Method for forming positive electrode active material

Patent metadata

Field	Value
Publication number	US-2026051492-A1
Application number	US-202519298246-A
Country	US
Kind code	A1
Filing date	Aug 13, 2025
Priority date	Apr 5, 2019
Publication date	Feb 19, 2026
Grant date	—

Abstract

A method for forming a positive electrode active material of a lithium ion secondary battery is provided. In the method for forming a positive electrode active material, a first container that includes a mixture of lithium oxide, fluoride, and a magnesium compound and fluoride that is outside the first container are provided in a heating furnace, and the heating furnace is heated at a temperature higher than or equal to a temperature at which the fluoride is volatilized or sublimated. It is further preferable that the fluoride be lithium fluoride and the magnesium compound be magnesium fluoride.

First claim

1 . (canceled)

2 . A method for forming a positive electrode active material, comprising:
heating a heating furnace, wherein a first container and a first fluoride which is outside the first container are placed in the heating furnace when the heating furnace is heated, wherein the first container includes a mixture of lithium cobalt oxide, a second fluoride, a magnesium compound, and an aluminum compound, and wherein a temperature when the heating furnace is heated is higher than or equal to a temperature at which at least one of the first fluoride or the second fluoride is volatilized or sublimated.

3 . The method for forming a positive electrode active material according to claim 2 , wherein the first fluoride is lithium fluoride and the second fluoride is lithium fluoride.

4 . The method for forming a positive electrode active material according to claim 2 ,
wherein the first container further comprises a nickel compound.

5 . The method for forming a positive electrode active material according to claim 2 ,
wherein the heating furnace is heated at higher than or equal to 730° C. and lower than or equal to 1130° C.

6 . The method for forming a positive electrode active material according to claim 2 , wherein the magnesium compound is magnesium fluoride.

7 . The method for forming a positive electrode active material according to claim 2 , wherein the heating furnace is heated after an atmosphere in the heating furnace is replaced with oxygen.

8 . A method for forming a positive electrode active material, comprising:
heating a heating furnace, wherein a first container and a second container are placed in the heating furnace when the heating furnace is heated, wherein the first container includes a mixture of lithium cobalt oxide, a first fluoride, a magnesium compound, and an aluminum compound, wherein the second container includes a second fluoride, and wherein a temperature when the heating furnace is heated is higher than or equal to a temperature at which at least one of the first fluoride or the second fluoride is volatilized or sublimated.

9 . The method for forming a positive electrode active material according to claim 8 ,
wherein the first container further comprises a nickel compound.

10 . The method for forming a positive electrode active material according to claim 8 ,
wherein the heating furnace is heated at higher than or equal to 730° C. and lower than or equal to 1130° C.

11 . The method for forming a positive electrode active material according to claim 8 , wherein the magnesium compound is magnesium fluoride.

12 . The method for forming a positive electrode active material according to claim 8 , wherein the heating furnace is heated after an atmosphere in the heating furnace is replaced with oxygen.

13 . A method for forming a positive electrode active material, comprising:
heating a heating furnace, wherein a first container is placed in the heating furnace when the heating furnace is heated, wherein the first container comprises a first space, a second space, and a divider between the first space and the second space, wherein the first space includes a mixture of lithium cobalt oxide, a first fluoride, and a magnesium compound, wherein the second space includes a second fluoride, and wherein a temperature when the heating furnace is heated is higher than or equal to a temperature at which at least one of the first fluoride or the second fluoride is volatilized or sublimated.

14 . The method for forming a positive electrode active material according to claim 13 ,
wherein the first space further comprises an aluminum compound.

15 . The method for forming a positive electrode active material according to claim 13 ,
wherein the first space further comprises a nickel compound.

16 . The method for forming a positive electrode active material according to claim 13 , wherein the first fluoride is lithium fluoride and the second fluoride is lithium fluoride.

17 . The method for forming a positive electrode active material according to claim 13 ,
wherein the heating furnace is heated at higher than or equal to 730° C. and lower than or equal to 1130° C.

18 . The method for forming a positive electrode active material according to claim 13 , wherein the magnesium compound is magnesium fluoride.

19 . The method for forming a positive electrode active material according to claim 13 , wherein the heating furnace is heated after an atmosphere in the heating furnace is replaced with oxygen.

Assignees

• Semiconductor Energy Lab

Inventors

• Momma Yohei
• Ochiai Teruaki
• Mikami Mayumi
• Saito Jo
• Takahashi Masahiro

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• C01P2006/40

  Electric properties · CPC title