IP Library › Granted Patent US 12,651,746
Granted Patent B2
US 12,651,746 · App. 17/312,082 · Granted Jun 9, 2026

Positive electrode active material, method for manufacturing the same, and secondary battery

Inventors: Yohei Momma (Kanagawa, JP); Jyo Saito (Kanagawa, JP); Teruaki Ochiai (Kanagawa, JP); Kazuhei Narita (Tokyo, JP); Kazuhito Machikawa (Kanagawa, JP); Mayumi Mikami (Kanagawa, JP)
Assignee: Semiconductor Energy Laboratory Co., Ltd.
H01M4/525C01G53/42H01M4/364H01M10/0525C01P2002/72C01P2002/77C01P2004/03C01P2004/61C01P2006/40H01M2004/028
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Quick Facts
Patent No.
US 12,651,746
App. No.
17/312,082
Granted
Jun 9, 2026
Kind
B2
Abstract

An object is to provide a method for manufacturing a positive electrode active material that achieves high powder properties and high load resistance (e.g., rate performance and output resistance) when used in a lithium-ion secondary battery, within a short manufacturing cycle time and at low cost. To perform heat treatment at temperatures lower than the melting point of magnesium fluorine, lithium fluoride is mixed to melt magnesium fluorine and modify the surface of lithium cobalt oxide powder. By mixing lithium fluoride, magnesium fluorine can be melted at a temperature lower than its melting point, and a positive electrode active material is formed utilizing this eutectic phenomenon.

Claims (12)

1 . A method for manufacturing a positive electrode active material, comprising:

pulverizing each of magnesium fluoride, lithium fluoride, a nickel source, and an aluminum source;

after the pulverizing, forming a mixture by mixing the pulverized magnesium fluoride, the pulverized lithium fluoride, the pulverized nickel source, the pulverized aluminum source, and a powder of lithium cobalt oxide; and

forming the positive electrode active material by heating the mixture at a temperature lower than an upper temperature limit of the lithium cobalt oxide.

2 . The method for manufacturing a positive electrode active material, according to claim 1 , wherein the temperature is higher than or equal to 700° C. and lower than or equal to 950° C.

3 . The method for manufacturing a positive electrode active material according to claim 1 , wherein the aluminum source is one of aluminum hydroxide and aluminum isopropoxide.

4 . The method for manufacturing a positive electrode active material according to claim 1 , wherein the nickel source is nickel hydroxide.

5 . The method for manufacturing a positive electrode active material according to claim 1 , wherein the positive electrode active material has an average particle diameter greater than or equal to 1 μm and less than or equal to 100 μm.

6 . The method for manufacturing a positive electrode active material according to claim 1 , wherein in the positive electrode active material, a number of aluminum atoms is 0.05% to 4% the number of cobalt atoms.

7 . The method for manufacturing a positive electrode active material according to claim 1 , wherein the pulverizing comprises pulverizing magnesium fluoride and lithium fluoride together at the same time.

8 . The method for manufacturing a positive electrode active material according to claim 1 , wherein the pulverizing comprises pulverizing the nickel source separately from each of the lithium fluoride, the magnesium fluoride, and the aluminum source.

9 . The method for manufacturing a positive electrode active material according to claim 1 , wherein the pulverizing comprises pulverizing the aluminum source separately from each of the lithium fluoride, the magnesium fluoride, and the nickel source.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 17, 2022
From: MOMMA, YOHEI; SAITO, JYO; OCHIAI, TERUAKI; NARITA, KAZUHEI; MACHIKAWA, KAZUHITO; MIKAMI, MAYUMI
To: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Reel/Frame 059289/0698 →
Priority Claims (4)
JP 2018-233928 · Dec 13, 2018 · national
JP 2018-238383 · Dec 20, 2018 · national
JP 2019-019437 · Feb 6, 2019 · national
JP 2019-031705 · Feb 25, 2019 · national
Continuity (1)
Related Publication 20220029159A1 · Jan 27, 2022
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