Positive Electrode Active Material Particle and Method for Manufacturing Positive Electrode Active Material Particle

Patent metadata

Field	Value
Publication number	US-2025349879-A1
Application number	US-202519090705-A
Country	US
Kind code	A1
Filing date	Mar 26, 2025
Priority date	Nov 24, 2016
Publication date	Nov 13, 2025
Grant date	—

Abstract

Positive electrode active material particles that inhibit a decrease in capacity due to charge and discharge cycles are provided. A high-capacity secondary battery, a secondary battery with excellent charge and discharge characteristics, or a highly-safe or highly-reliable secondary battery is provided. A novel material, active material particles, and a storage device are provided. The positive electrode active material particle includes a first region and a second region in contact with the outside of the first region. The first region contains lithium, oxygen, and an element M that is one or more elements selected from cobalt, manganese, and nickel. The second region contains the element M, oxygen, magnesium, and fluorine. The atomic ratio of lithium to the element M (Li/M) measured by X-ray photoelectron spectroscopy is 0.5 or more and 0.85 or less. The atomic ratio of magnesium to the element M (Mg/M) is 0.2 or more and 0.5 or less.

First claim

1 . (canceled)

2 . A positive electrode active material of a lithium-ion secondary battery, the positive electrode active material comprising lithium cobaltate,
wherein the positive electrode active material comprises:
a first region comprising a layered rock-salt crystal structure, the first region comprising cobalt and aluminum; and
a second region comprising a rock-salt crystal structure, the second region comprising magnesium and covering at least part of the first region;
wherein a thickness of the second region is greater than or equal to 0.5 nm and less than or equal to 50 nm.

3 . A positive electrode active material of a lithium-ion secondary battery, the positive electrode active material comprising lithium cobaltate,
wherein the positive electrode active material comprises:
a first region comprising a layered rock-salt crystal structure, the first region comprising cobalt and aluminum; and
a second region comprising a rock-salt crystal structure, the second region comprising magnesium and covering at least part of the first region;
wherein a crystal orientation of the layered rock-salt crystal structure and a crystal orientation of the rock-salt crystal structure are substantially aligned with each other, wherein an atomic ratio of the magnesium to the cobalt measured by X-ray photoelectron spectroscopy is higher than or equal to 0.25 and lower than or equal to 0.3, and wherein a thickness of the second region is greater than or equal to 0.5 nm and less than or equal to 50 nm.

4 . A positive electrode active material of a lithium-ion secondary battery, the positive electrode active material comprising lithium cobaltate,
wherein the positive electrode active material comprises:
a first region comprising a layered rock-salt crystal structure, the first region comprising cobalt and aluminum; and
a second region comprising a rock-salt crystal structure, the second region comprising magnesium and covering at least part of the first region;
wherein an atomic ratio of the magnesium to the cobalt measured by X-ray photoelectron spectroscopy is higher than or equal to 0.25 and lower than or equal to 0.3, and wherein a thickness of the second region is greater than or equal to 0.5 nm and less than or equal to 50 nm.

5 . The positive electrode active material according to claim 3 , wherein an atomic ratio of the lithium to the cobalt measured by X-ray photoelectron spectroscopy is higher than or equal to 0.5 and lower than or equal to 0.85.

6 . The positive electrode active material according to claim 4 , wherein an atomic ratio of the lithium to the cobalt measured by X-ray photoelectron spectroscopy is higher than or equal to 0.5 and lower than or equal to 0.85.

7 . The positive electrode active material of the lithium-ion secondary battery according to claim 3 , wherein the second region further comprises fluorine.

8 . The positive electrode active material of the lithium-ion secondary battery according to claim 4 , wherein the second region further comprises fluorine.

9 . The positive electrode active material of the lithium-ion secondary battery according to claim 2 ,
wherein the second region further comprises fluorine, and wherein an atomic ratio of the fluorine to the cobalt measured by X-ray photoelectron spectroscopy is higher than or equal to 0.05 and lower than or equal to 0.15.

