首页|Decouple charge transfer reactions in the Li-ion battery

Decouple charge transfer reactions in the Li-ion battery

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In the development of Li-ion batteries(LIBs)with high energy/power density,long cycle-life,fast charg-ing,and high safety,an insight into charge transfer reactions is required.Although electrochemical impe-dance 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 systemat-ically 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 EIS-Toolbox@LIB.This 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.

Electrochemical impedance spectroscopyUnified impedance modelCharge transfer reactionsSolid/electrolyte diffusionPorous electrodeEIS-Toolbox@LIB

Yuxuan Bai、Qiu-An Huang、Kai Wu、Jiujun Zhang

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Institute for Sustainable Energy/College of Sciences,Shanghai University,Shanghai 200444,China

Ningde Contemporary Innovation Laboratory,Contemporary Amperex Technology Co.,Limited,Ningde 352100,Fujian,China

National Science Foundation of ChinaNational Key R& D Plan of China

220781902020YFB1505802

2024

10.1016/j.jechem.2024.02.003

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.92(5)