# US 11,078,086 B2 · Method for producing lithium hydroxide anhydride and rotary kiln to be used therefor

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- Number: US 11,078,086 B2
- Document ID: US11078086B2
- Status: Granted
- Kind: B2
- Application number: 16/346,319
- Filed: 2017-10-31
- Published: 2020-02-20
- Granted: 2021-08-03
- Earliest claimed: 2016-11-01
- Assignees: BASF Toda Battery Materials LLC; Tanabe Corporation
- Applicants: BASF Toda Battery Materials LLC; Tanabe Corporation
- Inventors: Manabu Yamamoto; Osamu Sasaki; Noriyasu Kimura; Kenichi Nishimura; Wataru Koyanagi; Toru Kuwahara
- Web page: https://patentgrep.com/patent/US11078086B2

## CPC

- C01D 15/02: Oxides; Hydroxides
- F27B 7/08: externally heated
- F27B 7/36: Arrangements of air or gas supply devices
- F27B 7/362: {Introducing gas into the drum axially or through the wall}
- F27D 7/06: Forming or maintaining special atmospheres or vacuum within heating chambers (supplying steam, vapour, gases or liquids F27D7/02)
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- F27B 2007/365: {longitudinally}
- H01M 4/36: Selection of substances as active materials, active masses, active liquids
- H01M 2004/028: {Positive electrodes}
- 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)
- F27B: FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY

## Abstract

The object of the present invention is to improve production efficiency of lithium hydroxide anhydride in a method for producing lithium hydroxide anhydride from lithium hydroxide hydrate by using a rotary kiln. The method for producing lithium hydroxide anhydride comprises steps of: supplying the lithium hydroxide hydrate to a region between a heating part which is the part of the furnace core tube surrounded by the heating furnace and one end of the furnace core tube; delivering the supplied lithium hydroxide hydrate toward the other end of the furnace core tube; feeding a drying gas with a temperature of 100° C. or higher to the region between the one end and the heating part of the furnace core tube, when the lithium hydroxide hydrate is supplied; and heating and dehydrating the lithium hydroxide hydrate by the heating furnace which is set to 230-450° C. during the lithium hydroxide delivering step, to form lithium hydroxide anhydride.

## Claims

### Claim 1

A method for producing lithium hydroxide anhydride from lithium hydroxide hydrate by using a rotary kiln which has a furnace core tube and a heating furnace surrounding a certain part of the furnace core tube in the axial direction, wherein the method comprises the steps of:
supplying the lithium hydroxide hydrate to a region between a heating part which is the part of the furnace core tube surrounded by the heating furnace and one end of the furnace core tube;
delivering the supplied lithium hydroxide hydrate toward the other end of the furnace core tube;
feeding a drying gas with a temperature of 100° C. or higher to the region between the one end and the heating part of the furnace core tube, when the lithium hydroxide hydrate is supplied; and
heating and dehydrating the lithium hydroxide hydrate by the heating furnace which is set to 230-450° C. during the lithium hydroxide delivering step, to form lithium hydroxide anhydride.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the amount of the supplied lithium hydroxide hydrate is from 5 to 15% by volume, based on the volume of the furnace core tube.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the time for heating the lithium hydroxide in the heating part of the furnace core tube is from 30 min to 2 hours.

### Claim 4 (depends on 1)

The method according to claim 1, wherein an insulating material is provided on the outside surface of a region between the one end and the heating part of the furnace core tube.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the rotary kiln comprises an exhaust pipe for discharging the heated drying gas to the outside of the furnace core tube,
wherein the method further comprises a step of discharging the heated drying gas to the outside of the furnace core tube via the exhaust pipe.