Sodium ion battery carbon sphere negative electrode material and preparation method thereof

Sodium ion battery carbon sphere negative electrode material and preparation method thereof

  • CN 106,910,880 B
  • Filed: 03/28/2017
  • Issued: 09/22/2020
  • Est. Priority Date: 03/28/2017
  • Status: Active Grant
First Claim
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1. A preparation method of a sodium ion battery carbon sphere negative electrode material is characterized by comprising the following steps:

  • carrying out hydrothermal reaction on a carbon source to obtain a carbon sphere precursor, and sintering the carbon sphere precursor to obtain carbon spheres;

    dipping the carbon spheres in a cobalt salt solution, and then carrying out solid-liquid separation and drying to obtain a precursor;

    carbonizing, washing and drying the precursor to obtain the negative electrode material;

    the cathode material is a concentric spherical carbon material, the inner layer is hard carbon, and the outer layer is a graphitized carbon material layer;

    wherein the thickness of the graphitized carbon material is 10-100 nm;

    the specific surface area of the carbon sphere negative electrode material is 10-1000m2/g;

    The carbon source is at least one of glucose, sucrose, lignin, cellulose and starch;

    the hydrothermal reaction temperature is 150 ℃ and

    250 ℃

    , and the reaction time is 5-30 hours;

    the sintering process is carried out in protective atmosphere, and the temperature of the sintering process is 1000-1200 ℃

    ;

    the mass ratio of the carbon source to the cobalt salt is 2-30;

    the concentration of the cobalt salt is 10-100 g/L;

    the dipping time is 8-12 h;

    the carbonization temperature is 700 ℃ and

    1200 ℃

    .

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