10 . A lithium-ion secondary battery comprising a positive electrode and a negative electrode,
wherein the positive electrode comprises a positive electrode active material comprising lithium cobaltate, and wherein the positive electrode active material comprises:
a first region comprising a layered rock-salt crystal structure, the first region comprising cobalt and aluminum; and
a second region comprising a rock-salt crystal structure, the second region comprising magnesium and covering at least part of the first region;
wherein a thickness of the second region is greater than or equal to 0.5 nm and less than or equal to 50 nm.

11 . A lithium-ion secondary battery comprising a positive electrode and a negative electrode,
wherein the positive electrode comprises a positive electrode active material comprising lithium cobaltate, and wherein the positive electrode active material comprises:
a first region comprising a layered rock-salt crystal structure, the first region comprising cobalt and aluminum; and
a second region comprising a rock-salt crystal structure, the second region comprising magnesium and covering at least part of the first region;
wherein a crystal orientation of the layered rock-salt crystal structure and a crystal orientation of the rock-salt crystal structure are substantially aligned with each other, wherein an atomic ratio of the magnesium to the cobalt measured by X-ray photoelectron spectroscopy is higher than or equal to 0.25 and lower than or equal to 0.3, and wherein a thickness of the second region is greater than or equal to 0.5 nm and less than or equal to 50 nm.

12 . A lithium-ion secondary battery comprising a positive electrode and a negative electrode,
wherein the positive electrode comprises a positive electrode active material comprising lithium cobaltate, and wherein the positive electrode active material comprises:
a first region comprising a layered rock-salt crystal structure, the first region comprising cobalt and aluminum; and
a second region comprising a rock-salt crystal structure, the second region comprising magnesium and covering at least part of the first region;
wherein an atomic ratio of the magnesium to the cobalt measured by X-ray photoelectron spectroscopy is higher than or equal to 0.25 and lower than or equal to 0.3, and wherein a thickness of the second region is greater than or equal to 0.5 nm and less than or equal to 50 nm.

13 . A lithium-ion secondary battery comprising a positive electrode and a negative electrode,
wherein the positive electrode comprises a positive electrode active material comprising lithium cobaltate and one of a binder and a conductive additive, and wherein the positive electrode active material:
a first region comprising a layered rock-salt crystal structure, the first region comprising cobalt and aluminum; and
a second region comprising a rock-salt crystal structure, the second region comprising magnesium and covering at least part of the first region;
wherein the second region is located between the first region and a third region comprising the one of the binder and the conductive additive, and wherein a thickness of the second region is greater than or equal to 0.5 nm and less than or equal to 50 nm.

14 . A lithium-ion secondary battery comprising a positive electrode and a negative electrode,
wherein the positive electrode comprises a positive electrode active material comprises lithium cobaltate and one of a binder and a conductive additive, and wherein the positive electrode active material comprises:
a first region comprising a layered rock-salt crystal structure, the first region comprising cobalt and aluminum; and
a second region comprising a rock-salt crystal structure, the second region comprising magnesium and covering at least part of the first region;
wherein a crystal orientation of the layered rock-salt crystal structure and a crystal orientation of the rock-salt crystal structure are substantially aligned with each other, wherein an atomic ratio of the magnesium to the cobalt measured by X-ray photoelectron spectroscopy is higher than or equal to 0.25 and lower than or equal to 0.3, wherein the second region is located between the first region and a third region comprisi

Assignees

• Semiconductor Energy Lab

Inventors

• Ochiai Teruaki
• Kawakami Takahiro
• Mikami Mayumi
• Momma Yohei
• TSURUTA Ayae
• Takahashi Masahiro

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/525 Primary

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

• H01M4/02

  Electrodes composed of, or comprising, active material · CPC title

• H01M2300/0051

  Carbonates · CPC title

• H01M2300/0037

  Mixture of solvents · CPC title