NONAQUEOUS ELECTROLYTE SECONDARY BATTERY SEPARATOR, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY LAMINATED SEPARATOR, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY MEMBER, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

• US 20170155120A1
• Filed: 11/29/2016
• Published: 06/01/2017
• Est. Priority Date: 11/30/2015
• Status: Abandoned Application

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: MURAKAMI, Chikara, YOSHIMARU, Chikae
• Application Number:
  US15/362,882
• Publication Number:
  US 20170155120A1
• Time in Patent Office: Days
• 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 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/443 Particulate material
• CPC Class Codes: H01M 50/449 having a layered structure
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: H01M 50/489 Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• CPC Class Codes: H01M 50/491 Porosity
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Provided is a nonaqueous electrolyte secondary battery separator including a porous film containing polyolefin as a main component, the nonaqueous electrolyte secondary battery separator having a time until temperature rise cessation with respect to an amount of resin per unit area of 2.9 sec·m²/g to 5.7 sec·m²/g, the time being obtained in a case where the nonaqueous electrolyte secondary battery separator is impregnated with N-methyl pyrrolidine containing 3 wt % water and is subsequently irradiated, at an output of 1,800 W, with a microwave having a frequency of 2,455 MHz, the nonaqueous electrolyte secondary battery separator having an excellent initial rate characteristic and being capable of preventing a deterioration in rate characteristic which deterioration is caused by repeated charge and discharge.

Claims

1. A nonaqueous electrolyte secondary battery separator comprising a porous film containing not less than 50% by volume of polyolefin,

the nonaqueous electrolyte secondary battery separator having a time until temperature rise cessation with respect to an amount of resin per unit area of 2.9 sec·

m²/g to 5.7 sec·

m²/g, the time being obtained in a case where the nonaqueous electrolyte secondary battery separator is impregnated with N-methylpyrrolidone containing 3 wt % water and is subsequently irradiated, at an output of 1,800 W, with a microwave having a frequency of 2,455 MHz.

2. The nonaqueous electrolyte secondary battery separator as set forth in claim 1, wherein the time until temperature rise cessation with respect to an amount of resin per unit area ranges from 2.9 sec·

m²/g to 5.3 sec·

m²/g.

3. A nonaqueous electrolyte secondary battery laminated separator comprising:

a nonaqueous electrolyte secondary battery separator recited in claim 1; and

a porous layer.

4. A nonaqueous electrolyte secondary battery laminated separator comprising:

a nonaqueous electrolyte secondary battery separator recited in claim 2; and

a porous layer.

5. 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 provided in this order.

6. A nonaqueous electrolyte secondary battery member comprising:

a cathode;

a nonaqueous electrolyte secondary battery separator recited in claim 2; and

an anode,

the cathode, the nonaqueous electrolyte secondary battery separator, and the anode being provided in this order.

7. 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 provided in this order.

8. A nonaqueous electrolyte secondary battery member comprising:

a cathode;

a nonaqueous electrolyte secondary battery laminated separator recited in claim 4; and

an anode,

the cathode, the nonaqueous electrolyte secondary battery laminated separator, and the anode being provided in this order.

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

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

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

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