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Abstract <p>The authors study the behavior of a mixture of NH<sub>4</sub>VO<sub>3</sub>, NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub>, and NaF in a hexane medium during short-term mechanical activation (10 min) in a Pulverisette 7 planetary mill. It is shown that mechanochemical reactions proceed intensely under these conditions to produce a highly aggregated powder containing a mixture of different sodium vanadates and ammonium phosphate vanadates. Monophasic Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F<sub>3</sub> forms when the powder is subjected to heat treatment. Introducing the disaggregating additive SPAN-80 prevent intensive mechanochemical reactions, thereby leading to a reduction of the content of the Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F<sub>3</sub> phase in the product to 75 wt %. A content of the target phase as high as 92 wt % was achieved by introducing paraffin into the reagent mixture along with SPAN-80 and subsequent heat treatment in a two-stage scheme that includes compacting the intermediate product. The optimum contents of the additive are selected, and the morphology of the products synthesized using one- and two-stage schemes are studied along with the electrochemical properties of the resulting cathode material.</p>

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Synthesis and Properties of a Na3V2(PO4)2F3-Based Cathode Material from a Precursor Mechanoactivated with Carbon Additives

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • L. D. Yagudin,
  • S. V. Chizhevskaya,
  • A. A. Belousova,
  • O. Yu. Grafov,
  • A. V. Zhukov

摘要

Abstract

The authors study the behavior of a mixture of NH4VO3, NH4H2PO4, and NaF in a hexane medium during short-term mechanical activation (10 min) in a Pulverisette 7 planetary mill. It is shown that mechanochemical reactions proceed intensely under these conditions to produce a highly aggregated powder containing a mixture of different sodium vanadates and ammonium phosphate vanadates. Monophasic Na3V2(PO4)2F3 forms when the powder is subjected to heat treatment. Introducing the disaggregating additive SPAN-80 prevent intensive mechanochemical reactions, thereby leading to a reduction of the content of the Na3V2(PO4)2F3 phase in the product to 75 wt %. A content of the target phase as high as 92 wt % was achieved by introducing paraffin into the reagent mixture along with SPAN-80 and subsequent heat treatment in a two-stage scheme that includes compacting the intermediate product. The optimum contents of the additive are selected, and the morphology of the products synthesized using one- and two-stage schemes are studied along with the electrochemical properties of the resulting cathode material.