低温搁置对锂离子电池性能的影响
Effect of low-temperature storing on the performance of Li-ion battery
马文斌 1杨小钰 1谢松1
作者信息
- 1. 中国民用航空飞行学院民航安全工程学院,四川德阳 618307
- 折叠
摘要
了解低温搁置对电池循环性能及老化机制的影响,对锂离子电池在低温环境的运行管理很重要.在-40℃和25℃下搁置电池,并以1.00 C倍率在2.30～3.65 V进行充放电,重复上述操作15次.通过健康状态(SOH)、电化学阻抗、微分电压及容量增量曲线等性能参数,对锂离子电池的老化行为进行分析.低温搁置对电池SOH有一定影响,与对照组相比,平均容量保持率下降了2.04个百分点,首次库仑效率为97.4％.低温搁置后的电池欧姆阻抗和电荷转移阻抗增大.分析微分电压和容量增量曲线发现,电池内部活性物质和活性Li+损失是造成容量衰减的主要原因.
Abstract
Understanding the effects of prolonged low-temperature storing on battery cycle performance and aging mechanisms is important for the operation and management of Li-ion battery in low-temperature environments.The batteries are set aside at-40 ℃ and 25 ℃ and are subjected to charge-discharge at 1.00 C rate in 2.30-3.65 V,the above operation is repeated 15 times.The aging behavior of Li-ion battery is analyzed by parameters such as state of health(SOH),electrochemical impedance,differential voltage and incremental capacity curves.Low-temperature storing has a certain influence on SOH of the battery,compared with the control group,the average capacity retention is decreased by 2.04 percentage points,the initial Coulombic efficiency is 97.4％.The Ohmic impedance and charge transfer impedance of the battery increase after low-temperature storing.By analyzing the differential voltage and incremental capacity curves,it is found that the loss of active material and active Li+inside the battery are the main causes of capacity degradation.
关键词
锂离子电池/低温搁置/电化学性能/充放电曲线/容量损失/老化机理Key words
Li-ion battery/low-temperature storing/electrochemical performance/charge-discharge curve/capacity loss/aging mechanism引用本文复制引用
基金项目
四川省重点研发计划(2022YFG0236)
四川省重点实验室自主项目(MZ2022JB02)
中国民用航空飞行学院研究生创新项目(X2023-4)
出版年
2024
国家科技期刊平台
NSTL
万方数据