Decouple charge transfer reactions in the Li-ion battery  

作　　者：Yuxuan Bai Qiu-An Huang Kai Wu Jiujun Zhang 

机构地区：[1]Institute for Sustainable Energy/College of Sciences,Shanghai University,Shanghai 200444,China [2]Ningde Contemporary Innovation Laboratory,Contemporary Amperex Technology Co.,Limited,Ningde 352100,Fujian,China

出　　处：《Journal of Energy Chemistry》2024年第5期759-798,共40页能源化学（英文版）

基　　金：the financial support from the National Science Foundation of China(22078190);the National Key R&D Plan of China(2020YFB1505802)。

摘　　要：In the development of Li-ion batteries(LIBs)with high energy/power density,long cycle-life,fast charging,and high safety,an insight into charge transfer reactions is required.Although electrochemical impedance spectroscopy(EIS)is regarded as a powerful diagnosis tool,it is not a direct but an indirect measurement.With respect to this,some critical questions need to be answered:(i)why EIS can reflect the kinetics of charge transfer reactions;(ii)what the inherent logical relationship between impedance models under different physical scenes is;(iii)how charge transfer reactions compete with each other at multiple scales.This work aims at answering these questions via developing a theory framework so as to mitigate the blindness and uncertainty in unveiling charge transfer reactions in LIBs.To systematically answer the above questions,this article is organized into a three-in-one(review,tutorial,and research)type and the following contributions are made:(i)a brief review is given for impedance model development of the LIBs over the past half century;(ii)an open source code toolbox is developed based on the unified impedance model;(iii)the competive mechanisms of charge transfer reactions are unveiled based on the developed [e-mail] work not only clarifies theoretical fundamentals,but also provides an easy-to-use open source code for EIS-Toolbox@LIB to optimize fast charge/discharge,mitigate cycle aging,and improve energy/power density.

关 键 词：Electrochemical impedance spectroscopy Unified impedance model Charge transfer reactions Solid/electrolyte diffusion Porous electrode EIS-Toolbox@LIB 

分 类 号：TM912[电气工程—电力电子与电力传动]