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Lithium secondary battery

  • US 10,644,306 B2
  • Filed: 01/18/2019
  • Issued: 05/05/2020
  • Est. Priority Date: 01/18/2018
  • Status: Active Grant
First Claim
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1. A lithium secondary battery, comprising:

  • a cathode formed from a cathode active material including a first cathode active material particle and a second cathode active material particle;

    an anode; and

    a separator interposed between the cathode and the anode,wherein the first cathode active material particle includes a lithium metal oxide including a concentration gradient region between a central portion and a surface,wherein the second cathode active material particle includes a lithium metal oxide having a single particle structure, and is represented by Chemical Formula 1, and a blending weight ratio of the first cathode active material particle and the second cathode active material particle is in a range from 8;

    2 to 1;

    9;


    LixM1′

    aM2′

    bM3′

    cOy



    [Chemical Formula 1]wherein, in Chemical Formula 1, M1′

    , M2′ and

    M3′

    are selected from Ni, Co, Mn, Na, Mg, Ca, Ti, V, Cr, Cu, Zn, Ge, Sr, Ag, Ba, Zr, Nb, Mo, Al, Ga, W or B, M1′

    includes Ni, M2′

    includes Co, M3′

    includes Mn, and 0<

    x≤

    1.1, 2≤

    y≤

    2.02, 0.7≤

    a≤

    0.9, 0.1≤

    b+c≤

    0.3 and a+b+c=1.

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