LiFePO_(4)锂离子电池搁置产气的工艺改进  

Technology improvement of LiFePO_(4) Li-ion battery for shelved gas production

作　　者：蔡彦辉 周井 项良顺 谢跃 张芳平 相佳媛[1,2] CAI Yanhui;ZHOU Jing;XIANG Liangshun;XIE Yue;ZHANG Fangping;XIANG Jiayuan(Zhejiang Narada Power Source Co.,Ltd.,Hangzhou 310012,Zhejiang,China;Narada Power Source Co.,Ltd.,Hangzhou 311103,Zhejiang,China)

机构地区：[1]浙江南都电源动力股份有限公司,浙江杭州310012 [2]杭州南都动力科技有限公司,浙江杭州311103

出　　处：《电池》2025年第1期50-56,共7页Battery Bimonthly

摘　　要：以不同荷电状态(SOC)的138210叠片软包装磷酸铁锂锂离子电池为研究对象,对比测试电池搁置后的参数变化,研究搁置过程中的产气问题。改进分容工艺,以0.01 C回充到3.22 V下线时,在60℃下搁置90 d后,电池体积仅增加7.0 cm^(3),低于基准组样品34.9 cm^(3)的增加量;样品的高温荷电性能良好,容量恢复率为95.9%;通过SEM及电化学阻抗谱(EIS)分析发现,分容改进样品的石墨负极界面良好,无粘连现象,表面光滑无脱落小颗粒,阻抗亦无明显增加,在25℃下,电池以0.50 C充电至3.65 V、1.00 C放电至2.50 V循环400次,容量保持率为95.3%,高于基准组的83.1%。138210 laminated lithium iron phosphate Li-ion pouch battery with different states of charge(SOC)is used to comparatively test parameter changes of the battery after shelving and to investigate the gas production during shelving.With the improved grading process,the volume of the battery is increased by only 7.0 cm^(3)after being shelved at 60℃for 90 d when they are recharged to 3.22 V at 0.01 C,which is lower than the increase of 34.9 cm^(3)in the baseline sample,the samples have good high-temperature storage performance,with a capacity recovery rate of 95.9%.Through SEM and electrochemical impedance spectroscopy(EIS),it demonstrates that the graphite anode interface of the improved sample is steady,without obvious adhesion,with smoothness surface and no small particles,there is no significant increase in impedance.The battery is charged to 3.65 V at 0.50 C and discharged to 2.50 V at 1.00 C at 25℃,after 400 cycles,the capacity retention rate of the sample is 95.3%,which is superior to that of the reference group(83.1%).

关 键 词：锂离子电池 磷酸铁锂 荷电状态(SOC) 搁置 分容工艺 循环性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动] TD98[矿业工程—选矿]