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Metal oxide coated positive electrode materials for lithium-based batteries

  • US 8,535,832 B2
  • Filed: 08/27/2010
  • Issued: 09/17/2013
  • Est. Priority Date: 08/27/2009
  • Status: Active Grant
First Claim
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1. A lithium ion battery positive electrode material comprising a lithium metal oxide coated with a metal/metalloid oxide coating composition,wherein the lithium metal oxide can be approximately represented by a formula Li1+aNiα

  • Mnβ

    Coγ

    Aδ

    O2−

    z
    Fz, where a ranges from about 0.05 to about 0.3, a ranges from 0 to about 0.4, β

    range from about 0.2 to about 0.65, γ

    ranges from 0 to about 0.46, δ

    ranges from about 0 to about 0.15, z ranges from 0 to about 0.2 with the proviso that both α and

    γ

    are not zero, and where A is Mg, Sr, Ba, Cd, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y, Nb, Cr, Fe, V, or combinations thereof,wherein the coating composition comprises less than 2 weight percent of the positive electrode material, andwherein after the material is activated in the first cycle to a charge of 4.6V at a rate of C/10, the positive electrode material has a specific discharge capacity of at least about 260 mAh/g with a discharge rate of C/3 when discharged from 4.6V to 2.0 V at room temperature and a specific discharge capacity of at least about 230 mAh/g with a discharge rate of C/3 at the 50th charge/discharge cycle when discharged from 4.6V to 2.0 V at room temperature.

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