10.1186/2251-6832-4-25

Hydrothermal synthesis of carbon-coated LiCoPO4 cathode material from various Co sources

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  • Masashi Kotobuki*1,
  1. Department of Material and Environmental Engineering, Hakodate National College of Technology, Hakodate, Hokkaido, 042-8501, JP
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Published in Issue 2013-05-24

How to Cite

Kotobuki, M. (2013). Hydrothermal synthesis of carbon-coated LiCoPO4 cathode material from various Co sources. International Journal of Energy and Environmental Engineering, 4(1 (December 2013). https://doi.org/10.1186/2251-6832-4-25
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Abstract

Abstract LiCoPO 4 has been recognized as a promising cathode material for lithium batteries due to its high stability and high operation voltage. However, poor electronic conductivity of LiCoPO 4 prohibits its practical use. A carbon coating can improve electronic conductivity of LiCoPO 4 . A hydrothermal synthesis is a very convenient method because it allows us easy preparation of small particles of carbon-coated LiCoPO 4 ; however, an effect of precursor for LiCoPO 4 preparation on the performance of the synthesized LiCoPO 4 has yet to be cleared. In this paper, the effect of Co source for carbon-coated LiCoPO 4 (LiCoPO 4 /C) preparation on performance as a cathode material for Li-ion battery is investigated. The Co source strongly affects the pH value in the starting solution and final products. The single-phase LiCoPO 4 is obtained only when CoSO 4 or CoCl 2 are used as the Co sources. A quality of carbon layer on the LiCoPO 4 is also affected by the Co source. The carbon layer on the LiCoPO 4 synthesized from CoSO 4 contains graphite carbon with high concentration which provides high electronic conductivity compared with that from CoCl 2 . Accordingly, the LiCoPO 4 /C synthesized from CoSO 4 shows a superior performance than that from CoCl 2 due to high-quality carbon layer.

Keywords

  • Hydrothermal synthesis,
  • Co sources,
  • Lithium-ion battery,
  • Carbon-coated LiCoPO4
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