摘要
基于磷酸铁锂正极废料回收过程金属杂质的赋存形式,系统介绍了铝、钛、铜元素掺杂对磷酸铁锂正极材料的电化学性能影响。铝、铜可以离子掺杂和粒子掺杂进入磷酸铁锂材料,钛则以离子掺杂存在于材料中。适宜的金属掺杂量有利于提高材料的比容量、循环性能和倍率性能,超过量则降低材料的循环容量,对容量保持率则无影响。进一步探明其他杂质元素与磷酸铁锂性能间的映射关系,为杂质限度提供理论支撑,这将是未来的研究重点。
Based on the occurrence forms of metal impurities in the recycling process of the waste lithium iron phosphate cathode material,the influence of aluminum,titanium and copper doping on the electrochemical performance of lithium iron phosphate cathode material has been systematically introduced in this paper.Aluminum and copper could enter the regenerated lithium iron phosphate materials via ion doping and particle doping,respectively.Titanium exists in the cathode materials by ion doping.On one hand,a certain amount of metal is beneficial for high capacity,good cycling performance and rate performance of cathode materials.On the other hand,excessive metal doping would reduce the cycling capacity,while has no effect on the capacity retention rate.The further research would focus on the relationship between other impurity elements and properties of lithium iron phosphate,providing theoretical supporting for the limitation of metal impurities.
作者
李立平
LI Li-ping(Guangdong Guanghua Sci-tech Co.,Ltd.,Shantou 515061,China)
出处
《广州化学》
CAS
2022年第5期1-8,共8页
Guangzhou Chemistry
基金
广东省重点领域研发计划“新能源汽车”重大科技专项项目(2020B090919003)。
关键词
再生磷酸铁锂
正极材料
金属杂质
元素掺杂
电化学性能
regenerated lithium iron phosphate
cathode material
metal impurity
elemental doping
electrochemical performance
