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Method of reclaiming cathodic active material of lithium ion secondary battery

  • US 6,261,712 B1
  • Filed: 06/23/1999
  • Issued: 07/17/2001
  • Est. Priority Date: 06/30/1998
  • Status: Expired due to Fees
First Claim
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1. A method of reclaiming a cathodic active material of a lithium ion secondary battery having a casing and a content, said content comprising a cathodic active material represented by the formula LiMO2, wherein M is a transition metal, comprising the steps of:

  • breaking the lithium ion secondary battery and separating the casing and the content to remove the casing from the content;

    dissolving the content into a mineral acid to separate a remaining non-dissolved content from the mineral acid, thereby obtaining a liquid comprising the cathodic active material;

    adding a lithium salt to the liquid; and

    recovering the cathodic active material from the liquid by producing a precipitate comprising lithium and the transition metal of the cathodic active material from the liquid; and

    separating and calcining the precipitate to reclaim a cathodic active material.

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