Nonaqueous electrolyte secondary battery and cathode sheet therefor

Patent metadata

Field	Value
Publication number	US-9735423-B2
Application number	US-201214129639-A
Country	US
Kind code	B2
Filing date	Jun 27, 2012
Priority date	Jun 29, 2011
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

The invention provides a nonaqueous electrolyte secondary battery having a cathode and an anode arranged so as to be opposite to each other, and an electrolyte layer put therebetween;
wherein the cathode comprises:
(a) a conductive polymer and (b) at least one selected from the group consisting of a polycarboxylic acid and a metal salt thereof, and
wherein the anode comprises a material into which a base metal or ions thereof can be inserted and from which a base metal or ions thereof can be extracted. The invention further provides a cathode sheet for use in the nonaqueous electrolyte secondary battery mentioned above.

First claim

The invention claimed is:

1. A nonaqueous electrolyte secondary battery having a cathode and an anode arranged so as to be opposite to each other, and an electrolyte layer put therebetween;
wherein the cathode comprises:
(a) a conductive polymer and
(b) at least one selected from the group consisting of a polycarboxylic acid and a metal salt of a polycarboxylic acid, and
wherein the anode comprises a material into which a base metal or ions thereof are inserted and from which a base metal or ions thereof are extracted;
wherein the conductive polymer is a polymer having as a dopant at least one protonic acid anions selected from the group consisting of inorganic acid anions, aliphatic sulfonic acid anions, aromatic sulfonic acid anions, polymer sulfonic acid anions and polyvinylsulfuric acid anions;
wherein the polymer constituting the conductive polymer is at least one selected from the group consisting of polyaniline, a polyaniline derivative, polypyrrole, a polypyrrole derivative, and polythiophene; and
wherein the polycarboxylic acid is at least one polymer selected from the group consisting of polyacrylic acid, polymethacrylic acid, polyvinylbenzoic acid, polyallylbenzoic acid, polymethallylbenzoic acid, polymaleic acid, polyfumaric acid, polyglutaminic acid, polyaspartic acid, alginic acid, carboxymethylcellulose, and a copolymer comprising repeating units of at least two of the polymers listed herein.

2. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the metal salt of polycarboxylic acid is at least one selected from the group consisting of an alkali metal salt of polycarboxylic acid and an alkaline earth metal salt of polycarboxylic acid.

3. The nonaqueous electrolyte secondary battery according to claim 1 , which is a lithium secondary battery.

4. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the polymer constituting the conductive polymer is polyaniline or a polyaniline derivative.

5. A cathode sheet for use in a nonaqueous electrolyte secondary battery, which comprises a composite material comprising a collector and a layer of a cathode active material provided thereon,
wherein the layer of a cathode active material comprises:
(a) a conductive polymer and
(b) at least one selected from the group consisting of a polycarboxylic acid and a metal salt polycarboxylic acid;
wherein the conductive polymer is a polymer having as a dopant at least one protonic acid anions selected from the group consisting of inorganic acid anions, aliphatic sulfonic acid anions, aromatic sulfonic acid anions, polymer sulfonic acid anions and polyvinylsulfuric acid anions;
wherein the polymer constituting the conductive polymer is at least one selected from the group consisting of polyaniline, a polyaniline derivative, polypyrrole, a polypyrrole derivative, and polythiophene; and
wherein the polycarboxylic acid is at least one polymer selected from the group consisting of polyacrylic acid, polymethacrylic acid, polyvinylbenzoic acid, polyallylbenzoic acid, polymethallylbenzoic acid, polymaleic acid, polyfumaric acid, polyglutaminic acid, polyaspartic acid, alginic acid, carboxymethylcellulose, and a copolymer comprising repeating units of at least two of the polymers listed herein.

6. The cathode sheet for use in a nonaqueous electrolyte secondary battery according to claim 5 , wherein the salt of the polycarboxylic acid is at least one selected from the group consisting of an alkali metal salt of polycarboxylic acid and an alkaline earth metal salt of polycarboxylic acid.

7. The cathode sheet for use in a nonaqueous electrolyte secondary battery according to claim 5 or claim 6 , which is for use in a lithium secondary battery.

8. The cathode sheet for use in a nonaqueous electrolyte secondary battery according to claim 5 , wherein the polymer constituting the conductive polymer is polyaniline or a polyaniline derivative.

Assignees

• Abe Masao
• Otani Akira
• Kawashima Yujiro
• Uetani Yoshihiro
• Take Hiroyoshi
• Kishii Yutaka
• Matsuura Aimi
• Kajisa Yuki
• Ando Yohei
• Nitto Denko Corp

Inventors

• Abe Masao
• Otani Akira
• Kawashima Yujiro
• Uetani Yoshihiro
• Take Hiroyoshi
• Kishii Yutaka
• Matsuura Aimi
• Kajisa Yuki
• Ando Yohei

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/137 Primary

  Electrodes based on electro-active polymers · CPC title

• H01M4/606

  containing aromatic main chain polymers · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M2004/028

  Positive electrodes · CPC title