NCM811正极材料充放电过程中的应力  

Stress of NCM811 cathode material during charging and discharging process

作　　者：王婷[1] 苏红磊[2] 马维[2] 任克亮 WANG Ting;SU Hong-lei;MA Wei;REN Ke-liang(Department of Employment and Cooperation and Exchange,Ningxia Polytechnic,Yinchuan,Ningxia 750002,China;Industrial Engineering Institute,Ningxia Polytechnic,Yinchuan,Ningxia 750002,China;School of Mathematics and Statistics,Ningxia University,Yinchuan,Ningxia 750002,China)

机构地区：[1]宁夏职业技术学院就业与合作交流处,宁夏银川750002 [2]宁夏职业技术学院工业工程学院,宁夏银川750002 [3]宁夏大学数学统计学院,宁夏银川750002

出　　处：《电池》2023年第6期610-614,共5页Battery Bimonthly

基　　金：宁夏高校科学研究项目(NYG2022167);国家自然基金(12362020);宁夏自然基金(2023AAC03081)。

摘　　要：锂离子电池在充放电过程中,电极材料的变形会引起高镍层状正极材料容量衰减。使用力-化耦合模型并结合COMSOL软件,对正极材料充放电过程中的浓度场和应力场分别求解,采用COMSOL软件分析LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)正极材料锂化过程中浓度场及应力场的变化,将理论计算结果与实验进行对比。各向异性单晶NCM811材料的残余应力远小于各向同性多晶材料,残余应力是致使多晶材料易坏的主要因素。During the charging-discharging process of Li-ion battery,the deformation of electrode material caused the capacity attenuation of high-nickel layer cathode material.The mechanical-chemical coupling model and COMSOL software were used to solve the concentration field and stress field in the charge-discharge process of the cathode material,the changes of the concentration field and stress field in the lithium process of the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)cathode material were analyzed by COMSOL software,the theoretical calculation results were compared with the experiment.The residual stress of anisotropic single crystal NCM811 was much less than that of isotropic polycrystalline material,the residual stress was the main factor that made polycrystalline material fragile.

关 键 词：LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) 力-化耦合模型 有限元法 应力和应变 

分 类 号：TM912.9[电气工程—电力电子与电力传动]