Title:
METHOD FOR RECOVERING LITHIUM FROM WASTE LITHIUM-ION BATTERIES
Document Type and Number:
WIPO Patent Application WO/2023/054667
Kind Code:
A1
Abstract:
Provided is a method for recovering lithium from waste lithium-ion batteries, that facilitates lithium recovery at a high recovery rate and facilitates recycling of resources. In this method for recovering lithium from waste lithium-ion batteries: active material powder obtained by preprocessing waste lithium-ion batteries is dissolved in a mineral acid; alkali metal hydroxide is added to the obtained acid solution; then at least one type of metal excluding lithium, out of the metals included in the active material powder, is separated by solvent extraction; and a first aqueous solution of an alkali metal salt is obtained. The first aqueous solution of an alkali metal salt is electrolyzed using an ion exchange membrane. An aqueous solution of alkali metal hydroxide obtained by electrolysis is either used as an alkali metal hydroxide to be added to acid solutions or is used in solvent extraction. The acid obtained by electrolysis is used as a mineral acid.
Inventors:
YAMADA KEITA (JP)
SAKUMA YUKIO (JP)
HIRAOKA TARO (JP)
SAKUMA YUKIO (JP)
HIRAOKA TARO (JP)
Application Number:
PCT/JP2022/036663
Publication Date:
April 06, 2023
Filing Date:
September 30, 2022
Export Citation:
Assignee:
ASAKA RIKEN CO LTD (JP)
International Classes:
C22B7/00; B09B5/00; C22B3/06; C22B3/20; C22B3/22; C22B3/26; C22B3/44; C22B23/00; C22B26/12; C22B47/00; C25C3/02; H01M10/54
Domestic Patent References:
| WO2020092157A1 | 2020-05-07 |
Foreign References:
| JP2003157913A | 2003-05-30 | |||
| JP2001508925A | 2001-07-03 | |||
| JP2018502995A | 2018-02-01 | |||
| US20140227154A1 | 2014-08-14 | |||
| CN111778401A | 2020-10-16 | |||
| JP6835820B2 | 2021-02-24 | |||
| JP6869444B1 | 2021-05-12 |
Attorney, Agent or Firm:
SATO & ASSOCIATES (JP)
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