锂离子电池正负极材料对低温充放电性能影响  

Influence of anode and cathode materials on low temperature charging and discharging performance of lithium ion batteries

作　　者：李爽 张树国 杜晨树 LI Shuang;ZHANG Shuguo;DU Chenshu(Ningbo Veken Battery Co.,Ltd.,Ningbo Zhejiang 315800,China)

机构地区：[1]宁波维科电池有限公司,浙江宁波315800

出　　处：《电源技术》2021年第8期979-982,共4页Chinese Journal of Power Sources

摘　　要：分别采用通过降低材料粒径和碳包覆方式优化后的正负极材料,使用扫描电镜表征钴酸锂和石墨的形貌,通过控制变量法制备四种方案的电池样品,对其电化学阻抗和低温下充放电曲线、循环曲线、容量微分曲线及析锂情况等进行分析。结果表明,适当减小钴酸锂材料粒径和碳包覆改性石墨都是优化锂离子电池正负极材料的方式,二者搭配使用能够改善锂离子电池低温性能。优化正极材料对低温放电性能改善效果明显,优化负极材料对低温充电性能改善效果明显。正极与负极材料活性不匹配或材料与使用条件不匹配会引起电池性能缺陷。The anode and cathode materials optimized by reducing particle size and carbon coating respectively,and the morphology of lithium cobalt oxide and graphite were characterized by SEM.Four kinds of battery samples were prepared by controlling variables.Their electrochemical impedance,charge-discharge curve and capacity differential curve at low temperature,as well as lithium evolution were analyzed.The results show that appropriately reducing the particle size of lithium cobalt oxide and carbon coated modified graphite are two ways to optimize the anode and cathode materials,and the combination of the two can improve the low-temperature performance.The optimized cathode material can improve the low temperature discharge performance obviously,and the optimized anode material can improve the low temperature charging performance obviously.The mismatching of material activity between positive and negative poles or the mismatching of material and using conditions may cause performance defects.

关 键 词：锂离子电池 小颗粒钴酸锂 碳包覆石墨 低温充电 低温放电 

分 类 号：TM912[电气工程—电力电子与电力传动]