Electrochemical and magnetic characterization of LiFePO <inf>4</inf> and Li <inf>0.95</inf>Mg <inf>0.05</inf>FePO <inf>4</inf> 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 sol gel route. Iron phosphides, which are electronic conductors, were formed when sintered at 850°C. Magnetic susceptibility measurements on the samples show anti ferromagnetic behaviour with T N=50±2 K for LiFePO 4 and Li 0.95Mg 0.05PO 4 sintered at temperatures below 850°C. The LiFePO 4 and Li 0.95Mg 0.05FePO4 cathodes show a stable electrochemical capacity in the range of 150-160 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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