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

• US 9,508,975 B1
• Filed: 06/24/2016
• Issued: 11/29/2016
• Est. Priority Date: 11/30/2015
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Matsuo, Takahiro
• Primary Examiner(s): Lee, James
• Application Number:
  US15/191,751
• Time in Patent Office: 158 Days
• Field of Search: 429/144
• US Class Current: 1/1
• 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 10/058 Construction or manufacture
• CPC Class Codes: H01M 50/403 Manufacturing processes of separators, membranes or diaphragms
• CPC Class Codes: H01M 50/414 Synthetic resins, e.g. thermoplastics or thermosetting resins
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/429 Natural polymers
• CPC Class Codes: H01M 50/449 having a layered structure
• CPC Class Codes: H01M 50/457 comprising three or more layers
• CPC Class Codes: H01M 50/491 Porosity
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

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%.

Claims

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.