Preparation method of carbon-nitrogen co-coated sodium vanadium phosphate sodium ion battery positive electrode material

Preparation method of carbon-nitrogen co-coated sodium vanadium phosphate sodium ion battery positive electrode material

  • CN 107,706,392 B
  • Filed: 10/18/2017
  • Issued: 07/27/2021
  • Est. Priority Date: 10/18/2017
  • Status: Active Grant
First Claim
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1. A preparation method of a carbon-nitrogen co-coated sodium vanadium phosphate sodium ion battery positive electrode material is characterized by comprising the following steps:

  • 1) preparing a precursor, namely adding sodium carbonate, sodium metavanadate, ammonium dihydrogen phosphate and folic acid into a ball milling tank, and performing ball milling and uniform dispersion to obtain a paste precursor;

    the dosage of the sodium carbonate, the sodium metavanadate and the ammonium dihydrogen phosphate is calculated according to the molar ratio of sodium, vanadium and phosphorus, and the molar ratio of the sodium, the vanadium and the phosphorus is 3;

    2;

    3;

    the amount of folic acid is 1-20% of the total mass of sodium carbonate, ammonium metavanadate, ammonium dihydrogen phosphate and folic acid;

    the ball milling is carried out by adopting zirconium dioxide small balls with the diameter of 3mm, the ball-material ratio is 1;

    10-1;

    15, and the ball milling is carried out for 6 hours mechanically at the rotating speed of 500r/min by taking alcohol as a ball milling medium;

    2) drying, namely drying the paste precursor obtained in the step

         1);

    3) performing high-temperature reaction, namely transferring the dried precursor obtained in the step

         2) into an inert atmosphere or a reducing atmosphere, performing heat treatment, and cooling to obtain a carbon-nitrogen co-coated sodium vanadium phosphate anode material of the ion battery;

    the heat treatment is carried out for 5-15 h at 700-800 ℃

    .

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