Cable-type secondary battery

Patent metadata

Field	Value
Publication number	US-9406939-B2
Application number	US-201414484454-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	May 7, 2013
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

The present disclosure provides a cable-type secondary battery, comprising: an inner electrode; a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; and a sheet-form outer electrode spirally wound to surround the separation layer or the inner electrode.

First claim

What is claimed is:

1. A cable-type secondary battery, comprising: an inner electrode;
a separation layer surrounding an outer surface of the inner electrode to prevent a short circuit between electrodes; and
a sheet-form outer electrode helically wound to surround the separation layer, wherein the sheet-form outer electrode is helically wound so that it does not overlap itself,
wherein the inner electrode comprises an inner current collector and an inner electrode active material layer formed on a surface of the inner current collector; and
wherein the sheet-form outer electrode comprises a sheet-form outer current collector and an outer electrode active material layer formed on a surface of the sheet-form outer current collector.

2. The cable-type secondary battery according to claim 1 , wherein the inner current collector further comprises a primer coating layer consisting of a conductive material and a binder.

3. The cable-type secondary battery according to claim 2 , wherein the conductive material comprises any one selected from the group consisting of carbon black, acetylene black, ketjen black, carbon fiber, carbon nanotube, graphene and a mixture thereof.

4. The cable-type secondary battery according to claim 2 , wherein the binder is selected from the group consisting of polyvinylidene fluoride (PVDF), polyvinylidene fluoride-co-hexafluoro propylene, polyvinylidene fluoride-co-trichloroethylene, polybutyl acrylate, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, styrene-butadiene rubber, acrylonitrile-styrene-butadiene copolymer, polyimide and a mixture thereof.

5. The cable-type secondary battery according to claim 1 , wherein the inner current collector has a plurality of recesses on at least one surface thereof.

6. The cable-type secondary battery according to claim 5 , wherein the plurality of recesses are continuously patterned or intermittently patterned.

7. The cable-type secondary battery according to claim 6 , wherein the continuously patterned recesses are formed with spacing apart from each other in a longitudinal direction.

8. The cable-type secondary battery according to claim 6 , wherein the intermittently patterned recesses are formed by a plurality of holes.

9. The cable-type secondary battery according to claim 8 , wherein the plurality of holes are a circular or polygonal shape.

10. The cable-type secondary battery according to claim 1 , wherein the inner electrode has a structure that the inner electrode active material layer is formed on a whole surface of the inner current collector, or a structure that the inner electrode active material layer is formed to surround an outer surface of the inner current collector.

11. The cable-type secondary battery according to claim 1 , wherein the inner electrode further comprises a polymer supporting layer formed on a surface of the inner electrode active material layer.

12. The cable-type secondary battery according to claim 11 , wherein the polymer supporting layer is a porous layer having a pore size of 0.01 to 10 μm and a porosity of 5 to 95%.

13. The cable-type secondary battery according to claim 11 , wherein the polymer supporting layer comprises a linear polymer with polarity, an oxide-based linear polymer or a mixture thereof.

14. The cable-type secondary battery according to claim 13 , wherein the linear polymer with polarity is selected from the group consisting of polyacrylonitrile, polyvinyl chloride, polyvinylidene fluoride (PVDF), polyvinylidene fluoride-co-hexafluoro propylene, polyvinylidene fluoride-co-trichloroethylene, polyethylene imine, polymethyl methacrylate, polybutyl acrylate, polyvinylpyrrolidone, polyvinylacetate, polyethylene-co-vinyl acetate, polyarylate, poly-p-phenylene terephthalamide and a mixture thereof.

15. The cable-type secondary battery according to claim 13 , wherein the oxide-based linear polymer is selected from the group consisting of polyethylene oxide, polypropylene oxide, polyoxymethylene, polydimethylsiloxane and a mixture thereof.

16. The cable-type secondary battery according to claim 1 , wherein the inner current collector is made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on a surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on a surface thereof; or a conductive polymer.

17. The cable-type secondary battery according to claim 16 , wherein the conductive material is selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, indium tin oxide (ITO), silver, palladium, nickel and a mixture thereof.

18. The cable-type secondary battery according to claim 16 , wherein the conductive polymer is selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride and a mixture thereof.

19. The cable-type secondary battery according to claim 1 , wherein the sheet-form outer electrode is helically wound so that each pass of its helical winding is separated by a space.

20. A cable-type secondary battery, comprising:
an inner electrode;
a separation layer surrounding an outer surface of the inner electrode to prevent a short circuit between electrodes; and
a sheet-form outer electrode helically wound to surround the separation layer, wherein the sheet-form outer electrode is helically wound so that it does not overlap itself,
wherein the sheet-form outer electrode comprises a sheet-form outer current collector and an outer electrode active material layer formed on one surface of the sheet-form outer current collector, and the outer current collector has a plurality of recesses on at least one surface thereof.

21. The cable-type secondary battery according to claim 20 , wherein the plurality of recesses are continuously patterned or intermittently patterned.

22. The cable-type secondary battery according to claim 21 , wherein the continuous patterned recesses are formed with spacing apart from each other in a longitudinal direction.

23. The cable-type secondary battery according to claim 21 , wherein the intermittently patterned recesses are formed by a plurality of holes.

24. The cable-type secondary battery according to claim 23 , wherein the plurality of holes are a circular or polygonal shape.

25. The cable-type secondary battery according to claim 20 , wherein the sheet-form outer electrode is helically wound so that each pass of its helical winding is separated by a space.

26. A cable-type secondary battery, comprising: an inner electrode;
a separation layer surrounding an outer surface of the inner electrode to prevent a short circuit between electrodes; and
a sheet-form outer electrode helically wound to surround the separation layer, wherein the sheet-form outer electrode is helically wound so that it does not overlap itself,
wherein the sheet-form outer electrode comprises a sheet-form outer current collector and an outer electrode active material layer formed on one surface of the sheet-form outer current collector, and the outer current col

Assignees

• Lg Chemical Ltd

Inventors

• Kwon Yo-Han
• Jung Hye-Ran
• Kim Eun-Kyung
• Kim Je-Young
• Kim Hyo-Mi

Classifications

• H01M50/40

  Separators; Membranes; Diaphragms; Spacing elements inside cells · CPC title

• H01M50/469

  tubular or cylindrical · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M2300/002

  Inorganic electrolyte · CPC title

• H01M10/058 Primary

  Construction or manufacture · CPC title