# US 2019/0173070 A1 · Non-Aqueous Electrolyte Secondary Battery

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- Number: US 2019/0173070 A1
- Document ID: US20190173070A1
- Status: Published application
- Kind: A1
- Application number: 16/324,049
- Filed: 2016-08-10
- Published: 2019-06-06
- Earliest claimed: 2016-08-10
- Assignees: Nissan Motor Co., Ltd.
- Applicants: Nissan Motor Co., Ltd.
- Inventors: Masato Ono; Ikuma Matsuzaki; Keisuke Matsumoto
- Web page: https://patentgrep.com/patent/US20190173070A1

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 10/0563: Liquid materials, e.g. for Li-SOCl2 cells
- H01M 50/105: Pouches or flexible bags
- H01M 50/126: comprising three or more layers
- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 50/434: Ceramics
- H01M 50/449: having a layered structure
- 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 50/491: Porosity
- H01M 10/052: Li-accumulators
- H01M 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M 50/463: Separators, membranes or diaphragms characterised by their shape
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- 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 non-aqueous electrolyte secondary battery has improved battery cycle durability and suppresses internal short-circuits. The non-aqueous electrolyte secondary battery includes a power generating element having a positive electrode, a negative electrode, and a separator including a resin film having a three-layer structure, a ratio of a rated capacity to a pore volume of a positive electrode active material layer being 2.08 Ah/cc or more, a ratio of a battery area to a rated capacity being 7 cm2/Ah or more, and a rated capacity being 50 Ah or more, in which a value R represented by Formula 1 is 62 to 110: R = Tortuosity   factor × Thickness  [ µm ] Porosity ( Formula   1 ) provided that, the average pore diameter is 0.10 to 0.18 μm, the porosity is 0.43 to 0.65, the air permeability is 140 to 305 sec/100 ml, and the thickness is 11 to 25 μm.

## Claims

### Claim 1

A non-aqueous electrolyte secondary battery comprising a power generating element including
a positive electrode obtained by forming a positive electrode active material layer containing a positive electrode active material on a surface of a positive electrode current collector,
a negative electrode obtained by forming a negative electrode active material layer containing a negative electrode active material on a surface of a negative electrode current collector, and
a separator including a resin film having a three-layer structure,
a ratio of a rated capacity to a pore volume of the positive electrode active material layer being 2.08 Ah/cc or more, a ratio of a battery area to a rated capacity being 7 cm2/Ah or more, and a rated capacity being 50 Ah or more, wherein
a value R of the separator represented by the following Formula 1 is 62 to 110:
R
=
Tortuosity


factor
×
Thickness

[
µm
]
Porosity
(
Formula


1
)
provided that, in Formula 1, a tortuosity factor is a value represented by the following Formula 2:
Tortuosity


factor
=
Air


permeability

[
sec
/
100


ml
]
×
Average


pore


diameter

[
µm
]
×
Porosity
Thickness

[
µm
]
×
25
×
5.18
×
10
-
3
(
Formula


2
)
the average pore diameter is 0.10 to 0.18 μm,
the porosity is 0.43 to 0.65,
the air permeability is 140 to 305 sec/100 ml, and
the thickness is 11 to 25 μm.

### Claim 2 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the R is 91 to 110.

### Claim 3 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the R is 81 to 90.

### Claim 4 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the R is 62 to 80.

### Claim 5 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the separator has a laminate structure of the resin film and a heat resistant insulating layer.

### Claim 6 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein a constituent of the resin film is at least one of polypropylene and polyethylene.

### Claim 7 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the non-aqueous electrolyte secondary battery is a flat stack type laminate battery obtained by sealing the power generating element in a battery outer casing body formed of a laminate film containing aluminum.