IP Library › Granted Patent US 12,244,007
Granted Patent B2
US 12,244,007 · App. 18/608,249 · Granted Mar 4, 2025

Positive electrode active material, secondary battery, and electronic device

Inventors: Yohei Momma (Kanagawa, JP); Hiroshi Kadoma (Kanagawa, JP); Yoshihiro Komatsu (Kanagawa, JP); Shiori Saga (Kanagawa, JP); Shunpei Yamazaki (Tokyo, JP)
Assignee: Semiconductor Energy Laboratory Co., Ltd.
H01M4/366H01M4/485H01M4/525H01M4/582H01M10/0525H01M2004/028
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Quick Facts
Patent No.
US 12,244,007
App. No.
18/608,249
Granted
Mar 4, 2025
Kind
B2
Abstract

A positive electrode active material in which a capacity decrease caused by charge and discharge cycles is suppressed is provided. Alternatively, a positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. The positive electrode active material contains titanium, nickel, aluminum, magnesium, and fluorine, and includes a region where titanium is unevenly distributed, a region where nickel is unevenly distributed, and a region where magnesium is unevenly distributed in a projection on its surface. Aluminum is preferably unevenly distributed in a surface portion, not in the projection, of the positive electrode active material.

Claims (39)

1. A positive electrode active material comprising a particle comprising oxygen, cobalt, lithium, magnesium, titanium, nickel, aluminum, and fluorine,

wherein the particle comprises a superficial portion, an inner portion, a depression, and a projection on the superficial portion,

wherein the particle comprises a region where a titanium concentration in the depression is higher than a titanium concentration in the superficial portion,

wherein the particle comprises a region where a titanium concentration in the projection is higher than the titanium concentration in the superficial portion,

wherein the particle comprises a region where a magnesium concentration in the projection is higher than a magnesium concentration in the superficial portion,

wherein the particle comprises a region where a nickel concentration in the projection is higher than a nickel concentration in the superficial portion,

wherein the particle comprises a region where a fluorine concentration in the projection in the projection is higher than a fluorine concentration in the superficial portion, and

wherein the particle comprises a region where an aluminum concentration in the superficial portion is higher than an aluminum concentration in the projection.

2. The positive electrode active material according to claim 1 ,

wherein the particle comprises a region where a magnesium concentration in the depression is higher than the magnesium concentration in the superficial portion, and

wherein the particle comprises a region where a fluorine concentration in the depression is higher than the fluorine concentration in the superficial portion.

3. The positive electrode active material according to claim 1 ,

wherein the depression comprises a portion,

wherein a depth of the portion is more than 100 nm, and

wherein a width of the portion is more than 20 nm.

4. The positive electrode active material according to claim 1 ,

wherein the projection comprises a portion, and

wherein a height of the projection is greater than 50 nm.

5. The positive electrode active material according to claim 1 , wherein the particle comprises a region where a cobalt concentration in the projection is lower than a cobalt concentration in the inner portion.

6. A secondary battery comprising the positive electrode active material according to claim 1 .

7. An electronic device comprising the secondary battery according to claim 6 .

8. A positive electrode active material comprising a particle comprising oxygen, cobalt, lithium, magnesium, titanium, nickel, aluminum, and fluorine,

wherein the particle comprises a superficial portion, an inner portion, a depression, and a projection on the superficial portion,

wherein the particle comprises a region where a titanium concentration in the depression is higher than a titanium concentration in the inner portion,

wherein the particle comprises a region where a titanium concentration in the projection is higher than the titanium concentration in the inner portion,

wherein the particle comprises a region where a magnesium concentration in the projection is higher than a magnesium concentration in the inner portion,

wherein the particle comprises a region where a nickel concentration in the projection is higher than a nickel concentration in the inner portion,

wherein the particle comprises a region where a fluorine concentration in the projection is higher than a fluorine concentration in the inner portion, and

wherein the particle comprises a region where an aluminum concentration in the superficial portion is higher than an aluminum concentration in the projection.

9. The positive electrode active material according to claim 8 ,

wherein the depression comprises a portion,

wherein a depth of the portion is greater than 100 nm, and

wherein a width of the portion is greater than 20 nm.

10. The positive electrode active material according to claim 8 ,

wherein the projection comprises a portion, and

wherein a height of the projection is greater than 50 nm.

11. The positive electrode active material according to claim 8 , wherein the particle comprises a region where a cobalt concentration in the projection is lower than a cobalt concentration in the inner portion.

12. A secondary battery comprising the positive electrode active material according to claim 8 .

13. An electronic device comprising the secondary battery according to claim 12 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 18, 2024
From: MOMMA, YOHEI; KADOMA, HIROSHI; KOMATSU, YOSHIHIRO; SAGA, SHIORI; YAMAZAKI, SHUNPEI
To: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Reel/Frame 066814/0624 →
Priority Claims (2)
JP 2019-215105 · Nov 28, 2019 · national
JP 2019-222975 · Dec 10, 2019 · national
Continuity (2)
Continuation 16952189 · Nov 19, 2020
Related Publication 20240266515A1 · Aug 8, 2024
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