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Lithiated manganese oxide

  • US 5,759,510 A
  • Filed: 10/03/1996
  • Issued: 06/02/1998
  • Est. Priority Date: 10/03/1996
  • Status: Expired due to Term
First Claim
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1. A method for making lithiated manganese oxide, the method comprising:

  • providing amorphous manganese dioxide which includes an alkali metal selected from the group consisting of sodium, potassium and mixtures thereof;

    blending the amorphous manganese dioxide with a lithium compound to provide a lithium compound/manganese dioxide blend, the lithium compound being in molar excess of at least about 1.6 moles of lithium compound per mole of manganese dioxide;

    calcining the lithium compound/manganese dioxide blend at from about 150°

    to about 550°

    C. for about 2 to about 72 hours to provide an initially calcined lithium/manganese complex;

    washing the initially calcined lithium/manganese complex with aqueous lithium hydroxide to provide a washed initially calcined lithium/manganese complex, the washing being effective to provide the washed initially calcined lithium/manganese complex which when slurried with water at a ratio of about 1 part complex to about 3 parts water will result in an aqueous slurry with a pH in the range of from about 11 to about 13;

    slurrying the washed initially calcined lithium/manganese complex with water to provide an aqueous slurry and adjusting the pH of the aqueous slurry of the washed lithium/manganese complex to a pH of less than about 7, the pH adjustment effective to provide a lithium/manganese complex which when calcined will provide a lithiated manganese compound having the formula Lix Mn2 O4 where x is greater than 0 and less than about 2; and

    calcining the lithium/manganese complex from about 500°

    to about 900°

    C. for a time effective to provide the lithiated manganese compound having the formula Lix Mn2 O4 where x is greater than 0 and less than about 2.

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