Lithium ion secondary battery negative electrode material and preparation method thereof

Lithium ion secondary battery negative electrode material and preparation method thereof

  • CN 104,140,093 A
  • Filed: 05/10/2013
  • Published: 11/12/2014
  • Est. Priority Date: 05/10/2013
  • Status: Active Application
First Claim
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1. a preparation method for ion secondary battery cathode material lithium, it comprises the steps:

  • 1. natural graphite, Raw needle coke powder and pitch to be mixed, and obtains compound;

    Wherein, the mass ratio of described natural graphite and described Raw needle coke powder is 9;

    1~

    5;

    5;

    The consumption of described pitch is 20~

    40% of described natural graphite and described Raw needle coke powder total mass;

    2. described compound is heat-treated at 300~

    700 ℃

    , be cooled to room temperature, obtain material;

    3. described material is carried out at 2500~

    2800 ℃

    to graphitization processing;

    4. screening is processed, and extracting screen underflow, obtains.

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