# US 8,771,859 B2 · Separator for battery and nonaqueous electrolyte battery using same

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- Number: US 8,771,859 B2
- Document ID: US8771859B2
- Status: Granted
- Kind: B2
- Application number: 13/059,095
- Filed: 2010-03-10
- Published: 2011-06-16
- Granted: 2014-07-08
- Earliest claimed: 2009-03-13
- Assignees: Hitachi Maxell, Ltd.
- Applicants: Nobuaki Matsumoto; Hideaki Katayama; Yoshinori Sato
- Inventors: Nobuaki Matsumoto; Hideaki Katayama; Yoshinori Sato
- Web page: https://patentgrep.com/patent/US8771859B2

## CPC

- H01M 50/431: Inorganic material
- H01M 50/417: Polyolefins
- H01M 50/42: Acrylic resins
- H01M 50/423: Polyamide resins
- H01M 50/429: Natural polymers
- H01M 50/4295: {Natural cotton, cellulose or wood}
- H01M 50/44: Fibrous material
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/457: comprising three or more layers
- H01M 50/491: Porosity
- H01M 10/052: Li-accumulators
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

A separator for batteries according to the present invention includes a multilayer porous film having a resin porous film containing a thermoplastic resin as a main component and a heat resistant porous layer containing heat resistant particles as a main component, and the heat resistant porous layer has a thickness of 1 to 15 μm, and the 180° peel strength between the resin porous film and the heat resistant porous layer is 0.6 N/cm or more.

## Claims

### Claim 1

A separator for batteries, comprising a multilayer porous film including a resin porous film containing a thermoplastic resin as a main component and a heat resistant porous layer containing heat resistant particles as a main component,
wherein the heat resistant porous layer has a thickness of 1 to 15 μm,
the heat resistant porous layer contains:
0.1 to 5 parts by mass of an N-vinylacetamide polymer or a water-soluble cellulose derivative per 100 parts by mass of the heat resistant particles; and
1 part by mass or more and 30 parts by mass or less of an acrylic resin forming a crosslinked structure per 100 parts by mass of the heat resistant particles, and
the water-soluble cellulose derivative is carboxymethyl cellulose, hydroxyethyl cellulose, or hydroxypropyl cellulose.

### Claim 2 (depends on 1)

The separator for batteries according to claim 1,
wherein the thermoplastic resin is polyolefin.

### Claim 3 (depends on 1)

The separator for batteries according to claim 1,
wherein the heat resistant particles are particles of at least one selected from the group consisting of silica, alumina, boehmite, titania and barium sulfate.

### Claim 4 (depends on 1)

The separator for batteries according to claim 1,
wherein the separator has a thermal shrinkage rate of 10% or less, measured when the separator is allowed to stand in an atmosphere at 150° C. for one hour.

### Claim 5 (depends on 1)

A non-aqueous electrolyte battery comprising a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte,
wherein the separator is the separator for batteries according to claim 1.

### Claim 6 (depends on 1)

The separator for batteries according to claim 1, wherein 180° peel strength between the resin porous film and the heat resistant porous layer is 0.6 N/cm or more and 5 N/cm or less.