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

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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 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 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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Acknowledgements

This work was supported by the Australian Research Council through the ARC Centre for Nanostructured Electromaterials and the ARC Linkage Project “Large-scale rechargeable lithium battery for power storage and electric vehicle applications”(Project ID: LP0453766). We thank our colleagues Dr. Alexey Pan for help with magnetic property measurement and Dr. X.L. Wang for analysis of magnetic data.

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Authors and Affiliations

  1. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia

    J. Yao, K. Konstantinov, G. X. Wang & H. K. Liu

  2. ARC Centre for Nanoelectromaterials, University of Wollongong, Wollongong, NSW 2522, Australia

    G. X. Wang & H. K. Liu

Authors
  1. J. Yao
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  2. K. Konstantinov
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  3. G. X. Wang
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  4. H. K. Liu
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Correspondence to G. X. Wang.

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Yao, J., Konstantinov, K., Wang, G.X. et al. Electrochemical and magnetic characterization of LiFePO4 and Li0.95Mg0.05FePO4 cathode materials. J Solid State Electrochem 11, 177–185 (2007). https://doi.org/10.1007/s10008-005-0083-x

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  • DOI: https://doi.org/10.1007/s10008-005-0083-x

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