Journal of Power Sources, Vol.243, 481-487, 2013
Novel rapid synthesis method of LiFePO4/C cathode material by high-frequency induction heating
We propose a novel low-cost synthesis method of a LiFePO4/C composite with excellent battery performances that combine high-frequency induction heating with carbothermal reduction. Our method uses a very inexpensive Fe2O3 as a Fe source. The LiFePO4/C is synthesized in far less time (within a few minutes) at 900 C than in a conventional method. Although the initially synthesized LiFePO4/C (LFP-120) contains such over-reduction impurities as Fe2P or Fe3P, optimized LiFePO4/C (LFP-90) containing no impurities is obtained by adjusting the heating time. Moreover, the primary particle size of the LFP-90 is sufficiently small to achieve fast Li-ion diffusion. The cathode containing LFP-90 has good charge discharge rate performance and shows discharge capacities of 1533 and 100.1 mAh g(-1) at 1/10 and 10Crates. The cathode with LFP-90 has excellent cycle stability and shows no degradation after high-rate charge discharge tests. Our method reasonably reduces the manufacturing cost of LiFePO4/C. (C) 2013 Elsevier B.V. All rights reserved.