摘要
锂离子电池作为储能器件在日常生活中发挥着重要的作用,社会日益增长的能源需求,要求锂离子电池具有更高的能量密度和更好的性能。提高工作电压是提高锂离子电池能量密度的一种直接方法。本文对近年来高压钴酸锂正极材料掺杂、包覆及复合改性的研究进展进行了综述。复合包覆以及复合改性将是高电压钴酸锂正极材料重点研究开发方向,运用不同的改性方法可以有效抑制钴酸锂在高电压下的结构变化,提升钴酸锂晶体结构的稳定性和界面稳定性,从而提高钴酸锂在高电压下的克比容量、热稳定性、循环稳定性和倍率性能,并使得锂离子电池各项性能得到改善。
Lithium-ion batteries play an important role in all aspects of daily life as energy storage devices.With the increasing energy demand of society,lithium-ion batteries are required to have higher energy density and better performance.Increasing the operation voltage is a direct way to increase the energy density of lithium-ion batteries.In this paper,the research progress of doping,coating and composite modification of high-voltage LiCoO2 cathode materials in recent years was reviewed.Composite coating and composite modification will be the key research and development direction of high-voltage LiCoO2 materials.Different modification methods can effectively inhibit the structural change of LiCoO2 under high voltage,improve the stability of crystal structure and interface,so as to improve the specific capacity,thermal stability,cycle stability and rate performance of LiCoO2 under high voltage.The performance of lithium-ion batteries was improved.
作者
刘小虹
李国敏
LIU Xiao-hong;LI Guo-min(GPC Battery Co.,Ltd.,Shenzhen,Guangdong Province,518015,China)
出处
《电池工业》
CAS
2019年第6期314-318,共5页
Chinese Battery Industry
关键词
高电压
钴酸锂
正极材料
掺杂
包覆
复合改性
High-voltage
LiCoO2
Cathode materials
Doping
Coating
Composite modification
