Coating solution

Patent metadata

Field	Value
Publication number	US-2024405224-A1
Application number	US-202418624436-A
Country	US
Kind code	A1
Filing date	Apr 2, 2024
Priority date	Jun 2, 2023
Publication date	Dec 5, 2024
Grant date	—

Abstract

A coating solution used for forming a coating film on a surface of a positive electrode active material, wherein the coating solution includes a solvent and a solute, the solvent includes water, the solute includes M element, the M element includes at least one selected from the group consisting of phosphorus and boron, a content of the M element in the coating solution is 0.05% by mass or more and 3.0% by mass or less, a content of lithium in the coating solution is less than 0.1% by mass, an absorbance in a wavelength 660 nm of the coating solution is 0.1 or less, and a surface energy of the coating solution is 50 mN/m or less.

First claim

What is claimed is:

1 . A coating solution to be used to form a coating film on a surface of a positive electrode active material, wherein:
the coating solution comprises a solvent and a solute; the solvent contains water; the solute contains an M element; the M element contains at least one kind selected from the group consisting of phosphorus and boron; a content of the M element in the coating solution is 0.05% by mass or more and 3.0% by mass or less; a content of lithium in the coating solution is less than 0.1% by mass; absorbance of the coating solution at a wavelength of 660 nm is 0.1 or less; and surface energy of the coating solution is 50 mN/m or less.

2 . The coating solution according to claim 1 , wherein:
the coating solution may further contain a surfactant; and a content of the surfactant in the coating solution may be 0.01% by mass or more and 1.5% by mass or less.

3 . The coating solution according to claim 1 , wherein the surface energy of the coating solution may be 15 mN/m or more and 30 mN/m or less.

4 . A coating solution to be used to form a coating film on a surface of a positive electrode active material, wherein:
the coating solution comprises a solvent, a solute, and a surfactant; the solvent contains water; the solute contains an M element; the M element contains at least one kind selected from the group consisting of phosphorus and boron; a content of the M element in the coating solution is 1.5% by mass or more and 2.6% by mass or less; a content of lithium in the coating solution is less than 0.1% by mass; absorbance of the coating solution at a wavelength of 660 nm is 0.1 or less; surface energy of the coating solution is 15 mN/m or more and 30 mN/m or less; and a content of the surfactant in the coating solution is 0.1% by mass or more and 1.0% by mass or less.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kubota Masaru

Classifications

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · 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

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/0525

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