NONAQUEOUS ELECTROLYTE SECONDARY BATTERY INSULATING POROUS LAYER

• US 20180316053A1
• Filed: 04/27/2018
• Published: 11/01/2018
• Est. Priority Date: 04/28/2017
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: KURAKANE, Kosuke, ARISE, Ichiro, MURAKAMI, Chikara
• Granted Patent: US 10,535,893 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 50/446 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

An insulating porous layer for a nonaqueous electrolyte secondary battery having excellent separator resistance is provided. The porous layer contains an inorganic filler and a resin, a central particle diameter of the inorganic filler is in a range of 0.1 μm to 11 μm, a BET specific surface area per unit area of the inorganic filler is not greater than 100 m²/g, and the value of formula (1) is in a range of 0.10 to 0.40:

[1−T/M]  (1)

In formula (1), T and M respectively represent a distance by which the insulating porous layer moves in a traverse direction or a machine direction from a starting point of measurement to a point where a critical load is obtained in a scratch test under a constant load of 0.1 N.

Claims

1. A nonaqueous electrolyte secondary battery insulating porous layer comprising an inorganic filler and a resin, wherein:

a central particle diameter of the inorganic filler is in a range of 0.1 μ

m to 11 μ

m;

a BET specific surface area per unit area of the inorganic filler is not greater than 100 m²/g; and

a value expressed by the following formula (1) is in a range of 0.10 to 0.40;

|1−

T/M| 

 

(1),

where (i) T represents a distance by which the nonaqueous electrolyte secondary battery insulating porous layer moves in a traverse direction from a starting point of measurement to a point where a critical load is obtained in a scratch test under a constant load of 0.1 N and (ii) M represents a distance by which the nonaqueous electrolyte secondary battery insulating porous layer moves in a machine direction from a starting point of measurement to a point where a critical load is obtained in the scratch test under the constant load of 0.1 N.

2. The nonaqueous electrolyte secondary battery insulating porous layer according to claim 1, wherein:

a value expressed by the following formula (2) is in a range of 0.10 to 0.40;

1−

T/M  

 

(2),

where (i) T represents a distance by which the nonaqueous electrolyte secondary battery insulating porous layer moves in the traverse direction from a starting point of measurement to a point where a critical load is obtained in a scratch test under a constant load of 0.1 N and (ii) M represents a distance by which the nonaqueous electrolyte secondary battery insulating porous layer moves in the machine direction from a starting point of measurement to a point where a critical load is obtained in the scratch test under the constant load of 0.1 N.

3. The nonaqueous electrolyte secondary battery insulating porous layer according to claim 1, wherein:

the inorganic filler contains alumina and a plate-shaped filler.

4. A nonaqueous electrolyte secondary battery laminated separator comprising:

a porous base material containing a polyolefin as a main component; and

a nonaqueous electrolyte secondary battery insulating porous layer recited in claim 1, the nonaqueous electrolyte secondary battery insulating porous layer being provided on one surface or both surfaces of the porous base material.

5. A nonaqueous electrolyte secondary battery member comprising:

a positive electrode;

a nonaqueous electrolyte secondary battery insulating porous layer recited in claim 1; and

a negative electrode,

the positive electrode, the nonaqueous electrolyte secondary battery insulating porous layer or the nonaqueous electrolyte secondary battery laminated separator, and the negative electrode being provided in this order.

6. A nonaqueous electrolyte secondary battery comprising:

a nonaqueous electrolyte secondary battery insulating porous layer recited in claim 1.

7. A nonaqueous electrolyte secondary battery member comprising:

a positive electrode;

a nonaqueous electrolyte secondary battery laminated separator recited in claim 4; and

a negative electrode,

the positive electrode, the nonaqueous electrolyte secondary battery insulating porous layer or the nonaqueous electrolyte secondary battery laminated separator, and the negative electrode being provided in this order.

8. A nonaqueous electrolyte secondary battery comprising:

a nonaqueous electrolyte secondary battery laminated separator recited in claim 4.