Abstract:

Olive structure lithium iron phosphate LiFePO₄ is considered as a promising cathode material for lithium ion power battery due to its high theoretical capacity，high safety，long cycle life，environmental benign and abundant raw material source. However，the instinct drawbacks of olive structure induces a poor rate performance. In this paper，methods for enhancing its rate performance are reviewed，including carbon coating，cation doping，synthesis nanoscale materials and preparing porous materials，etc. Among all the methods，LiFePO₄ microsphere material，assembled by nanoparticles basic structure，displayed high rate performance and high volume energy density，has vast prospection .

摘要：

橄榄石结构的磷酸铁锂（LiFePO₄）被认为是潜力巨大的锂离子动力电池的正极材料，具有理论比容量高、安全性好、循环寿命长、环境友好和原料来源广泛等优点。但是，由于其本身结构的缺陷，导致其倍率性能低下。本文阐述了近年来改善LiFePO₄的倍率性能的研究，重点介绍了包覆碳导电层、掺杂金属离子、合成纳米材料、制备多孔材料等方法，其中以纳米颗粒为基本结构单元的多孔LiFePO₄微米球材料倍率性能优异、体积能量密度高，具备广阔的研究和应用前景。