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电极/电解质合对Birnessite (δ-MnO₂) 机械反应和降解的影响

Wan-Yu Tsai¹, Shelby B Pillai², Karthik Ganeshan³

¹Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States.

ACS applied materials & interfaces

|June 1, 2023

概括

储能过程中的电极变形取决于电解质离子和材料结构. 离子间接到birnessite (δ-MnO2) 引起异质应力,可能导致电极降解.

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
纳米技术纳米技术

背景情况:

了解纳米电极变形是先进能源存储的关键.
伯尼石 (δ-MnO2) 是水性电池的一个有前途的阴极材料.

研究的目的:

研究电解质离子 (K+与Li+) 和电极形态对δ-MnO2变形的影响.
将局部变形与电化学性能和降解相关联.

主要方法:

操作原子力显微镜 (AFM) 来观察实时变形.
分子动力学 (MD) 模拟用于模拟阴子相互作用.
机械循环电压测量以探测机械反应.

主要成果:

在K2SO4和Li2SO4电解质中的阴离子间隔过程中,δ-MnO2电极扩大.
+间隙显示了 δ-MnO2.2 中非线性,形态依赖的变形.
在Li2SO4电解质中观察到更高的局部应力异质性,这是由于更强的Li+-δ-MnO2相互作用.

结论:

电解质离子的选择显著影响δ-MnO2电极变形和机械稳定性.
较强的Li+相互作用导致压力异质性增加和潜在降解.
形态依赖的变形凸显了在离子存储中需要量身定制的电极设计.

关键词:

电化学机械合电化学机械合电极微观结构电极微观结构机械循环电压计机械循环电压计在操作AFM.伪电容器伪电容器

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