Binder composition for electrochemical device, slurry composition for electrochemical device functional layer, slurry composition for electrochemical device adhesive layer, and composite membrane

Patent metadata

Field	Value
Publication number	US-2020220174-A1
Application number	US-201816622535-A
Country	US
Kind code	A1
Filing date	Jun 29, 2018
Priority date	Jun 29, 2017
Publication date	Jul 9, 2020
Grant date	—

Abstract

Provided is a binder composition for an electrochemical device that has excellent binding capacity and is capable of forming a functional layer that can improve rate characteristics and cycle characteristics of an electrochemical device (for example, a secondary battery). The binder composition for an electrochemical device contains a binder and an organonitrogen compound. The binder is a polymer including at least one functional group selected from the group consisting of a carboxyl group, a hydroxyl group, a cyano group, an amino group, an epoxy group, an oxazoline group, an isocyanate group, and a sulfo group. The organonitrogen compound includes at least one functional group selected from the group consisting of an azo group, a hydrazino group, a hydrazo group, and a nitroso group, has a 5% mass loss temperature of 140° C. or higher, and has a molecular weight of not less than 80 and not more than 1,000.

First claim

1 . A binder composition for an electrochemical device comprising a binder and an organonitrogen compound, wherein
the binder is a polymer including at least one functional group selected from the group consisting of a carboxyl group, a hydroxyl group, a cyano group, an amino group, an epoxy group, an oxazoline group, an isocyanate group, and a sulfo group, and the organonitrogen compound includes at least one functional group selected from the group consisting of an azo group, a hydrazino group, a hydrazo group, and a nitroso group, has a 5% mass loss temperature of 140° C. or higher, and has a molecular weight of not less than 80 and not more than 1,000.

2 . The binder composition for an electrochemical device according to claim 1 , wherein
the binder includes a carboxyl group, and carboxyl group content in the binder is not less than 0.01 mmol and not more than 15 mmol per 1 g of the binder.

3 . The binder composition for an electrochemical device according to claim 1 , wherein
the binder includes a cyano group, and cyano group content in the binder is not less than 1.0 mmol and not more than 40 mmol per 1 g of the binder.

4 . The binder composition for an electrochemical device according to claim 1 , wherein the organonitrogen compound further includes an amide group.

5 . The binder composition for an electrochemical device according to claim 1 , wherein content of the organonitrogen compound is not less than 0.5 mass % and not more than 85 mass % relative to the binder.

6 . A slurry composition for an electrochemical device functional layer comprising the binder composition for an electrochemical device according to claim 1 .

7 . The slurry composition for an electrochemical device functional layer according to claim 6 , further comprising an electrode active material.

8 . A slurry composition for an electrochemical device adhesive layer comprising the binder composition for an electrochemical device according to claim 1 , and not comprising an electrode active material and non-conductive particles.

9 . The slurry composition for an electrochemical device functional layer according to claim 6 , further comprising non-conductive particles.

10 . A composite membrane obtained through the slurry composition according to claim 6 being stacked on a separator substrate or introduced into a separator substrate.

11 . A composite membrane obtained through the slurry composition according to claim 9 being stacked on a separator substrate or introduced into a separator substrate.

Assignees

• Zeon Corp

Inventors

• Isshiki Yasuhiro
• Sonobe Kenya
• Asai Kazuki

Classifications

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/409

  Separators, membranes or diaphragms characterised by the material · CPC title

• C08K5/16

  Nitrogen-containing compounds {(C08K5/0091 takes precedence)} · CPC title

• C08L101/02

  characterised by the presence of specified groups {, e.g. terminal or pendant functional groups} · CPC title

• H01G11/38

  Carbon pastes or blends; Binders or additives therein · CPC title