Title:
METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY AND HEAT TREATMENT APPARATUS
Document Type and Number:
WIPO Patent Application WO/2019/103046
Kind Code:
A1
Abstract:
The present invention provides a method for producing a positive electrode active material for a lithium ion secondary battery capable of producing a positive electrode active material for a lithium ion secondary battery having high crystalline purity and high capacity by performing calcination while suppressing production costs, and also provides a heat treatment apparatus. The method for manufacturing a positive electrode active material for a lithium ion secondary battery includes a mixing step (S10) of mixing lithium carbonate and a compound including a metal element other than Li and a calcining step (S20). The calcining step (S20) includes two or more stages controlled to mutually different heat treatment temperatures, and in the stage controlled to a low temperature, the calcination is performed by controlling oxygen concentration to a level lower than that in the stage controlled to a high temperature. The heat treatment apparatus (1) comprises two or more calcination furnaces (10A, 10B) controlled to mutually different heat treatment temperatures, and a gas outlet of the calcination furnace (10B) controlled to a high temperature communicates with the calcination furnace (10A) controlled to a low temperature.
Inventors:
GUNJI AKIRA (JP)
TOYAMA TATSUYA (JP)
TAKEUCHI AKIO (JP)
TOKORO HISATO (JP)
TAKANO SHUICHI (JP)
NAKAJIMA GENEI (JP)
TOYAMA TATSUYA (JP)
TAKEUCHI AKIO (JP)
TOKORO HISATO (JP)
TAKANO SHUICHI (JP)
NAKAJIMA GENEI (JP)
Application Number:
PCT/JP2018/043020
Publication Date:
May 31, 2019
Filing Date:
November 21, 2018
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01M4/525; C01G53/00
Domestic Patent References:
| WO2009098835A1 | 2009-08-13 | |||
| WO2017221554A1 | 2017-12-28 | |||
| WO2018070517A1 | 2018-04-19 |
Foreign References:
| JP2016110982A | 2016-06-20 |
Attorney, Agent or Firm:
ISONO INTERNATIONAL PATENT OFFICE, P.C. (JP)
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