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

Authors

Jane Yao, University of Wollongong
Konstantin K. Konstantinov, University of WollongongFollow
Guoxiu Wang, University of WollongongFollow
Hua-Kun Liu, University of WollongongFollow

RIS ID

18643

Publication Details

Yao, J., Konstantinov, K. K., Wang, G. Liu, H. K. (2007). Electrochemical and magnetic characterization of LiFePO4 and Li0.95Mg0.05FePO4 cathode materials. Journal of Solid State Electrochemistry, 11 (2), 177-185.

Abstract

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 antiferromagnetic behaviour with T _N=50±2 K for LiFePO₄ and Li_0.95Mg_0.05PO₄ sintered at temperatures below 850°C. The LiFePO₄ 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.