BATTERY SEPARATOR AND METHOD FOR MANUFACTURING THE SAME

• US 20120164513A1
• Filed: 09/18/2011
• Published: 06/28/2012
• Est. Priority Date: 12/22/2010
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Peng, Yu Min, Pan, Jing-Pin, Wang, Tsung-Hsiung, Yang, Chang-Rung
• Application Number:
  US13/235,407
• Publication Number:
  US 20120164513A1
• Time in Patent Office: Days
• US Class Current: 429/144
• CPC Class Codes: C08G 83/005 Hyperbranched macromolecules
• CPC Class Codes: D06M 15/3562 containing nitrogen
• CPC Class Codes: D06M 15/59 Polyamides; Polyimides
• CPC Class Codes: D06M 15/595 Derivatives obtained by substitution of a hydrogen atom of the carboxamide radical
• CPC Class Codes: D06M 15/61 Polyamines polyimines
• 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 50/489 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: H01M 50/494 Tensile strength
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The present discloser provides a battery separator, including: a porous hyper-branched polymer which undergoes a closed-pore mechanism at a field effect condition, wherein the field effect condition includes at least one of a temperature being above 150° C., a voltage being 20V, or a current being 6 A; and a porous structure material. The invention also provides a method for manufacturing the battery separator and a secondary battery having the battery separator.

Claims

1. A battery separator, comprising:

a porous hyper-branched polymer which undergoes a closed-pore mechanism at a field effect condition, wherein the field effect condition includes at least one of a temperature being above 150°

C., a voltage being 20V, or a current being 6 A; and

a porous structure material.

2. The battery separator as claimed in claim 1, wherein the porous structure material and the porous hyper-branched polymer are formed as a single film.

3. The battery separator as claimed in claim 1, wherein the porous hyper-branched polymer is a film coated onto the porous structure material.

4. The battery separator as claimed in claim 1, wherein the porous structure material comprises polyethylene, polypropylene, poly(tetrafluoroethylene), polyamide, poly(viny chloride), polyvinylidine fluride, polyaniline, polyimide, nonwoven, polyethylene terephthalate, polystyrene, or combinations thereof.

5. The battery separator as claimed in claim 1, wherein the porous hyper-branched polymer is formed by a reaction of a nitrogen-containing polymer and a diketones-containing compound, wherein the nitrogen-containing polymer comprises amine, amide, imide, maleimides, imine, or combinations thereof, and wherein the diketones-containing compound comprises barbituric acid (BTA).

6. The battery separator as claimed in claim 1, further comprising a binder.

7. The battery separator as claimed in claim 6, wherein the binder comprises polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), polyamide, melamine resin, or combinations thereof.

8. The battery separator as claimed in claim 1, wherein the battery separator has a pore size between about 0.2 nm and 500 nm, and a porosity between about 10% and 80%.

9. The battery separator as claimed in claim 1, wherein pores of the porous hyper-branched polymer start to shrink at a temperature above about 70°

C.

22. A secondary battery, comprising:

a cathode and an anode;

an electrolyte between the cathode and the anode; and

a battery separator as claim in claim 1 disposed between the cathode and the anode to separate the cathode and the anode.

10. A method for manufacturing a battery separator, comprising:

providing a porous structure film; and

coating a porous hyper-branched polymer onto the porous structure film to form a battery separator, wherein the battery separator comprises the porous hyper-branched polymer undergoing a closed-pore mechanism at a field effect condition, wherein the field effect condition includes at least one of a temperature being above 150°

C., a voltage being 20V, or a current being 6 A.

11. The method for manufacturing a battery separator as claimed in claim 10, wherein the porous structure film comprises polyethylene, polypropylene, poly(tetrafluoroethylene), polyamide, poly(viny chloride), polyvinylidine fluride, polyaniline, polyimide, nonwoven, polyethylene terephthalate, polystyrene, or combinations thereof.

12. The method for manufacturing a battery separator as claimed in claim 10, wherein the porous hyper-branched polymer is formed by a reaction of a nitrogen-containing polymer and a diketones-containing compound, wherein the nitrogen-containing polymer comprises amine, amide, imide, maleimides, imine, or combinations thereof, and wherein the diketones-containing compound comprises barbituric acid (BTA).

13. The method for manufacturing a battery separator as claimed in claim 10, further comprising before coating the porous hyper-branched polymer onto the porous structure film, surface modifying the porous structure film by alkalizing or plasma.

14. The method for manufacturing a battery separator as claimed in claim 10, further comprising before coating the porous hyper-branched polymer onto the porous structure film, surface modifying the porous hyper-branched polymer film by alkalizing or plasma.

15. The method for manufacturing a battery separator as claimed in claim 10, further comprising mixing the hyper-branched polymer with a binder before coating the porous hyper-branched polymer onto the porous structure film.

16. A method for manufacturing a battery separator, comprising:

mixing a porous structure material and a porous hyper-branched polymer to form a mixture; and

subjecting the mixture to a dry or wet process to form a battery separator, wherein the battery separator comprises the porous hyper-branched polymer undergoing a closed-pore mechanism at a field effect condition, wherein the field effect condition includes at least one of a temperature being above 150°

C., a voltage being 20V, or a current being 6 A.

17. The method for manufacturing a battery separator as claimed in claim 16, wherein the porous structure material comprises polyethylene, polypropylene, poly(tetrafluoroethylene), polyamide, poly(viny chloride), polyvinylidine fluride, polyaniline, polyimide, nonwoven, polyethylene terephthalate, polystyrene, or combinations thereof.

18. The method for manufacturing a battery separator as claimed in claim 16, wherein the porous hyper-branched polymer is formed by a reaction of a nitrogen-containing polymer and a diketones-containing compound, wherein the nitrogen-containing polymer comprises amine, amide, imide, maleimides, imine, or combinations thereof, and wherein the diketones-containing compound comprises barbituric acid (BTA).

19. The method for manufacturing a battery separator as claimed in claim 16, further comprising before mixing the porous structure material and the porous hyper-branched polymer, surface modifying the porous structure material by alkalizing or a plasma.

20. The method for manufacturing a battery separator as claimed in claim 16, further comprising before mixing the porous structure material and the porous hyper-branched polymer, surface modifying the porous hyper-branched polymer by alkalizing or a plasma.

21. The method for manufacturing a battery separator as claimed in claim 16, further comprising mixing the porous hyper-branched polymer, the porous structure material, and a binder before subjecting the mixture to the dry or wet process.