Conductive paste and mixture paste for lithium ion battery positive electrode

Patent metadata

Field	Value
Publication number	US-10256472-B2
Application number	US-201615341220-A
Country	US
Kind code	B2
Filing date	Nov 2, 2016
Priority date	Nov 12, 2015
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

The present invention provides a conductive paste for positive electrodes of lithium-ion batteries and mixture paste for positive electrodes of lithium-ion batteries that have an easy-to-apply viscosity, even when a relatively small amount of a dispersant is incorporated. More specifically, the present invention provides a conductive paste for positive electrodes of lithium-ion batteries containing a dispersion resin (A), conductive carbon (B), and a solvent (C), the dispersion resin (A) being a copolymer of a monomer mixture comprising a polycyclic aromatic hydrocarbon-containing monomer (A-1) in an amount of 1 to 70 mass %, based on the total solids content.

First claim

The invention claimed is:

1. A conductive paste comprising a dispersion resin (A), conductive carbon (B), and a solvent (C),
wherein the dispersion resin (A) is a copolymer of a monomer mixture comprising a polycyclic aromatic hydrocarbon-containing monomer (A-1) in an amount of 1 to 70 mass %, based on the total solids content,
wherein the conductive paste is capable of constituting a positive electrode of a lithium-ion battery, and
wherein the polycyclic aromatic hydrocarbon-containing monomer (A-1) is naphthyl(meth)acrylate or a derivative thereof (A-1-3) of the following Formula (3):

wherein R is hydrogen or methyl, and X and Y is each independently selected from the group consisting of hydrogen, alkyl, alkoxy, alkoxycarbonyloxy, phosphoryloxy, hydroxyl, sulfonic acid, carboxyl, amino, nitro, halogen, aryloxy, alkylthio, and arylthio.

2. The conductive paste according to claim 1 , further comprising a dispersant (D),
wherein the dispersant (D) contains a polyvinyl alcohol resin (d1), and
the polyvinyl alcohol resin (d1) has a repeating unit of the following formula:

in a proportion of 30 to 100 mass % in polymer chains.

3. The conductive paste according to claim 1 ,
wherein the conductive carbon (B) comprises acetylene black.

4. The conductive paste according to claim 1 ,
wherein the conductive carbon (B) comprises graphite.

5. The conductive paste according to claim 1 ,
wherein the solvent (C) contains N-methyl-2-pyrrolidone.

6. A mixture paste for positive electrodes of lithium-ion batteries comprising the conductive paste of claim 1 , and further comprising an electrode active material.

7. A positive electrode of a lithium-ion battery comprising the mixture paste for positive electrodes of lithium-ion batteries of claim 6 .

8. A lithium-ion battery having the positive electrode of claim 7 .

Assignees

• Kansai Paint Co Ltd
• Toyota Motor Co Ltd

Inventors

• Tsukamoto Atsushi
• Akahane Junji
• Endo Koji
• Tochino Yoshinori
• Sarukawa Yuta
• Iwase Kosuke
• Abe Machiko
• Hagiwara Hideki

Classifications

• H01M4/362

  Composites · CPC title

• C09D125/02

  Homopolymers or copolymers of hydrocarbons · CPC title

• C09D7/61

  inorganic · CPC title

• H01M4/625 Primary

  Carbon or graphite · CPC title

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title