Positive electrode active material, positive electrode, secondary battery, and method for manufacturing positive electrode

Patent metadata

Field	Value
Publication number	US-12548762-B2
Application number	US-201917252530-A
Country	US
Kind code	B2
Filing date	Jun 11, 2019
Priority date	Jun 22, 2018
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A positive electrode active material, which has a high capacity and excellent charge and discharge cycle performance, for a lithium-ion secondary battery is provided. Alternatively, a positive electrode active material that inhibits a decrease in capacity in charge and discharge cycles when used in a lithium-ion secondary battery is provided. Alternatively, a high-capacity secondary battery is provided. Alternatively, a highly safe or reliable secondary battery is provided. The positive electrode active material contains a first substance including a first crack and a second substance positioned inside the first crack. The first substance contains one or more of cobalt, manganese, and nickel, lithium, oxygen, magnesium, and fluorine. The second substance contains phosphorus and oxygen.

First claim

The invention claimed is:

1 . A method for manufacturing a positive electrode, comprising:
a first step of mixing a first material comprising one or more of cobalt, manganese, and nickel, a second material comprising magnesium, and a third material comprising fluorine to form a first mixture; a second step of heating the first mixture; a third step of mixing the first mixture heated in the second step and a fourth material comprising phosphorus to form a second mixture; and a fourth step of heating the second mixture, wherein the first material has a layered rock-salt crystal structure, and
wherein the fourth material comprises a phosphate compound.

2 . The method for manufacturing a positive electrode, according to claim 1 ,
wherein the number of phosphorus atoms contained in the fourth material is Mp, wherein a sum of the numbers of cobalt atoms, manganese atoms, and nickel atoms contained in the first material is Mm, and wherein Mp is greater than or equal to 0.01 times and less than or equal to 0.12 times Mm.

3 . A method for manufacturing a positive electrode, comprising:
a first step of mixing a first material comprising one or more of cobalt, manganese, and nickel, a second material comprising magnesium, and a third material comprising fluorine to form a first mixture; a second step of heating the first mixture; a third step of mixing the first mixture heated in the second step and a fourth material comprising phosphorus to form a second mixture; and a fourth step of heating the second mixture, wherein the first material has a layered rock-salt crystal structure, wherein the fourth material comprises a phosphate compound, and wherein the heating in the fourth step is performed at a temperature higher than or equal to 550°C. and lower than or equal to 950°C.

Assignees

• Semiconductor Energy Lab

Inventors

• Machikawa Kazuhito
• Momma Yohei
• Ochiai Teruaki
• Mikami Mayumi

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525

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

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/525

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