【作者】 李佳； 谢晓华； 刘浩涵； 夏保佳；

【Author】 Li Jia,Xie Xiao-hua,Liu Hao-han,Xia Bao-jia (Shanghai institute of microsystem and information technology,Chinese Academy of Sciences,Shanghai 200050,China)

【机构】 中国科学院上海微系统与信息技术研究所；

【摘要】 在高温(55℃)条件下对不同荷电态锂离子电池进行储存,并对储存前后的电池进行性能测试和交流阻抗分析。结果发现,经不同荷电态高温储存后,锂离子电池的1C和10C容量均发生衰减,同时直流内阻增大。随着储存荷电态的升高,电池的容量和功率性能衰减加剧。交流阻抗分析表明,锂离子电池储存后功率性能衰减原因主要来源于正极的阻抗增大。低荷电态储存有利于锂离子电池功率性能的保持。更多还原

【Abstract】 Lithium ion batteries were stored at elevated temperature(55℃) in different state of charge(SOC).The performances and EIS of the batteries before and after storage were tested.The experimental results reveal that after storage at elevated temperature and different SOCs,the 1C and 10C capacity of the batteries faded with their direct current resistance increasing.The higher the storage SOC was,the more obviously the capacity and power property of the batteries decayed.The EIS analysis shows that the increase of the cathode impedance may mainly contribute to the overall degradation of the Li-ion cells after storage.Consequently.it can be concluded that storage at low SOC condition is propitious to keep original power property of lithium ion battery.更多还原