锂(药物)
离子
阴极
材料科学
动力学
电极
传质
扩散
反应速率
化学动力学
化学工程
X射线光电子能谱
分析化学(期刊)
化学
物理化学
有机化学
热力学
催化作用
色谱法
物理
工程类
内分泌学
医学
量子力学
作者
Ya-Lu Han,Zhe-Fan Wang,Lijing Xie,Hao Wang,Zong Lin Yi,Jingxue Li,Ge Song,Chong Yan,Fangyuan Su,Cheng‐Meng Chen
出处
期刊:Carbon
[Elsevier]
日期:2023-01-01
卷期号:203: 445-454
被引量:4
标识
DOI:10.1016/j.carbon.2022.11.077
摘要
Activated carbons (AC) play a key role in enabling the reaction kinetic of cathodes in lithium ion batteries (LIBs). However, the charge transfer dynamics and reaction kinetics mechanism of AC composited cathodes along their thickness direction are still poorly understood. Herein, we systematically compare the internal reactive process evolutions of AC modified LiNi0.6Co0.2Mn0.2O2 (NCM622) cathodes and pristine NCM622 cathodes at high C-rates. The charge transfer dynamic is revealed by the time of flight secondary ion mass spectrometry and X-ray photoelectron spectra analyzes. The addition of AC endows the NCM622 cathode regions close to the current collector possess higher lithium ion concentrations, meanwhile more Ni2+ can be converted into Ni3+. The results of COMSOL Multiphysics simulations based on the porous electrode theory is analyzed to explore reaction kinetics mechanism. AC in NCM622 cathodes homogenizes the reaction distributions, contributing to the boosted reaction kinetic, eventually, resulting in the high utilization of active materials. These findings provide a direct way to reduce solid-state diffusion resistances and accelerate reaction kinetics of electrodes, which is critical for developing batteries with long cycle stability and rate performance at high rates.
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