On the possibility of polystyrene-derived carbon coating for NASICON-type Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> composites as cathode materials for sodium-ion batteries

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  • OKADA Dai
    Graduate School of Science and Technology, Niigata University
  • FUGANE Takumi
    Department of Chemistry and Chemical Engineering, Niigata University
  • MATSUMOTO Yuka
    Graduate School of Science and Technology, Niigata University
  • HASEGAWA Takuya
    Graduate School of Science and Technology, Niigata University
  • ITADANI Atsushi
    Graduate School of Science and Technology, Niigata University
  • UEMATSU Kazuyoshi
    Graduate School of Science and Technology, Niigata University
  • TODA Kenji
    Graduate School of Science and Technology, Niigata University
  • HASHIMOTO Hideki
    Graduate School of Natural Science and Technology, Okayama University Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University
  • TAKADA Jun
    Graduate School of Natural Science and Technology, Okayama University
  • SATO Mineo
    Department of Chemistry and Chemical Engineering, Niigata University

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We here prepared polystyrene-derived carbon-coated Na3V2(PO4)3 composite (NVP/C) cathode materials via a solid-phase reaction using a mixture of NVP precursor and polystyrene (as the carbon source), followed by calcination at high temperatures. Using this method, we were able to obtain active NVP materials with relatively high purity while allowing a uniform surface coating with carbon layers about 3–4 nm thick. This structure significantly prevented NVP particle growth even after calcination at high temperatures. The NVP/C material calcined at 700°C exhibited the best charge–discharge performance among the samples studied.

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