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Positive electrode active materials for secondary batteries and methods of preparing same

  • US 6,878,490 B2
  • Filed: 10/29/2001
  • Issued: 04/12/2005
  • Est. Priority Date: 08/20/2001
  • Status: Expired due to Term
First Claim
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1. A positive electrode active material for secondary lithium and lithium-ion batteries comprising:

  • at least one electron conducting compound existing in a first single phase having the formula LiM1x−

    y
    {A}yOz wherein M1 is a transition metal;

    {A} is represented by the formula Σ

    wiBi wherein Bi is an element other than M1 used to replace the transition metal M1 and wi is the fractional amount of element Bi in the total dopant combination such that Σ

    wi=1;

    Bi is a cation in LiM1x−

    y
    {A}yOz;

    0.95≦

    x≦

    1.05;

    0≦

    y≦

    x/2; and

    1.90≦

    z≦

    2.10; and

    at least one electron insulating and lithium ion conducting lithium metal oxide Li2M2O3 existing in a second single phase structurally separate from the first single phase of the compound having the formula LiM1x−

    y
    {A}yOz, wherein M2 is at least one tetravalent metal selected from the group consisting of Ti, Zr, and Hf.

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