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Multifunctional mixed metal olivines for lithium ion batteries

  • US 9,509,019 B2
  • Filed: 05/29/2012
  • Issued: 11/29/2016
  • Est. Priority Date: 07/12/2007
  • Status: Active Grant
First Claim
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1. An electroactive composition for use as a positive electrode material in an electrochemical cell comprising a high voltage indicator and a low voltage indicator, said composition comprising an olivine lithium metal phosphate material having the formula LixM′

  • yM″

    zM′



    wPO4, whereinM′

    is one or more of Mn and Fe;

    M″

    is one or more of Mn, Co and Ni, wherein M″

    is a high voltage indicator with a high voltage plateau, where the high voltage plateau is between 0.5 and 2.0 V higher than a working voltage of the cell;

    M′



    is one or more of Ti, Zr and Mg, wherein M′



    is a low voltage indicator with a low voltage plateau, where the low voltage plateau is between 0.1 and 0.7 V lower than a working voltage of the cell;

    M′

    is not the same as M″

    ;

    M″

    is not the same as M′



    ;

    0≦

    x≦

    0.1.2;

    0.5≦

    y≦

    0.95;

    0.05≦

    z≦

    0.2;

    0.025≦

    w≦

    0.25;

    0.8≦

    y+z+w≦

    1.2; and

    where the high voltage plateau of the high voltage indicator and the low voltage plateau of the low voltage indicator are different than the working voltage of the cell.

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