Preparation method of platy aluminum-doped cobalt carbonate and use thereof

Patent metadata

Field	Value
Publication number	US-2023382760-A1
Application number	US-202318231805-A
Country	US
Kind code	A1
Filing date	Aug 9, 2023
Priority date	Aug 18, 2021
Publication date	Nov 30, 2023
Grant date	—

Abstract

The present disclosure discloses a preparation method of platy aluminum-doped cobalt carbonate and use thereof. The preparation method includes the following steps: S1: mixing a cobalt salt, an aluminum salt, and a polyhydroxy compound to prepare a mixed solution; S2: mixing the mixed solution with an ammonium bicarbonate solution, adjusting a pH, and heating and stirring to allow a reaction to obtain a seed crystal solution; and S3: adding the mixed solution and an ammonium bicarbonate solution to the seed crystal solution, adjusting a pH, and heating and stirring to allow a reaction, during which a solid content in a slurry is controlled at 20% to 40% until a particle size in the slurry grows to a target value; and separating out, washing, and drying a solid phase to obtain the platy aluminum-doped cobalt carbonate.

First claim

1 . A preparation method of platy aluminum-doped cobalt carbonate, comprising the following steps:
S 1 : mixing a cobalt salt, an aluminum salt, and a polyhydroxy compound to prepare a mixed solution; S 2 : mixing the mixed solution with an ammonium bicarbonate solution, adjusting pH, and heating and stirring to allow a reaction to obtain a seed crystal solution; and S 3 : adding the mixed solution and an ammonium bicarbonate solution to the seed crystal solution, adjusting pH, and heating and stirring a resulting slurry to allow a reaction, controlling a solid content in the slurry at 20%-40% during the reaction until a particle size in the slurry grows to a target value; and separating out a solid phase, washing, and drying to obtain the platy aluminum-doped cobalt carbonate.

2 . The preparation method according to claim 1 , wherein in S 1 , cobalt ion in the mixed solution has a concentration of 1.8-2.2 mol/L; and preferably, a mass ratio of aluminum to cobalt in the mixed solution is 0.005-0.01.

3 . The preparation method according to claim 1 , wherein in S 1 , the polyhydroxy compound in the mixed solution has a concentration of 0.01-0.015 mol/L; and preferably, the polyhydroxy compound is one or more selected from the group consisting of ethylene glycol, glycerol, pentaerythritol, glucose, and sucrose.

4 . The preparation method according to claim 1 , wherein in S 2 , the seed crystal has a particle size D50 of 2-8 μm.

5 . The preparation method according to claim 1 , wherein S 2 specifically comprises: adding an ammonium bicarbonate solution as a base solution to a reactor, heating and stirring, and feeding the mixed solution and an ammonium bicarbonate solution in concurrent flow to allow a reaction, adjusting a flow rate of the ammonium bicarbonate solution to control the pH of a resulting liquid during the reaction, and concentrating the liquid when the liquid level in the reactor reaches a desired value; performing the reaction until a particle size of a product grows to a target value to obtain a seed crystal.

6 . The preparation method according to claim 5 , wherein in S 2 , the base solution has a concentration of 0.8-1.6 mol/L; the ammonium bicarbonate solution fed concurrently with the mixed solution has a concentration of 2.0-3.0 mol/L, and is added at a flow rate of 10-15 L/h; and the mixed solution is added at a flow rate of 20 L/h to 30 L/h.

7 . The preparation method according to claim 1 , wherein in S 3 , the ammonium bicarbonate solution has a concentration of 2.0 3.0 mol/L, and is added at a flow rate of 40-60 L/h; and the mixed solution is added at a flow rate of 20-30 L/h.

8 . The preparation method according to claim 1 , wherein in S 3 , the pH is 7.2-7.4.

9 . The preparation method according to claim 1 , wherein in S 3 , the platy aluminum-doped cobalt carbonate has a particle size D50 of 10-18.

10 . Use of the preparation method according to claim 1 in the preparation of a lithium cobalt oxide cathode material.

11 . Use of the preparation method according to claim 2 in the preparation of a lithium cobalt oxide cathode material.

12 . Use of the preparation method according to claim 3 in the preparation of a lithium cobalt oxide cathode material.

13 . Use of the preparation method according to claim 4 in the preparation of a lithium cobalt oxide cathode material.

14 . Use of the preparation method according to claim 5 in the preparation of a lithium cobalt oxide cathode material.

15 . Use of the preparation method according to claim 6 in the preparation of a lithium cobalt oxide cathode material.

16 . Use of the preparation method according to claim 7 in the preparation of a lithium cobalt oxide cathode material.

17 . Use of the preparation method according to claim 8 in the preparation of a lithium cobalt oxide cathode material.

18 . Use of the preparation method according to claim 9 in the preparation of a lithium cobalt oxide cathode material.

Assignees

• Guangdong Brunp Recycling Technology Co Ltd
• Hunan Brunp Recycling Tech Co Ltd
• Hunan Brunp Ev Recycling Co Ltd

Inventors

• Lu Xinghua
• Li Changdong
• Ruan Dingshan
• Liu Genghao
• Cai Yong
• Li Bin

Classifications

• H01M4/36

  Selection of substances as active materials, active masses, active liquids · CPC title

• C01G51/42

  containing alkali metals, e.g. LiCoO2 · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• C01G51/06 Primary

  Carbonates · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title