Preparation method of tin-based lithium cobaltate precursor and use thereof

Patent metadata

Field	Value
Publication number	US-12095085-B2
Application number	US-202218284770-A
Country	US
Kind code	B2
Filing date	Nov 14, 2022
Priority date	Mar 17, 2022
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

The present disclosure discloses a preparation method of a tin-based lithium cobaltate precursor and use thereof. The method involves adding a cobalt salt solution, a precipitant and a complexing agent for reaction to obtain a precipitate, wherein the precipitant is a mixed solution of carbonate and stannate; calcining the precipitate; and mixing the calcined material with dioxane, ball-milling the mixture, and subjecting the ball-milled product to a heating and pressurization treatment to obtain the tin-based lithium cobaltate precursor. In the present disclosure, after carbonate and stannate are blended, the blend react with cobalt salt to form the co-precipitate of cobalt carbonate and cobalt stannate, and after calcination, a mixture of cobalt(II,III) oxide and tin dioxide is formed. By utilizing dioxane for solvent hot pressing, particles are bonded to each other, forming grain boundary channels. In addition, by doping with tin, the conductivity of the material is improved.

First claim

The invention claimed is:

1. A preparation method of a tin doped lithium cobaltate precursor, comprising the following steps:
S1: adding a cobalt salt solution, a precipitant and a complexing agent concurrently for reaction, and after the reaction is completed, performing solid-liquid separation to obtain a precipitate, wherein the precipitant is a mixed solution of carbonate and stannate, wherein the carbonate is sodium carbonate, and the stannate is sodium stannate;
S2: first calcining the precipitate in an inert atmosphere, and then calcining the precipitate in an oxidizing atmosphere to obtain a calcined material; and
S3: mixing the calcined material with dioxane, ball-milling a resulting mixture to obtain a ball-milled product, and subjecting the ball-milled product to a heating and pressurization treatment to obtain the tin doped lithium cobaltate precursor.

2. The preparation method according to claim 1 , wherein in step S1, a concentration of the cobalt salt solution is 1.0 mol/L to 2.0 mol/L.

3. The preparation method according to claim 1 , wherein in step S1, in the precipitant, a concentration of the carbonate is 1.0 mol/L to 2.0 mol/L and a concentration of the stannate is 0.05 mol/L to 0.2 mol/L.

4. The preparation method according to claim 1 , wherein in step S1, the complexing agent is aqueous ammonia, and the aqueous ammonia has a concentration of 6.0 mol/L to 12.0 mol/L.

5. The preparation method according to claim 1 , wherein in step S1, the reaction is conducted at a temperature of 70° C. to 80° C.

6. The preparation method according to claim 1 , wherein in step S1, the precipitate has a particle size D50 of 4.0 μm to 8.0 μm.

7. The preparation method according to claim 1 , wherein in step S3, a ratio of a mass of the calcined material to a volume of dioxane is (3-5) g:5 mL.

8. The preparation method according to claim 1 , wherein in step S3, the heating involves first heating to 100° C. to 110° C. and maintaining such heating temperature for a duration of 0.5 h-1 h, and then heating to 200° C. to 220° C. and maintaining such heating temperature for a duration of 3 h-5 h.

Assignees

• Yichang Brunp Contemporary Amperex Co Ltd
• Guangdong Brunp Recycling Technology Co Ltd
• Hunan Brunp Recycling Tech Co Ltd

Inventors

• Yu Haijun
• Xie Yinghao
• Li Aixia
• Zhang Xuemei
• Li Changdong

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01G51/42 Primary

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