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Title:
METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2024/048590
Kind Code:
A1
Abstract:
This method for producing a positive electrode active material comprises the steps described below. (1) A mixture is obtained by mixing an activation agent which contains one or more alkali metal compounds into an electrode mixture which contains a positive electrode active material, a binder and an electrolyte, and from which at least some of the electrolyte is removed by means of a contact with an electrolyte cleaning solvent. (2) The mixture is heated to a retention temperature that is not less than the melting initiation temperature of the activation agent. (3) The mixture after the step (2) is brought into contact with a liquid that contains water, thereby obtaining a slurry that contains a solid component and a liquid component, and subsequently, the slurry is separated into the solid component and the liquid component. (4) The thus-obtained solid component is exposed to heat and/or a reduced pressure environment, thereby removing water from the solid component, and within 24 hours from the separation of the slurry into the solid component and the liquid component, the ambient pressure at which the solid component is present and/or the temperature of the solid component is changed so that the ratio of the saturated water vapor pressure at the temperature of the solid component to the ambient pressure is 80% or more. (5) The solid component after the step (4) is subjected to a heat treatment at less than 900°C.

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Inventors:
TAKIGUCHI TAKEMOTO MARIE (JP)
SHIMANO SATOSHI (JP)
Application Number:
PCT/JP2023/031248
Publication Date:
March 07, 2024
Filing Date:
August 29, 2023
Export Citation:
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Assignee:
SUMITOMO CHEMICAL CO (JP)
UNIV KYOTO (JP)
International Classes:
H01M10/54; C22B7/00; H01M4/505; H01M4/525
Foreign References:
JP2012186150A2012-09-27
JP2021140996A2021-09-16
JP2005353584A2005-12-22
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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