介面阶段内详细识别LiF,Li2CO3和有机物种.
与过渡金属迁移等电池阻抗积累和降解机制的相间演变相关.

结论:

稳定的阴极相间层对于提高SSLB性能至关重要.
对交相的动态表面形态,化学成分和机械性能的洞察对于SSLB优化至关重要.