# US 12,767,548 B2 · Method for producing lithium hydroxide

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- Number: US 12,767,548 B2
- Document ID: US12767548B2
- Status: Granted
- Kind: B2
- Application number: 18/251,338
- Filed: 2021-11-05
- Published: 2023-12-21
- Granted: 2026-10-20
- Earliest claimed: 2020-11-06
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co., Ltd.
- Inventors: Daisuke Mori; Masashi Machida; Futoshi Utsuno; Tsuyoshi Hoshino
- Web page: https://patentgrep.com/patent/US12767548B2

## CPC

- C01D 15/02: Oxides; Hydroxides
- B01D 9/0004: {cooling by heat exchange (by evaporation of components of the mixture to be separated B01D9/0013; refrigeration machines F25B)}
- B01D 9/0022: {by reducing pressure}
- C22B 3/22: by physical processes, e.g. by filtration, by magnetic means {, or by thermal decomposition} (treatment or purification of solutions by liquid-liquid extraction C22B3/26)
- C22B 26/12: Obtaining lithium
- H01M 10/54: Reclaiming serviceable parts of waste accumulators
- C01P 2006/40: Electric properties
- C01D: COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides C01B17/22; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia and cyanogen, containing nitrogen and other non-metals C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; phosphides C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

Provided is a lithium hydroxide production method for producing high-purity lithium hydroxide efficiently and at a lower energy, wherein Li ions alone are recovered in a recovery liquid from a lithium ion extract extracted from a processed member of a lithium secondary battery, using a Li permselective membrane, and lithium hydroxide is produced from the recovery liquid.

## Claims

### Claim 1

A method for producing lithium hydroxide, comprising recovering Li ions alone in a recovery liquid from a lithium ion extract extracted from a processed member of a lithium secondary battery, using a Li permselective membrane, and producing lithium hydroxide from the recovery liquid, wherein:
the Li ions are recovered while a temperature of the recovery liquid is controlled at 50° C. or higher,
lithium hydroxide is separated from the recovery liquid by cooling crystallization, and
the cooling crystallization is performed with maintaining a positive pressure by blowing an inert gas into the recovery liquid for the crystallization.

### Claim 2 (depends on 1)

The lithium hydroxide production method according to claim 1, wherein the temperature is 80° C. or higher and 100° C. or lower.

### Claim 3 (depends on 1)

The lithium hydroxide production method according to claim 1, wherein the cooling crystallization is performed while the temperature of the recovery liquid for the crystallization is controlled at 40° C. or lower.

### Claim 4 (depends on 1)

The lithium hydroxide production method according to claim 1, including adding the filtrate formed in the crystallization to the recovery liquid.

### Claim 5 (depends on 4)

The lithium hydroxide production method according to claim 4, wherein the filtrate is heated.

### Claim 6 (depends on 4)

The lithium hydroxide production method according to claim 4, wherein impurities are not removed in adding the filtrate to the recovery liquid.

### Claim 7 (depends on 1)

The lithium hydroxide production method according to claim 1, wherein the Li permselective membrane contains a Li-containing oxide or oxynitride.