# US 12,191,439 B2 · Nonaqueous electrolyte secondary battery porous layer

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- Number: US 12,191,439 B2
- Document ID: US12191439B2
- Status: Granted
- Kind: B2
- Application number: 16/848,885
- Filed: 2020-04-15
- Published: 2020-10-22
- Granted: 2025-01-07
- Earliest claimed: 2019-04-16
- Assignees: Sumitomo Chemical Company, Limited
- Applicants: Sumitomo Chemical Company, Limited
- Inventors: Kensaku Horie; Yuichiro Azuma
- Web page: https://patentgrep.com/patent/US12191439B2

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/417: Polyolefins
- H01M 50/423: Polyamide resins
- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- 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
- 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

An aspect of the present invention provides a nonaqueous electrolyte secondary battery porous layer that has both favorable ion permeability and favorable peeling strength. A nonaqueous electrolyte secondary battery porous layer in accordance with an aspect of the present invention includes: a resin; and a filler, the nonaqueous electrolyte secondary battery porous layer having a thickness of less than 8.0 μm, the nonaqueous electrolyte secondary battery porous layer having a surface roughness (Ra) of not more than 0.15 μm.

## Claims

### Claim 1

A nonaqueous electrolyte secondary battery laminated separator comprising:
a polyolefin porous film; and
a nonaqueous electrolyte secondary battery porous layer formed on a least one surface of the polyolefin porous film,
the nonaqueous electrolyte secondary battery porous layer comprising:
a resin; and
a filler,
the nonaqueous electrolyte secondary battery porous layer having a thickness of less than 8.0 μm,
the nonaqueous electrolyte secondary battery porous layer having a surface which is not adjacent to the polyolefin porous film, said surface have a surface roughness (Ra) of 0.01 μm to not more than 0.098 μm.

### Claim 2 (depends on 1)

The nonaqueous electrolyte secondary battery laminated separator according to claim 1, wherein out of particles of the filler, a proportion of particles having a particle diameter of not less than 1.0 μm is not more than 5.0%, where 100% represents the total number of particles of the filler.

### Claim 3 (depends on 1)

The nonaqueous electrolyte secondary battery laminated separator according to claim 1, wherein a content ratio of the resin is not less than 40 weight % and not more than 80 weight %, where 100 weight % represents the total weight of the nonaqueous electrolyte secondary battery porous layer.

### Claim 4 (depends on 1)

The nonaqueous electrolyte secondary battery laminated separator according to claim 1, wherein a weight per unit area per one nonaqueous electrolyte secondary battery porous layer is not less than 0.5 g/m2 and not more than 2.5 g/m2.

### Claim 5 (depends on 1)

The nonaqueous electrolyte secondary battery laminated separator according to claim 1, wherein the resin is at least one selected from the group consisting of a polyolefin, a (meth) acrylate-based resin, a fluorine-containing resin, a polyamide-based resin, a polyester-based resin, and a water-soluble polymer.

### Claim 6 (depends on 5)

The nonaqueous electrolyte secondary battery laminated separator according to claim 5, wherein the polyamide-based resin is an aramid resin.

### Claim 7 (depends on 1)

A nonaqueous electrolyte secondary battery member comprising:
a positive electrode;
the nonaqueous electrolyte secondary battery laminated separator according to claim 1; and
a negative electrode,
the positive electrode, the nonaqueous electrolyte secondary battery laminated separator, and the negative electrode being arranged in this order.

### Claim 8 (depends on 1)

A nonaqueous electrolyte secondary battery comprising: the nonaqueous electrolyte secondary battery laminated separator according to claim 1.

### Claim 9 (depends on 1)

The nonaqueous electrolyte secondary battery laminated separator according to claim 1, wherein the nonaqueous electrolyte secondary battery porous layer has a surface roughness (Ra) of 0.01 μm to not more than 0.082 μm.