摘要
三元正极材料Li[Ni1xMx]O2因其高容量和高性价比,已然成为锂离子电池最重要的正极材料之一。虽然三元正极材料具有高比容量优势,但是在高电压循环下比容量衰减、容量保持率变差进而易导致安全性降低。由于材料本身结构稳定性及热稳定性较差(阳离子混排、不可逆相变、界面反应、微裂纹等失效途径)而引起的容量衰减阻碍了其应用进程。综述了近年来三元层状正极材料容量衰减导致失效的机理研究进展,总结了目前可以提高三元层状正极材料应用前景的改性方法,以期为三元正极材料在动力电池领域的更大规模应用提供解决方案。
Due to its high capacity and price-performance ratio, Li[Ni1xMx]O2 has become one of the most important cathode materials for lithium-ion batteries. Though the advantage of high specific capacity, the specific capacity attenuation and poor capacity retention of Li[Ni1xMx]O2 under a high-voltage cycle may result in poor safety. The capacity attenuation due to inferior structural stability and thermal stability(cation mixing, irreversible phase transition, interfacial reaction, microcrack) deters the application process of the material. This paper expounds degradation mechanism and research progress of Li[Ni1xMx]O2 layered cathode materials in the latest three years and summarizes the modification method that can improve the application prospect of the materials, in the hope of providing a solution to wider application of the materials in the power battery sector.
作者
马爱军
曹征领
陈永炜
季世超
钟允晖
吴浩
程琦
MA Aijun;CAO Zhengling;Chen Yongwei;JI Shichao;ZHONG Yunhui;WU Hao;CHENG Qi(Zhejiang Tailun Electric Power Group Co.,Ltd.,Huzhou Zhejiang 313000,China;State Grid Huzhou Power Supply Company,Huzhou Zhejiang 313000,China;Zhejiang Landun Electrician New Material Technology Co.,Ltd.,Hangzhou 311400,China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《浙江电力》
2021年第1期106-115,共10页
Zhejiang Electric Power
基金
武汉应用基础研究计划(2018010401011285)。
关键词
三元正极
失效
混排
相变
微裂纹
ternary cathode
degradation
mixing
phase transition
microcrack
