LiFePO_4/C电池的容量衰减研究  

Capacity fade study of LiFePO_4/C cell

作　　者：周琳 马冬梅 贺狄龙 朱晓辉 宋金保 

机构地区：[1]合肥国轩高科动力能源股份公司,安徽合肥230011

出　　处：《电源技术》2016年第1期39-40,43,共3页Chinese Journal of Power Sources

基　　金：国家"863"计划(2012AA110407)

摘　　要：从Li Fe PO4/C电池负极角度出发,利用扫描电子显微镜(SEM)、拉曼光谱仪(Raman)、X射线光电子能谱仪(XPS)、电感耦合等离子体测试仪(ICP)和X射线衍射光谱仪(XRD)等分析手段研究了此电池储存后的容量衰减机理。结果表明,高温和长期存储为电池负极片的劣化提供条件,促使电池负极石墨表面发生大量的副反应,消耗了正极活性锂和电解质中的锂盐,在负极表面形成不可逆锂,造成电池活性锂离子损失,电池容量衰减。From graphite anode, the capacity fading mechanism of lithium iron phosphate cell after storage on the conditions of high temperature and long term was investigated by SEM,Raman,XPS,ICP,XRD. The results show that high temperature and long term storage provided conditions for the deterioration of graphite anode. A lot of side effects happened on the graphite surface, which consumed the positive active lithium and lithium salt in the electrolyte, and prompted the irreversible lithium formed in the cathode surface. The loss of active lithium ion was responsible for cell capacity fading.

关 键 词：LIFEPO4 负极 存储 容量衰减 不可逆锂 

分 类 号：TM912[电气工程—电力电子与电力传动]