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Impedance studies on the 5-V cathode material, LiCoPO4

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Abstract

Olivine-structured LiCoPO4 is synthesized by a Pechini-type polymer precursor method. The structure and the morphology of the compounds are studied by the Rietveld-refined X-ray diffraction, scanning electron microscopy, Brunauer, Emmett, and Teller surface area technique, infrared spectroscopy, and Raman spectroscopy techniques, respectively. The ionic conductivity (σ ionic), dielectric, and electric modulus properties of LiCoPO4 are investigated on sintered pellets by impedance spectroscopy in the temperature range, 27–50 °C. The σ (ionic) values at 27 and 50 °C are 8.8 × 10−8 and 49 × 10−8 S cm−1, respectively with an energy of activation (E a) = 0.43 eV. The electric modulus studies suggest the presence of non-Debye type of relaxation. Preliminary charge–discharge cycling data are presented.

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Acknowledgments

One of the authors (M.P.) is thankful to the Dept. of Science and Technology, Govt. of India/Japan Science and Technology Agency for JRF position in the DST/JST project. M.P. also thanks the NUS for the summer Fellowship under NUS—India Research Initiative. The authors also thank Prof. G.V. Subba Rao, Dept. of Physics, NUS for helpful discussions.

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Authors and Affiliations

  1. Department of Physics, National University of Singapore, Singapore, 117542, Singapore

    M. Prabu, M. V. Reddy & B. V. R. Chowdari

  2. Department of Physics, Kalasalingam University, Krishnankoil, 626 126, Tamil Nadu, India

    M. Prabu & S. Selvasekarapandian

Authors
  1. M. Prabu
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  2. S. Selvasekarapandian
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  3. M. V. Reddy
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  4. B. V. R. Chowdari
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Correspondence to S. Selvasekarapandian or B. V. R. Chowdari.

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Prabu, M., Selvasekarapandian, S., Reddy, M.V. et al. Impedance studies on the 5-V cathode material, LiCoPO4 . J Solid State Electrochem 16, 1833–1839 (2012). https://doi.org/10.1007/s10008-012-1670-2

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  • DOI: https://doi.org/10.1007/s10008-012-1670-2

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