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Mixed metal olivine electrode materials for lithium ion batteries having improved specific capacity and energy density

  • US 9,178,215 B2
  • Filed: 08/25/2010
  • Issued: 11/03/2015
  • Est. Priority Date: 08/25/2009
  • Status: Active Grant
First Claim
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1. A positive electrode material, comprising:

  • an electroactive material having an overall composition comprising lithium (Li), iron (Fe), manganese (Mn), one or more dopants (D), and phosphate (PO4), wherein the amount of Fe+Mn+D=1.0;

    a ratio of an amount of Li;

    (Fe+Mn+D) ranges from greater than 1.0 to 1.05;

    a ratio of an amount of PO4;

    (Fe+Mn+D) ranges from greater than 1.0 to 1.025;

    D is one or more dopants each selected from the group consisting of cobalt (Co), nickel (Ni), vanadium (V), and niobium (Nb);

    an element amount of Mn ranges from 0.35 to 0.60;

    an amount of D ranges from about 0.001 to about 0.10; and

    the electroactive material comprises at least one phase having an olivine structure comprising said Li, Fe, Mn, D, and phosphate; and

    wherein the combination of the excess lithium with the amount of Mn has an energy density of at least 250 mWh/g and a specific capacity of at least 100 mAh/g at a 20C discharge rate during operation in a battery cell of the electroactive material.

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