Cathode active material and lithium ion secondary battery

Cathode active material and lithium ion secondary battery

  • CN 1,988,222 B
  • Filed: 12/20/2006
  • Issued: 03/20/2013
  • Est. Priority Date: 12/20/2005
  • Status: Active Grant
First Claim
Patent Images

1. lithium rechargeable batteryIt has positive electrode, negative electrode, the electrolyte that has at least active material of cathode and adhesive and be arranged in described positive electrode and described negative electrode between barrier film, andWherein the open circuit voltage of every element cell arrives in the scope less than or equal to 4.55V more than or equal to 4.25V under fully charged state,Wherein said active material of cathode containsLithium-cobalt composite oxide, it uses following general formula:

  • Li aCo 1-xMe xO 2-b, wherein Me represents at least a or two or more kinds of metallic elements that are selected from vanadium V, copper Cu, zirconium Zr, zinc Zn, magnesium Mg, aluminium Al and iron Fe;

    The a value is 0.9≤

    a≤

    1.1;

    The x value is 0≤

    x≤

    0.3;

    And the b value is-0.1≤

    b≤

    0.1, Or lithium-cobalt-nickel-Mn oxide, it uses following general formula;

    Li aNi 1-x-y-zCo xMn yMe zO 2-b, wherein Me represents at least a or two or more kinds of metallic elements that are selected from vanadium V, copper Cu, zirconium Zr, zinc Zn, magnesium Mg, aluminium Al and iron Fe;

    The a value is 0.9≤

    a≤

    1.1;

    The x value is 0<

    x<

    0.4;

    The y value is 0<

    y<

    0.4;

    The z value is 0≤

    z≤

    0.2;

    And the b value is-0.1≤

    b≤

    0.1, and Described adhesive contains polyacrylonitrile series resin,Wherein said polyacrylonitrile series resin is to comprise the compound of the compound with nitrile group and the copolymer of the compound with ester bond shown in the following formula (I),

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