Preparation method of lithium ion battery carbon cathode material coating layer

Preparation method of lithium ion battery carbon cathode material coating layer

  • CN 102,610,795 A
  • Filed: 01/20/2011
  • Published: 07/25/2012
  • Est. Priority Date: 01/20/2011
  • Status: Active Grant
First Claim
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1. the preparation method of a carbon negative electrode material of lithium ion cell coating layer is characterized in that:

  • adopt the spray drying granulation method to carry out, step is;

    1) carbon dust, polymer emulsion, the stabilizer aqueous solution and water are mixed by a certain percentage, be mixed with slurry;

    Carbon dust in the slurry;

    polymer in the polymer emulsion (solid content);

    stabilizer (solid content);

    the part by weight of water is respectively 10~

    35 (wt) %;

    3~

    35 (wt) %;

    1~

    10 (wt) %;

    40~

    80 (wt) %;

    2) above-mentioned slurry is sent into carried out granulation in the spray drying granulation machine and coat, the slurry emulsion is separated into droplet through atomizer, and droplet contacts with the heated drying air, removes moisture, and pulverize powder particle makes the surperficial coated polymer of carbon dust;

    3) place carbonizing apparatus to the carbon dust of coated polymer at last;

    Under nitrogen protection;

    Progressively heat up, through 100-120 ℃

    of water smoking maintenance 1.5-2.5 hour, 300-500 ℃

    of deoxidation kept 2.5-3.5 hour;

    End temperature rises 600~

    2500 ℃

    of carburizing temperatures, obtains required carbon negative electrode material of lithium ion cell coating layer;

    Said polymer emulsion contains micron or nanometer at least, and (5~

    0.05um) polymer beads and water, polymer emulsion gets polymer solids level 3~

    35 (wt) % through polymerization reaction or through high speed shear mulser or rubber mill emulsification.

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