正极材料LiFePO_4倍率性能提升方法研究进展

橄榄石结构的磷酸铁锂(LiFePO_4)因其容量大、循环寿命长、成本低和安全等优点,被认为是一种很有前途的高能量密度正极材料。然而,磷酸铁锂的自身晶体结构导致该材料存在电子电导率差、离子扩散系数小和振实密度低等问题,制约了其在锂离子动力电池中的应用。综述了近些年来国内外提高LiFePO_4正极材料倍率性能的方法,其中包括碳包覆和元素掺杂,同时对上述方法的优缺点进行了讨论。

Research progress in improving the rate performance of LiFePO_4 cathode material

Olivine lithium iron phosphate (LiFePO 4) is considered as a promising high power density cathode material, due to its high capacity, long cycle life, low cost, and safety. However, the instinct crystal structure of LiFePO 4 induces low electronic conductivity, poor ions diffusion coefficient and low tap density, which limits its commercial application in lithium-ion power batteries. In this review, the methods on enhancing the rate performance of LiFePO 4 cathode material, including carbon coating and elements doping were summarized. Meanwhile, the advantages and disadvantages of above methods are also discussed.