摘要
本文介绍了线性扫描伏安法(LSV)测试NCM622/石墨锂离子电池电极材料Li(Ni0.6Co0.2Mn0.2)O2(NCM622)和石墨反应速率常数。结果表明,NCM622反应速率常数取值范围为6.11×10^(-12)~6.85×10^(-11)m^(2.5)·mol^(-0.5)·s^(-1),且在半充的状态下,反应速率常数最大。石墨材料的反应速率常数比NCM622材料的反应速率常数高一个数量级,范围为1.78×10^(-10)~2.78×10^(-10)m^(2.5)·mol^(-0.5)·s^(-1)。因此对于NCM622/石墨锂离子电池体系,全电池反应速率取决于正极。
The rate constants of reaction(k)of Li(Ni0.6Co0.2Mn0.2)O2(NCM622)positive electrode material and graphite negative electrode material in NCM622/graphite lithium ion battery was studied by linear sweep voltammetry(LSV)in this work.The results as following:the rate constants of NCM622 positive electrode ranges from 6.11×10^(-12)m^(2.5)·mol^(-0.5)·s^(-1)to 6.85×10^(-11)m^(2.5)·mol^(0.5)·s^(-1)and reaches its maximum value at half charged state.The rate constants of graphite negative electrode are larger than NCM622 by one magnitude,ranging from 1.78×10^(-10)m^(2.5)·mol^(-0.5)·s^(-1)to 2.78×10^(-10)m^(2.5)·mol^(0.5)·s^(-1).So,it is plausible to conclude that the reaction rate in NCM622/graphite lithium ion battery is determined by cathode material.
作者
邵素霞
朱振东
彭文
SHAO Su-xia;ZHU Zhen-dong;PENG Wen(Hefei Gotion High-tech Power Energy Co.,Ltd.,Hefei,Anhui Province,230012,China)
出处
《电池工业》
CAS
2020年第4期179-183,共5页
Chinese Battery Industry
基金
国家重点研发计划项目(2016YFB0100304)
关键词
锂离子电池
线性扫描伏安法
反应速率常数
Lithium ion battery
Linear sweep voltammetry
Rate constant of reaction