Synthesis of Low Cost LiFePO4/C Cathode Material for Li-ion Battery
Xu, Tugen a,b,c Wang, Lianbang*,a Li, Shenga Ma, Chunan a
(a State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032) (b College of Materials and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036) (c Educational Ministry Key Laboratory of Organosilicon Chemistry and Material Technology, Hangzhou Normal University, Hangzhou 310012)
LiFePO4 is being used as the cathode material for Li-ion batteries of electric vehicle (EV) because of low cost and high safety. In this work, a carbon-coated LiFePO4 was synthesized by a thermal decomposition method using Li3PO4, FePO4, Fe powder and ethanol as the raw materials. Experimental results showed that LiFePO4/C particles were evenly distributed with the sizes of 200 nm～1 μm, the surface of particles was coated by carbon, and the particles were linked together by carbon fibers. The first discharge capacity of sample reached 137 mAh•g－1 and the first columbic efficiency was over 95%. After 50 cycles, the discharge capacity still remained unchanged, which indicated the good cycle capability and reversibility. Our research lowered the cost of Li-ion batteries and provided a feasible application in Li-ion batteries for industrial production.