Separator for Nonaqueous Electrolyte Batteries, and Nonaqueous Electrolyte Battery

• US 20160372730A1
• Filed: 06/19/2014
• Published: 12/22/2016
• Est. Priority Date: 06/27/2013
• Status: Active Grant

• Current Assignee: Asahi Kasei E-materials Corporation (Asahi Kasei Corporation)
• Original Assignee: Asahi Kasei E-materials Corporation (Asahi Kasei Corporation)
• Inventors: Uchida, Yuki, Murata, Hiroshi, Hatayama, Hiroshi, Ishikawa, Masaki
• Granted Patent: US 10,276,849 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01G 11/52 Separators
• 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 50/417 Polyolefins
• CPC Class Codes: H01M 50/434 Ceramics
• CPC Class Codes: H01M 50/44 Fibrous material
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A separator for nonaqueous electrolyte batteries having multilayer porous membrane, having a polyolefin microporous membrane and a porous layer having an inorganic filler, disposed on at least one side of the polyolefin microporous membrane, wherein, in pores with an area of 0.01 μm² or more in a cross section of the porous layer, the pores having an angle θ formed between a major axis of each pore and an axis in parallel with an interface between the microporous membrane and the porous layer in a range of 60°≦θ≦120° occupying a proportion of 30% or more therein.

Claims

1. :

A separator for nonaqueous electrolyte batteries comprising a multilayer porous membrane, comprising;

a polyolefin microporous membrane; and

a porous layer comprising an inorganic filler, disposed on at least one side of the polyolefin microporous membrane;

wherein, in pores with an area of 0.01 μ

m² or more in a cross section of the porous layer, the pores having an angle θ

formed between a major axis of each pore and an axis in parallel with an interface between the microporous membrane and the porous layer in a range of 60°

≦

θ

≦

120°

occupying a proportion of 30% or more therein.

2. :

The separator for the nonaqueous electrolyte batteries according to claim 1,

wherein, in the pores with an area of 0.01 μ

m² or more in the cross section of the porous layer, the pores having an angle θ

formed between the major axis of each pore and the axis in parallel with the interface between the microporous membrane and the porous layer in the range of 60°

≦

θ

≦

120°

occupying a proportion of 40% or more therein.

3. :

The separator for the nonaqueous electrolyte batteries according to claim 1, wherein the porous layer has a thickness of 2 μ

m or more and 10 μ

m or less.

4. :

The separator for the nonaqueous electrolyte batteries according to claim 1, wherein the inorganic filler has an aspect ratio of 1 or more and 3 or less.

6. :

The separator for the nonaqueous electrolyte batteries according to claim 2, wherein the porous layer has a thickness of 2 μ

m or more and 10 μ

m or less.

7. :

The separator for the nonaqueous electrolyte batteries according to claim 2, wherein the inorganic filler has an aspect ratio of 1 or more and 3 or less.

8. :

The separator for the nonaqueous electrolyte batteries according to claim 3, wherein the inorganic filler has an aspect ratio of 1 or more and 3 or less.

9. :

The separator for the nonaqueous electrolyte batteries according to claim 6, wherein the inorganic filler has an aspect ratio of 1 or more and 3 or less.

5. :

A nonaqueous electrolyte battery comprising;

a separator comprising a polyolefin microporous membrane;

a positive electrode;

a negative electrode; and

an electrolyte; and

an porous layer comprising an inorganic filler, disposed on at least one side of the polyolefin microporous membrane, or a surface of the positive electrode or the negative electrode;

wherein, in pores with an area of 0.01 μ

m² or more in a cross section of the porous layer, the pores having an angle θ

formed between a major axis of each pore and an axis in parallel with an interface between the polyolefin microporous membrane, the positive electrode, or the negative electrode and the porous layer in a range of 60°

≦

θ

≦

120°

occupying a proportion of 30% or more therein.