A LiFePO4-type lithium secondary battery cell of 8 Ah capacity with a high energy density and power density was developed for hybrid electric vehicle(HEV)applications by optimizing the key raw materials and pro-cess design.The 8 Ah class LiFePO4 cell with an energy density of 77.2 Wh?kg-1 exhibits a power density of 2818 W?kg-1 at 50％SOC(state of charge).The battery shows good cyclic capability with the capacity retention of 81.1％after 1,870 cycles at 5C charge and 10C discharge rates.It is demonstrated that the cells have an excellent balance of high-power,high-energy,low temperature,and long-life performance for meeting the requirements of HEV.