磷酸铁锂正极材料的研究进展

Recent progress in the development of the cathode material LiFePO_4

锂离子电池正极材料磷酸铁锂(LiFePO4)的理论比容量为170mAh·g-1,电压平台为3.5V(vs.Li/Li+),安全性好,原材料来源丰富,成本低,对环境友好,因此成为当前研究热点之一.文章从LiFePO4的晶体结构和充放电机制入手,分析了其导电性和倍率性能差的原因,回顾了其充放电机制研究的进展,综述了各种改善LiFePO4导电性、提高其倍率性能的方法,最后对LiFePO4正极材料的研究方向进行了展望.

Lithium iron al for lithium ion batteries phosphate （LiFePO4） has become of great interest as a potential cathode materi because of its high theoretical capacity （170mAh·g^-1） and voltage （3.5V, vs. Li/Li＋）, low raw materials cost, non-toxicity, environmental friendliness, and safety. Starting with the crystal structure and charge-discharge mechanism, we analyze the causes of the poor electrical conductivity and rate performance of LiFePO4, review studies of the reaction mechanism, and discuss methods to improve the conductivity and rate performance. Finally, the prospects of future development in this field are presented.