Nonaqueous electrolyte secondary battery separator, nonaqueous electrolyte secondary battery laminated separator, nonaqueous electrolyte secondary battery member, and nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-9508975-B1
Application number	US-201615191751-A
Country	US
Kind code	B1
Filing date	Jun 24, 2016
Priority date	Nov 30, 2015
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A nonaqueous electrolyte secondary battery separator is a porous film containing a polyolefin as a main component. The nonaqueous electrolyte secondary battery separator (i) has a phase difference of 80 nm or less with respect to light having a wavelength of 590 nm in a state where the nonaqueous electrolyte secondary battery separator is impregnated with ethanol and (ii) has a porosity of 30% to 60%.

First claim

The invention claimed is:

1. A nonaqueous electrolyte secondary battery separator which is a porous film containing a polyolefin as a main component,
said nonaqueous electrolyte secondary battery separator (i) having a phase difference of 80 nm or less with respect to light having a wavelength of 590 nm in a state where said nonaqueous electrolyte secondary battery separator is impregnated with ethanol and (ii) having a porosity of 30% to 60%.

2. A nonaqueous electrolyte secondary battery laminated separator comprising:
a nonaqueous electrolyte secondary battery separator recited in claim 1 ; and
a porous layer.

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

4. A nonaqueous electrolyte secondary battery member comprising:
a cathode;
a nonaqueous electrolyte secondary battery laminated separator recited in claim 2 ; and
an anode,
the cathode, the nonaqueous electrolyte secondary battery laminated separator, and the anode being arranged in this order.

5. A nonaqueous electrolyte secondary battery comprising a nonaqueous electrolyte secondary battery separator recited in claim 1 .

6. A nonaqueous electrolyte secondary battery comprising a nonaqueous electrolyte secondary battery laminated separator recited in claim 2 .

Assignees

• Sumitomo Chemical Co

Inventors

• Matsuo Takahiro

Classifications

• H01M10/0525 Primary

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

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/491

  Porosity · CPC title

• H01M50/429

  Natural polymers · CPC title