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Lithium secondary battery

  • US 20060068290A1
  • Filed: 09/22/2005
  • Published: 03/30/2006
  • Est. Priority Date: 09/24/2004
  • Status: Active Grant
First Claim
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1. A lithium secondary battery, comprising:

  • a negative electrode containing silicon as a negative electrode active material;

    a positive electrode containing a positive electrode active material; and

    a non-aqueous electrolyte, wherein the positive electrode active material is a layered lithium-transition metal composite oxide represented by the chemical formula LiaNixMnyCozO2, where a, x, y, and z satisfy the expressions 0≦

    a≦

    1.3, x+y+z=1, 0<

    x, 0≦

    y≦

    0.5, and 0≦

    z, and a theoretical electrical capacity ratio of the positive electrode to the negative electrode (positive electrode/negative electrode) is 1.2 or less.

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