动能
阳极
扩散
石墨
活化能
材料科学
热力学
固态
化学
分析化学(期刊)
物理化学
物理
电极
色谱法
复合材料
量子力学
作者
Yingming Gao,Yan Liu,Chen Zhao,Man‐Man Chen,Shengchen Yang,Guosheng Shao,Jing Mao
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2024-02-08
标识
DOI:10.1149/1945-7111/ad27b4
摘要
Abstract The slow electrochemical reaction kinetics of artificial graphite is one of the limiting factors for safety of lithium-ion batteries, especially the lack of systematic research on activation energies of various kinetic processes. In this work, cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and galvanostatic intermittent titration technique (GITT) were used to investigate key kinetic parameters of artificial graphite such as solid-state Li+ diffusion coefficient(DLi+) and activation energy. The results reveal the evaluation of the chemical diffusion coefficient of same material is independent of the technique and shows a similar value, with DLi+ ranging from 10−11 to 10−13 cm2·s−1. The activation energies measured by EIS and GITT for solid-state Li+ diffusion in graphite at 50% depth of discharge are 74.5 and 66.8 kJ·mol−1, which are in the same order of magnitude as the activation energies of charge transfer resistance (59.5 kJ·mol−1), electrode/electrolyte interface membrane impedance (56.1 kJ·mol−1), and ohmic impedance (6.6 kJ·mol−1). This demonstrates that the solid-state Li+ diffusion, interface charge transfer process, and Li+ transmission through solid electrolyte interface membrane are significantly affected by temperature. This work provides a reliable parameter basis for establishing more accurate thermal-electrochemical coupling models and designing safer battery thermal management systems for lithium-ion batteries.
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