Conductive paste and mixture paste for lithium ion battery positive electrode

Patent metadata

Field	Value
Publication number	US-2017141400-A1
Application number	US-201615341220-A
Country	US
Kind code	A1
Filing date	Nov 2, 2016
Priority date	Nov 12, 2015
Publication date	May 18, 2017
Grant date	—

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

1 . 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.

2 . The conductive paste for positive electrodes of lithium-ion batteries according to claim 1 , further containing a dispersant (D),
wherein the dispersant (D) contains a polyvinyl alcohol resin (d1), the polyvinyl alcohol resin (d1) having a repeating unit represented by the following formula:

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

3 . The conductive paste for positive electrodes of lithium-ion batteries according to claim 1 ,
wherein the conductive carbon (B) comprises acetylene black.

4 . The conductive paste for positive electrodes of lithium-ion batteries according to claim 1 ,
wherein the polycyclic aromatic hydrocarbon-containing monomer (A-1) is a naphthyl-containing polymerizable unsaturated monomer or a derivative thereof (A-2).

5 . The conductive paste for positive electrodes of lithium-ion batteries according to claim 1 ,
wherein the conductive carbon (B) further comprises graphite.

6 . The conductive paste for positive electrodes of lithium-ion batteries according to claim 1 ,
wherein the solvent (C) contains N-methyl-2-pyrrolidone.

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

8 . An electrode for positive electrodes of lithium-ion batteries obtained by using the mixture paste for positive electrodes of lithium-ion batteries of claim 7 .

9 . A lithium-ion battery having the electrode for positive electrodes of lithium-ion batteries of claim 8 .

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

• C09D133/14

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M10/0525

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

• H01B1/24

  the conductive material comprising carbon-silicon compounds, carbon or silicon · CPC title

• H01M4/622

  being polymers · CPC title