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Processes for making dense, spherical active materials for lithium-ion cells

  • US 8,062,792 B2
  • Filed: 04/25/2006
  • Issued: 11/22/2011
  • Est. Priority Date: 04/26/2005
  • Status: Active Grant
First Claim
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1. A method comprising:

  • precipitating spherical particles comprising one or more metal carbonates or one or more metal phosphates from a combined aqueous solution comprising a precipitating agent, wherein;

    the precipitating agent is selected from ammonium hydrogen carbonate, sodium hydrogen carbonate, or a mixture comprising sodium hydrogen carbonate when the spherical particles are the one or more metal carbonates and the metal carbonates are selected from the group consisting of (Niα

    Coβ

    Mnγ

    Me′

    δ

    )CO3, wherein Me′

    is selected from the group consisting of Fe, Ag, Cu, Zn, or Mg;

    0<

    α



    1, 0<

    β



    1, 0<

    γ



    1, and 0≦

    δ



    1; and

    the sum of α

    , β

    , γ

    , and δ

    is 1;

    orthe precipitating agent is ammonium hydrogen phosphate, ammonium dihydrogen phosphate, sodium phosphate, sodium hydrogen phosphate, sodium dihydrogen phosphate, or a mixture comprising any two or more thereof when the spherical particles are the one or more metal phosphates wherein the metal phosphates are selected from the group consisting of (Niα



    Coβ



    Mnγ



    Feδ

    )(PO4);

    wherein 0≦

    α





    1, 0≦

    β





    1, 0≦

    γ





    1, and 0≦

    δ



    1; and

    where the sum of α



    , β



    , γ



    , and δ

    is 1.

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