Study on LiFePO₄ material and the high power battery

LiFePO₄ has attracted considerable attention as next generation cathode material of lithium ion battery for electric vehicles; however, the cathode material LiFePO₄ has poor rate capability attributed attributing to low electronic conductivity and low density. For obtaining high performance of electrode and battery, three types of olivine compounds LiFePO₄, which were synthesized by solid-state reaction and supplied by different producers, were evaluated for use in a lithium ion power battery for HEV in this paper. It was founded that pure and well crystallized LiFePO₄ materials with small particle sizes, and homogeneous particle size distribution were propitious to prepare the high power battery. After optimizing loading density of the material in its electrode, a high power 8Ah LiFePO₄ battery was prepared with the sample material, and the battery could discharge with at a current density of 40C rate current. Its specific power reaches 1700 W/Kg and its specific energy reaches 60 Wh/Kg.