摘要
随着锂离子电池在中国高高原地区及机场的应用,其在高海拔低气压环境下的循环性能及老化机制成为一个亟须解决的问题。对此,在96 kPa-25℃(常温常压)及60 kPa-25℃(常温低压)环境下,通过电池健康状态、直流放电内阻、电化学阻抗、容量增量及微分电压曲线等电池电化学特征参数对NCM523软包锂离子电池的老化行为进行了分析。研究表明:60 kPa低气压环境加速了锂离子电池老化进程,电池内部结构受60 kPa低气压应力影响,致使电池欧姆阻抗和电荷转移阻抗较常压工况分别增加6.22%和45.76%,锂脱嵌反应受限,电池界面动力学衰退;因电池阻抗增大造成以正极活性锂离子损失主导的循环容量加速衰减,电池健康状态衰减率较常压工况高3.08%。
Lithium-ion batteries have been used in high-altitude areas and airports in China,and there-fore it is urgent to investigate their cycle performance and aging mechanism in high-altitude and low-pressure environments.The aging behavior of NCM523 pouch lithium-ion batteries is analyzed in terms of electrochemical characteristics such as battery health status,charging energy,direct current internal resistance,electrochemical impedance spectroscopy,capacity increase and differential voltage curves under 96 kPa-25℃(normal temper-ature and pressure)and 60 kPa-25℃(normal temperature and low pressure).The results show that the low pressure of 60 kPa accelerates the aging process of lithium-ion batteries.The internal structure of the battery is affected by low pressure,which increases the ohmic resistance and charge transfer resistance of the battery by 6.22%and 45.76%,respectively,compared with those under normal pressure.In addition,the lithium deintercalation reaction is limited,and the kinetic properties of the battery interface are reduced.Due to the increase of the battery impedance,the cycle capacity decays rapidly,determined by the loss of active Li+of the cathode.The attenuation rate of the battery health state is higher by 3.08%than that under atmospheric pressure.
作者
谢松
平现科
巩译泽
XIE Song;PING Xianke;GONG Yize(Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province,Civil Aviation Flight University of China,Guanghan 618307,China)
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2022年第10期1883-1888,共6页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家重点研发计划(2018YFC0809500)
四川省科技计划(2021YFSY0001,2022YFG0236)
民机火灾科学与安全工程四川省重点实验室自主项目(MZ2022JB02)
中国民用航空飞行学院面上项目(J2021-098)。
关键词
锂离子电池
高高原
低气压
老化机理
特征参数
lithium-ion battery
high altitude
low pressure
aging mechanism
characteristic parameter
