首页|微过充下三元镍钴铝锂离子电池的老化机理

微过充下三元镍钴铝锂离子电池的老化机理

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电芯的不一致性及电量不均衡,会导致部分锂离子电池单体出现微过充现象,但此情况对于电池容量的影响未被完全揭示.在不同最高截止电压(4.2V、4.3 V和4.4 V)下对三元镍钴铝(Li,Ni0.80Co0.15Al0.05O2)电池进行恒流充电循环老化实验,采用差分电压分析、电化学阻抗谱(EIS)等测试方法,探究高截止电压循环对电池老化的影响.随着最高截止电压的升高,电池老化速度加快,以2.5 A电流循环280次后,4.2 V、4.3 V、4.4 V下的容量保持率分别为90.30％、88.19％和86.19％.差分电压分析表明,容量衰减加速的原因是正极活性物质损失和活性Li+损失.EIS测试表明,微过充导致固体电解质相界面(SEI)膜阻抗略微升高,电荷转移阻抗升高,且程度随截止电压的升高而增大.
Aging mechanism of ternary NCA Li-ion battery under slight overcharge
The inconsistency of the cells and inadequate charge balancing can result in slight overcharging of some Li-ion battery cells.The impact of this condition on battery capacity has not been fully elucidated.Galvanostatic charging and cycling aging experiments on NCA(LixNi0.80Co0.15Al0.05O2)batteries at different maximum cut-off voltages(4.2V,4.3 V and 4.4 V)are conducted and test methods such as differential voltage analysis and electrochemical impedance spectroscopy(EIS)are used to investigate the effects of high cut-off voltage cycling on battery aging.As the maximum cut-off voltage increases,the rate of battery aging accelerates.After 280 cycles at 2.5 A,the capacity retention at 4.2 V,4.3 V and 4.4 V is 90.30％,88.19％and 86.19％,respectively.Differential voltage analysis reveals that the accelerated capacity decay is due to the loss of cathode active materials and active Li+.EIS test discloses that hte mild overcharging leads to a slight increase in the impedance of the solid electrolyte interphase(SEI)film,and an increase in the charge transfer impedance,the extent of which increase with the increase of the cut-off voltage.

Li-ion batteryNCA(LixNi0.80Co0.15Al0.05 O2)slight overcharginghigh cut-off voltageaging modeloss of active materialcharge transfer impedance

王岩松、陈顺、范国栋、张希

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上海交通大学机械与动力工程学院,上海 200240

上海交通大学国家汽车动力与智能控制工程技术研究中心,上海 200240

锂离子电池 镍钴铝(LixNi0.80Co0.15Al0.05O2) 微过充 高截止电压 老化模式 活性物质损失 电荷转移阻抗

国家自然科学基金国家自然科学基金上海市自然科学基金

521772185230724623 ZR1429100

2024

10.19535/j.1001-1579.2024.02.003

电池
全国电池工业信息中心 湖南轻工研究院

电池

CSTPCD北大核心
影响因子：0.336
ISSN：1001-1579
年,卷(期)：2024.54(2)
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