阿伦尼乌斯图
材料科学
活化能
阿累尼乌斯方程
阴极
离子键合
晶界
锂(药物)
电化学
离子电导率
电极
分析化学(期刊)
离子
扩散
化学物理
物理化学
热力学
复合材料
微观结构
化学
电解质
物理
内分泌学
医学
有机化学
色谱法
作者
Shan Yang,Binggong Yan,Jinliang Wu,Lü Li,Kaiyang Zeng
标识
DOI:10.1021/acsami.6b16321
摘要
This paper presents the in situ mapping of temperature-dependent lithium-ion diffusion at the nanometer level in thin film Li1.2Co0.13Ni0.13Mn0.54O2 cathode using electrochemical strain microscopy. The thin-film Li1.2Co0.13Ni0.13Mn0.54O2 cathode exhibits higher lithium-ion diffusivities with increasing temperature, which explains the higher capacity observed in the lithium-ion batteries with a Li-rich cathode at elevated temperature. In addition, the activation energy for lithium-ion diffusion can be extracted in an Arrhenius-type plot at the level of grain structure with the assumption that the ionic movement is diffusion controlled. Compared with the grain interiors, the grain boundaries show relatively lower activation energy; hence, it is the preferred diffusion path for lithium ions. This study has bridged the gap between atomistic calculations and traditional macroscopic experiments, showing direct evidence as well as mechanisms for ionic diffusion for Li-rich cathode material.
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