# US 8,771,880 B2 · Binder for separator of non-aqueous electrolyte battery comprising 2-cyanoethyl group-containing polymer and separator and battery using the same

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- Number: US 8,771,880 B2
- Document ID: US8771880B2
- Status: Granted
- Kind: B2
- Application number: 13/430,818
- Filed: 2012-03-27
- Published: 2012-10-11
- Granted: 2014-07-08
- Earliest claimed: 2011-04-05
- Assignees: Shin-Etsu Chemical Co., Ltd.; Matsugaki Chemical Industries Co., Ltd.
- Applicants: Ikuo Fukui; Kazuhisa Hayakawa; Soji Tanioka; Masahiro Ohgata; Masaaki Kajitani
- Inventors: Ikuo Fukui; Kazuhisa Hayakawa; Soji Tanioka; Masahiro Ohgata; Masaaki Kajitani
- Web page: https://patentgrep.com/patent/US8771880B2

## CPC

- H01M 10/058: Construction or manufacture
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/417: Polyolefins
- H01M 50/42: Acrylic resins
- H01M 50/423: Polyamide resins
- H01M 50/426: Fluorocarbon polymers
- H01M 50/429: Natural polymers
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/491: Porosity
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Object of the invention is to provide a binder for a separator which can be comprised by a non-aqueous electrolyte battery with improved battery properties and heat resistance; the separator comprising the binder; and the non-aqueous electrolyte battery comprising the separator. More specifically, provided is a binder for a separator of a non-aqueous electrolyte battery, the separator comprising a 2-cyanoethyl group-containing polymer having bis-cyanoethyl ether content of 0.5% by weight or less as an impurity.

## Claims

### Claim 1

A separator for a non-aqueous electrolyte battery, the separator comprising:
a porous substrate and a heat-resistant porous layer comprising an inorganic filler and a binder comprising a 2-cyanoethyl group-containing polymer having bis-cyanoethyl ether content of 0.2% to 0.5% by weight or-less as an impurity,
wherein content of metal salts present in the 2-cyanoethyl group-containing polymer is 50 ppm or less in terms of metal.

### Claim 2 (depends on 1)

The separator according to claim 1, wherein the 2-cyanoethyl group-containing polymer is cyanoethyl polyvinyl alcohol.

### Claim 3 (depends on 1)

The separator according to claim 1, wherein the porous substrate is a substrate of polyolefin, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, polyether sulfone, or any combination thereof.

### Claim 4 (depends on 3)

The separator according to claim 3, wherein the inorganic filler is selected from a group consisting of inorganic oxides, inorganic nitrides, poorly soluble ionic crystals, covalent crystals, clay, a material derived from a mineral, lithium titanium phosphate represented by LixTiy(PO4)3 wherein x and y are numbers satisfying 0≦x≦2 and 0≦y≦3, respectively, and any combination thereof.

### Claim 5 (depends on 1)

A non-aqueous electrolyte battery comprising a positive electrode, a negative electrode, the separator of claim 1 and an electrolyte solution.

### Claim 6 (depends on 5)

The non-aqueous electrolyte battery according to claim 5, wherein the electrolyte solution comprises cyclic carbonate ester selected from the group consisting of ethylene carbonate and propylene carbonate; chain carbonate ester selected from the group consisting of dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; and a lithium salt.

### Claim 7 (depends on 4)

A non-aqueous electrolyte battery comprising a positive electrode, a negative electrode, the separator of claim 4 and an electrolyte solution.

### Claim 8 (depends on 7)

The non-aqueous electrolyte battery according to claim 7, wherein the electrolyte solution comprises cyclic carbonate ester selected from the group consisting of ethylene carbonate and propylene carbonate; chain carbonate ester selected from the group consisting of dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate; and a lithium salt.