Positive electrode for nonaqueous-electrolyte secondary battery and nonaqueous-electrolyte secondary battery using same

Patent metadata

Field	Value
Publication number	US-12482811-B2
Application number	US-202218284686-A
Country	US
Kind code	B2
Filing date	Mar 30, 2022
Priority date	Mar 31, 2021
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A disclosed positive electrode for a nonaqueous electrolyte secondary battery includes a positive-electrode current collector and a positive-electrode mixture layer on a surface of the positive-electrode current collector. The positive-electrode mixture layer includes a positive-electrode active material, a conductive material, and binders. The binders include a polyvinylpyrrolidone-based compound and a cellulose derivative.

First claim

The invention claimed is:

1 . A positive electrode for a nonaqueous electrolyte secondary battery, comprising:
a positive-electrode current collector; and a positive-electrode mixture layer on a surface of the positive-electrode current collector, wherein the positive-electrode mixture layer includes a positive-electrode active material, a conductive material, and binders, the binders include a polyvinylpyrrolidone-based compound and a cellulose derivative, the positive-electrode active material includes a lithium-containing complex oxide containing Ni, and the cellulose derivative is at least one selected from a group consisting of alkyl cellulose, hydroxyalkyl cellulose, and alkali metal salts thereof.

2 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the cellulose derivative is included in an amount of 30 to 400 parts by mass with respect to 100 parts by mass of the polyvinylpyrrolidone-based compound.

3 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 2 ,
wherein the cellulose derivative is included in an amount of 100 to 400 parts by mass with respect to 100 parts by mass of the polyvinylpyrrolidone-based compound.

4 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the binders further include nitrile-based rubber.

5 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 4 ,
wherein the nitrile-based rubber is included in an amount of 100 to 300 parts by mass with respect to 100 parts by mass of the polyvinylpyrrolidone-based compound.

6 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the binders further include polyvinylidene fluoride.

7 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the conductive material includes carbon nanotubes.

8 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the positive-electrode active material is a lithium-containing complex oxide represented by a compositional formula Li y Ni x M 1-x O 2 (where x and y satisfy 0.8≤x≤1 and 0<y≤1.2, and M includes at least one element selected from the group consisting of Co, Al, Mn, Fe, Ti, Sr, Ca, and B).

9 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 8 ,
wherein the x in the compositional formula satisfies 0.85≤x≤1.

10 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 1 ,
wherein at least one element selected from Sr and Ca is unevenly distributed near a surface of the positive-electrode active material.

11 . The positive electrode for a nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the mass of the positive-electrode mixture layer per 1 m 2 is 250 g or more.

12 . A nonaqueous electrolyte secondary battery comprising the positive electrode for a nonaqueous electrolyte secondary battery according to claim 1 .

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kuroda Kosuke
• Uka Youichirou
• Masahara Koh
• Yamamoto Rina
• Harada Tomohiro

Classifications

• H01B1/20

  Conductive material dispersed in non-conductive organic material {(organic macromolecular compounds or compositions C08)} · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title