摘要
锂离子电池是绿色高能可充电池,具有工作电压高、比能量大、自放电小、循环寿命长、无记忆效应、无环境污染等突出优点。本文从磷酸铁锂的结构与性能、材料的制备方法、改性、粒径控制等几方面综述了近年来对橄榄石型磷酸铁锂(LiFePO4)锂离子电池正极材料的研究进展。材料的粒度大小及其分布、离子和电子的传导能力对产品的电化学性能影响很大。在制备时,采用惰性气氛、掺杂导电材料和控制晶粒生长制备粉体是获得性能优良的LiFePO4的有效方法。
Lithium-ion batteries are green, high-energy, secondary cell, which have high working voltage, high specific capacity, low local action, long cycle life, and environmental protection. This paper introduces the research progress in recent years on the preparation, modification, how to control crystal size,relation ship between structure and performance, and prospect of olivine-type lithium iron phosphate LiFePO4 cathode materials for the lithium-ion batteries was reviewed. Particle size and its distribution, ionic and electronic conductivity have much effect on the performance of the samples. The use of inert gas, the addition of conductive dope, and the control of crystal size to gain powder are the useful way to improve the electrochemical performance of LiFePO4.
关键词
锂离子电池
正极材料
磷酸铁锂
改性
Lithium-ion batteries
Cathode materials
Lithium iron phosphate
Modification
