# US 10,319,973 B2 · Laminated body

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- Number: US 10,319,973 B2
- Document ID: US10319973B2
- Status: Granted
- Kind: B2
- Application number: 15/627,804
- Filed: 2017-06-20
- Published: 2017-12-21
- Granted: 2019-06-11
- Earliest claimed: 2016-06-21
- Assignees: Sumitomo Chemical Company, Limited
- Applicants: Sumitomo Chemical Company, Limited
- Inventors: Toshihiko Ogata; Junji Suzuki; Chikara Murakami
- Web page: https://patentgrep.com/patent/US10319973B2

## CPC

- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF}
- H01M 50/417: Polyolefins
- H01M 50/426: Fluorocarbon polymers
- H01M 50/443: Particulate material
- H01M 50/449: having a layered structure
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/457: comprising three or more layers
- H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- Y02E 60/10: Energy storage using batteries
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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

To afford a nonaqueous electrolyte secondary battery separator that is not easily curled, a laminated body of the present invention includes: a porous base material containing a polyolefin-based resin as a main component; and a porous layer on at least one surface of the porous base material, the porous layer containing a polyvinylidene fluoride-based resin, the porous film having a lightness (L*) of not less than 83 and not more than 95 and a white index (WI) of not less than 85 and not more than 98, the polyvinylidene fluoride-based resin containing crystal form α in an amount of not less than 34 mol % with respect to 100 mol % of a total amount of the crystal form α and crystal form β contained in the polyvinylidene fluoride-based resin.

## Claims

### Claim 1

A laminated body, comprising:
a porous base material containing a polyolefin-based resin as a main component; and
a porous layer on at least one surface of the porous base material, the porous layer containing a polyvinylidene fluoride-based resin,
the porous base material having (i) a lightness (L*) in an L*a*b* color system of not less than 83 and not more than 95, the L*a*b* color system being defined in JIS Z 8781-4, and (ii) a white index (WI) of not less than 85 and not more than 98, the white index (WI) being defined in American Standard Test Methods E313,
the polyvinylidene fluoride-based resin containing crystal form α in an amount of not less than 34 mol % with respect to 100 mol % of a total amount of the crystal form α and crystal form β contained in the polyvinylidene fluoride-based resin,
where the amount of the crystal form α is calculated from an absorption intensity at around 765 cm−1 in an IR spectrum of the porous layer, and an amount of the crystal form β is calculated from an absorption intensity at around 840 cm−1 in the IR spectrum of the porous layer,
wherein the amount F(α) (%) of the crystal form α contained in the polyvinylidene fluoride-based resin with respect to 100 mol % of the total amount of the crystal form α and the crystal form β contained in the polyvinylidene fluoride-based resin is calculated according to the following formula (4a):
F(α)(%)=[1-{absorption intensity at 840 cm−1/(absorption intensity at 765 cm−1×correction factor (1.681)+absorption intensity at 840 cm−1)}]×100 (4a).

### Claim 2 (depends on 1)

The laminated body according to claim 1, wherein the polyvinylidene fluoride-based resin contains (i) a homopolymer of vinylidene fluoride and/or (ii) a copolymer of vinylidene fluoride and at least one monomer selected from the group consisting of hexafluoropropylene, tetrafluoroethylene, trifluoroethylene, trichloroethylene, and vinyl fluoride.

### Claim 3 (depends on 1)

The laminated body according to claim 1, wherein the polyvinylidene fluoride-based resin has a weight-average molecular weight of not less than 200,000 and not more than 3,000,000.

### Claim 4 (depends on 1)

The laminated body according to claim 1, wherein the porous layer contains a filler.

### Claim 5 (depends on 4)

The laminated body according to claim 4, wherein the filler has a volume-average particle size of not less than 0.01 μm and not more than 10 μm.

### Claim 6 (depends on 1)

A nonaqueous electrolyte secondary battery member, comprising: a cathode; a laminated body according to claim 1; and an anode, the cathode, the laminated body, and the anode being arranged in this order.

### Claim 7 (depends on 1)

A nonaqueous electrolyte secondary battery, comprising as a separator a laminated body according to claim 1.

### Claim 8 (depends on 4)

The laminated body according to claim 4, wherein the filler includes polyaramid.