Electrochemical and magnetic characterization of LiFePO4 and Li0.95Mg0.05FePO4 cathode materials

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Journal Article
Journal of Solid State Electrochemistry, 2007, 11 (2), pp. 177 - 185
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A series of lithium iron phosphates was synthesized via the solgel route. Iron phosphides, which are electronic conductors, were formed when sintered at 850°C. Magnetic susceptibility measurements on the samples show antiferromagnetic behaviour with T N=50±2 K for LiFePO4 and Li0.95Mg0.05PO4 sintered at temperatures below 850°C. The LiFePO4 and Li0.95Mg0.05FePO4 cathodes show a stable electrochemical capacity in the range of 150160 mA h/g on cycling. The cyclability deteriorates with increasing sample sintering temperature due to the increased crystal size and impurities.
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