Nonaqueous electrolyte secondary battery insulating porous layer

Patent metadata

Field	Value
Publication number	US-10535893-B2
Application number	US-201815965648-A
Country	US
Kind code	B2
Filing date	Apr 27, 2018
Priority date	Apr 28, 2017
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

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 m 2 /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.

First claim

The invention claimed is:

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 μm to 11 μm;
a BET specific surface area of the inorganic filler is not greater than 100 m 2 /g;
a weight per unit area of the inorganic filler and the resin is 0.5 g/m 2 to 20 g/m 2 ; and
a value expressed by the following formula (1) is in a range of 0.10 to 0.40, the value being an index indicative of the orientation of the inorganic filler:
|1−T/M|  (1),

wherein T and M are obtained in a scratch test comprising moving a test sample of the nonaqueous electrolyte secondary battery insulating porous layer a distance of 10 mm in a transverse direction of the porous layer at a speed of 5 mm/min while applying a vertical load of 0.1 N to the test sample, and then moving the test sample of the nonaqueous electrolyte secondary battery insulating porous layer a distance of 10 mm in a machine direction of the porous layer at a speed of 5 mm/min while applying a vertical load of 0.1 N, where where T represents a distance by which the porous layer moves in the transverse direction from a starting point of measurement to a point where a critical load is obtained in the scratch test until a constant load of 0.1 N and M represents a distance by which the 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,
wherein the nonaqueous electrolyte secondary battery insulating porous layer is formed by applying a coating solution containing the inorganic filler and the resin along a single direction to form the porous layer,
wherein the transverse direction is the single direction and the machine direction is a direction perpendicular to the transverse direction.

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, the value being an index indicative of the orientation of the inorganic filler:
1−T/M  (2).

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 laminated separator recited in claim 4 ; and
a negative electrode,
the positive electrode, the nonaqueous electrolyte secondary battery laminated separator, and the negative electrode being provided in this order.

6. A nonaqueous electrolyte secondary battery comprising:
a positive electrode,
an electrolyte,
the nonaqueous electrolyte secondary battery laminated separator recited in claim 4 , and
a negative electrode.

7. 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, and the negative electrode being provided in this order.

8. A nonaqueous electrolyte secondary battery comprising:
a positive electrode,
an electrolyte,
the nonaqueous electrolyte secondary battery insulating porous layer recited in claim 1 , and
a negative electrode.

9. The nonaqueous electrolyte secondary battery insulating porous layer according to claim 1 , wherein:
the resin is at least one resin selected from the group consisting of aromatic polyamides and wholly aromatic polyamides.

Assignees

• Sumitomo Chemical Co

Inventors

• Kurakane Kosuke
• Arise Ichiro
• Murakami Chikara

Classifications

• H01M10/05

  Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence) · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M10/0569

  characterised by the solvents · CPC title