Porous layer and nonaqueous electrolyte secondary battery laminated separator

Patent metadata

Field	Value
Publication number	US-2019386278-A1
Application number	US-201916441870-A
Country	US
Kind code	A1
Filing date	Jun 14, 2019
Priority date	Jun 15, 2018
Publication date	Dec 19, 2019
Grant date	—

Abstract

A porous layer and a nonaqueous electrolyte secondary battery laminated separator are provided which are thinner than conventional layers and separators while providing superior heat resistance and battery characteristics. The porous layer contains a heat-resistant resin at a proportion of not less than 40% by weight and not more than 80% by weight and an inorganic material having an average particle diameter of not more than 0.15 μm. The porous layer has a thickness of not less than 0.5 μm and less than 8.0 μm,

First claim

1 . A porous layer comprising:
a heat-resistant resin; and an inorganic material, the porous layer containing the heat-resistant resin at a proportion of not less than 40% by weight and not more than 80% by weight, the porous layer having a thickness of not less than 0.5 μm and less than 8.0 μm, the inorganic material having an average particle diameter of not more than 0.15 μm.

2 . The porous layer as set forth in claim 1 , further comprising at least one kind of resin selected from the group consisting of polyolefins, (meth)acrylate-based resins, fluorine-containing resins, polyamide-based resins, polyester-based resins, and water-soluble polymers.

3 . The porous layer as set forth in claim 2 , wherein the polyamide-based resins are aramid resins.

4 . A nonaqueous electrolyte secondary battery laminated separator comprising:
a polyolefin porous film; and a porous layer recited in claim 1 , the polyolefin porous film and the porous layer being disposed on one another.

5 . A nonaqueous electrolyte secondary battery laminated separator comprising:
a polyolefin porous film; and a porous layer containing a heat-resistant resin and an inorganic material, the polyolefin porous film and the porous layer being disposed on one another, the porous layer containing the heat-resistant resin at a proportion of not less than 40% by weight and not more than 80% by weight, a ratio (TA/TB) of a thickness (TA) of the polyolefin porous film to a thickness (TB) of the porous layer being not less than 3 and not more than 10, the inorganic material having an average particle diameter of not more than 0.15 μm.

6 . The nonaqueous electrolyte secondary battery laminated separator as set forth in claim 5 , wherein the porous layer contains at least one kind of resin selected from the group consisting of polyolefins, (meth)acrylate-based resins, fluorine-containing resins, polyamide-based resins, polyester-based resins, and water-soluble polymers.

7 . The nonaqueous electrolyte secondary battery laminated separator as set forth in claim 6 , wherein the polyamide-based resins are aramid resins.

8 . The nonaqueous electrolyte secondary battery laminated separator as set forth in claim 4 , wherein the porous layer has a weight per unit area of not less than 0.5 g/m 2 and not more than 2.0 g/m 2 .

9 . The nonaqueous electrolyte secondary battery laminated separator as set forth in claim 5 , wherein the porous layer has a weight per unit area of not less than 0.5 g/m 2 and not more than 2.0 g/m 2 .

10 . A nonaqueous electrolyte secondary battery member comprising:
a positive electrode; a porous layer recited in claim 1 ; and a negative electrode, the positive electrode, the porous layer, and the negative electrode being disposed in this order.

11 . A nonaqueous electrolyte secondary battery comprising a porous layer recited in claim 1 .

12 . 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 disposed in this order.

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

14 . A nonaqueous electrolyte secondary battery member comprising:
a positive electrode; a nonaqueous electrolyte secondary battery laminated separator recited in claim 5 ; and a negative electrode, the positive electrode, the nonaqueous electrolyte secondary battery laminated separator, and the negative electrode being disposed in this order.

15 . A nonaqueous electrolyte secondary battery comprising a nonaqueous electrolyte secondary battery laminated separator recited in claim 5 .

Assignees

• Sumitomo Chemical Co

Inventors

• Ogata Toshihiko

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/4235 Primary

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M2/18

  Electricity · mapped topic

• H01M2/1653 Primary

  Electricity · mapped topic

• H01M2/145

  Electricity · mapped topic