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Method of manufacturing a positive electrode active material for lithium secondary batteries

  • US 10,442,699 B2
  • Filed: 12/19/2011
  • Issued: 10/15/2019
  • Est. Priority Date: 12/28/2010
  • Status: Active Grant
First Claim
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1. A method for producing a positive electrode active material for lithium secondary batteries, the method consisting of washing a powder of a spinel type (Fd-3m) lithium transition metal oxide having an operating potential of about 5 V by substituting a portion of the Mn sites in LiMn2O4 with another 3d transition metal into contact with water and thereby forming a slurry;

  • feeding the slurry thus obtained into a wet type magnetic separator, collecting magnetic substances that have attached to a magnet, and thereby removing the magnetic substances;

    filtrating the slurry after collecting magnetic substances to form a filtered composition;

    heating and drying to remove moisture in a single process in which heating the filtered composition to 300°

    C. or higher and less than 700°

    C. in an atmosphere containing oxygen while water vapor is exhausting at an average water vapor exhaust rate of 0.5 g/sec to 300 g/sec, wherein, after contact with the water, the slurry or the filtered composition is not heated to 700°

    C. or higher.

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