Nonaqueous electrolyte secondary battery insulating porous layer

Patent metadata

Field	Value
Publication number	US-10516148-B2
Application number	US-201715593422-A
Country	US
Kind code	B2
Filing date	May 12, 2017
Priority date	Apr 14, 2017
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

The present invention improves productivity of production of a nonaqueous electrolyte secondary battery. A nonaqueous electrolyte secondary battery insulating porous layer in accordance with an embodiment of the present invention is a constituent member of a nonaqueous electrolyte secondary battery laminated separator, includes a thermoplastic resin, has a porosity of 25% to 80%, and has a peeling strength of above 0 N/m to 2.0 N/m when press-bonded to a nonaqueous electrolyte secondary battery electrode at 25° C. through two one-minute 30 kN applications, the nonaqueous electrolyte secondary battery electrode containing an electrode active material, an electrically conductive agent, and a binding agent in a mass fraction of 92:2.7:5.3.

First claim

The invention claimed is:

1. A nonaqueous electrolyte secondary battery insulating porous layer for covering an entire area of at least one surface of a porous base material included in a nonaqueous electrolyte secondary battery laminated separator,
wherein:
the nonaqueous electrolyte secondary battery insulating porous layer includes a thermoplastic resin, has a porosity of 25% to 80%, and has a peeling strength of above 0 N/m to 2.0 N/m when press-bonded to a nonaqueous electrolyte secondary battery electrode at 25° C. through two one-minute 30 kN applications, the nonaqueous electrolyte secondary battery electrode containing an electrode active material, an electrically conductive agent, and a binding agent in a mass fraction of 92:2.7:5.3; and
the thermoplastic resin is at least one selected from the group consisting of wholly aromatic polyamide, wholly aromatic polyimide, wholly aromatic polyester, wholly aromatic polycarbonate, wholly aromatic polysulfone, and wholly aromatic polyether;
wherein the insulating porous layer has a thickness of 0.5 μm to 15 μm on each surface of the porous base material covered by the insulating porous layer.

2. The nonaqueous electrolyte secondary battery insulating porous layer as set forth in claim 1 , wherein the peeling strength is 0.5 NM to 2.0 N/m.

3. A nonaqueous electrolyte secondary battery laminated separator comprising:
a nonaqueous electrolyte secondary battery insulating porous layer recited in claim 1 ; and
a polyolefin porous film.

4. A nonaqueous electrolyte secondary battery member comprising:
a cathode;
a nonaqueous electrolyte secondary battery insulating porous layer recited in claim 1 ; and
an anode,
the cathode, the nonaqueous electrolyte secondary battery insulating porous layer, and the anode being arranged in this order.

5. A nonaqueous electrolyte secondary battery comprising:
a nonaqueous electrolyte secondary battery insulating porous layer recited in claim 1 .

6. A nonaqueous electrolyte secondary battery member comprising:
a cathode;
a nonaqueous electrolyte secondary battery laminated separator recited in claim 3 ; and
an anode,
the cathode, the nonaqueous electrolyte secondary battery laminated separator, and the anode being arranged in this order.

7. A nonaqueous electrolyte secondary battery comprising:
a nonaqueous electrolyte secondary battery laminated separator recited in claim 3 .

8. The nonaqueous electrolyte secondary battery insulating porous layer as set forth in claim 1 , wherein the thermoplastic resin is wholly aromatic polyamide.

Assignees

• Sumitomo Chemical Co

Inventors

• Ogata Toshihiko
• Suzuki Junji
• Hashiwaki Hiroki

Classifications

• H01M2/1686 Primary

  Electricity · mapped topic

• H01M2/1653

  Electricity · mapped topic

• H01M50/491

  Porosity · CPC title

• H01M50/489 Primary

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title