SEPARATOR FOR NONAQUEOUS ELECTROLYTE BATTERY, AND NONAQUEOUS ELECTROLYTE BATTERY

• US 20150180002A1
• Filed: 07/30/2013
• Published: 06/25/2015
• Est. Priority Date: 07/30/2012
• Status: Active Grant

• Current Assignee: Teijin Limited
• Original Assignee: Teijin Limited
• Inventors: Nishikawa, Satoshi, Yoshitomi, Takashi
• Granted Patent: US 9,905,825 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/54 Yield strength; Tensile strength
• CPC Class Codes: B32B 2307/718 Weight, e.g. weight per square meter
• CPC Class Codes: B32B 2457/10 Batteries
• CPC Class Codes: B32B 27/20 using fillers, pigments, thixotroping agents
• CPC Class Codes: B32B 27/304 comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/403 Manufacturing processes of separators, membranes or diaphragms
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/426 Fluorocarbon polymers
• CPC Class Codes: 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
• CPC Class Codes: H01M 50/491 Porosity
• CPC Class Codes: H01M 50/494 Tensile strength
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Provided is a separator for a nonaqueous electrolyte battery, including a porous substrate and an adhesive porous layer that is provided on one side or both sides of the porous substrate and contains an adhesive resin. The ratio of the standard deviation of the areal weight of the adhesive porous layer to the mean of the areal weight of the adhesive porous layer (g/m²) (standard deviation/mean) is 0.3 or less.

Claims

1. A separator for a nonaqueous electrolyte battery, comprising a porous substrate and an adhesive porous layer that is provided on one side or both sides of the porous substrate and contains an adhesive resin,

the ratio of the standard deviation of the areal weight of the adhesive porous layer to the mean of the areal weight of the adhesive porous layer (g/m²) (standard deviation/mean) being 0.3 or less.

2. The separator for a nonaqueous electrolyte battery according to claim 1, wherein the ratio of the standard deviation of the thickness of the porous substrate to the mean of the thickness of the porous substrate (μ

m) (standard deviation/mean) is 0.02 or less.

3. The separator for a nonaqueous electrolyte battery according to claim 1, wherein the adhesive resin is a polyvinylidene fluoride resin.

4. The separator for a nonaqueous electrolyte battery according to claim 3, wherein the polyvinylidene fluoride resin has a weight average molecular weight of 600,000 or more and 3,000,000 or less.

5. The separator for a nonaqueous electrolyte battery according to claim 1, wherein the porous substrate has an elongation of 50% or more and 200% or less in the MD direction or the TD direction.

6. The separator for a nonaqueous electrolyte battery according to claim 1, wherein the porous substrate has a puncture resistance of 200 g or more and 800 g or less.

7. The separator for a nonaqueous electrolyte battery according to claim 1, wherein the adhesive porous layer contains a filler, and the mass ratio of the filler to the adhesive resin (filler mass/adhesive resin mass) is 0.01 or more and 0.05 or less.

8. A nonaqueous electrolyte battery comprising a positive electrode, a negative electrode, and the separator for a nonaqueous electrolyte battery of claim 1 disposed between the positive electrode and the negative electrode,

an electromotive force thereof being obtained by lithium doping/dedoping.

9. The separator for a nonaqueous electrolyte battery according to claim 2, wherein the adhesive resin is a polyvinylidene fluoride resin.

10. The separator for a nonaqueous electrolyte battery according to claim 9, wherein the polyvinylidene fluoride resin has a weight average molecular weight of 600,000 or more and 3,000,000 or less.