Cable-type secondary battery

Patent metadata

Field	Value
Publication number	US-9077048-B2
Application number	US-201414483318-A
Country	US
Kind code	B2
Filing date	Sep 11, 2014
Priority date	May 7, 2013
Publication date	Jul 7, 2015
Grant date	Jul 7, 2015

Abstract

The present disclosure provides a cable-type secondary battery, comprising: an inner electrode supporter; and a sheet-form laminate of inner electrode-separation layer-outer electrode, spirally wound on the outer surface of the inner electrode supporter, wherein the laminate of inner electrode-separation layer-outer electrode is formed by carrying out compression for the integration of an inner electrode, a separation layer for preventing a short circuit, and an outer electrode. In the cable-type secondary battery of the present disclosure, since the electrodes and the separation layer are adhered to each other and integrated, the separation layer coming into contact with the electrodes absorbs an electrolyte solution to induce the uniform supply of the electrolyte solution into the outer electrode active material layer, thereby enhancing the stability and performances of the cable-type secondary battery.

First claim

What is claimed is:

1. A cable-type secondary battery, comprising:
an inner electrode supporter; and
a sheet-form laminate of inner electrode-separation layer-outer electrode, helically wound on an outer surface of the inner electrode supporter,
wherein the laminate of inner electrode-separation layer-outer electrode is formed by carrying out compression for the integration of an inner electrode, a separation layer for preventing a short circuit, and an outer electrode, wherein a peel strength between the inner electrode and the separation layer or between the separation layer and the outer electrode is 15 to 300 N/m.

2. The cable-type secondary battery according to claim 1 , wherein the sheet-form laminate of inner electrode-separation layer-outer electrode has a strip structure extending in one direction.

3. The cable-type secondary battery according to claim 1 , wherein the sheet-form laminate of inner electrode-separation layer-outer electrode is helically wound so that it does not overlap itself.

4. The cable-type secondary battery according to claim 3 , wherein the sheet-form laminate of inner electrode-separation layer-outer electrode is helically wound so that each pass of its helical winding is separated by a space.

5. The cable-type secondary battery according to claim 1 , wherein the sheet-form laminate of inner electrode-separation layer-outer electrode is helically wound so that it overlaps itself.

6. The cable-type secondary battery according to claim 5 , wherein the sheet-form laminate of inner electrode-separation layer-outer electrode is helically wound so that a width of its overlapped part is less than or equal to 90% of a width of the sheet-form laminate of inner electrode-separation layer-outer electrode.

7. The cable-type secondary battery according to claim 1 ,
wherein the inner electrode supporter has an open structure or a hollow structure whose central part is empty.

8. The cable-type secondary battery according to claim 7 , wherein the inner electrode supporter is in the form of a hollow fiber, a wound wire, a wound sheet or a mesh.

9. The cable-type secondary battery according to claim 8 , wherein the hollow fiber is obtained from at least one selected from the group consisting of polyethylene, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, polyimide, polyethylene terephthalate, polyamide imide, polyester imide, polyether sulfone, polysulfone and a mixture thereof.

10. The cable-type secondary battery according to claim 7 , wherein the inner electrode supporter comprises two or more wire-form inner electrode supporters being helically crossed with each other.

11. The cable-type secondary battery according to claim 7 , wherein the inner electrode supporter is provided with a core of inner current collector, a core for supplying lithium ions, which comprises an electrolyte, or a filling core therein.

12. The cable-type secondary battery according to claim 11 , wherein the core of inner current collector is made of carbon nanotube, stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on the surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on the surface thereof; or a conductive polymer.

13. The cable-type secondary battery according to claim 11 , wherein the core for supplying lithium ions comprises a gel polymer electrolyte and a support.

14. The cable-type secondary battery according to claim 11 , wherein the core for supplying lithium ions comprises a liquid electrolyte and a porous carrier.

15. The cable-type secondary battery according to claim 11 , wherein the electrolyte is selected from a non-aqueous electrolyte solution using ethylene carbonate (EC), propylene carbonate (PC), butylenes carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), methyl formate (MF), γ-butyrolactone (γ-BL), sulfolane, methyl acetate (MA) or methyl propionate (MP);
a gel polymer electrolyte using PEG, PVdF, PVdF-HFP, PMMA, PAN, or PVAc; and
a solid electrolyte using PEG, polypropylene oxide (PPG), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).

16. The cable-type secondary battery according to claim 11 , wherein the electrolyte further comprises a lithium salt.

17. The cable-type secondary battery according to claim 16 , wherein the lithium salt is selected from LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and a mixture thereof.

18. The cable-type secondary battery according to claim 11 , the filling core is made of polymer resins, rubber and inorganics in the form of a wire, a fiber, a powder, a mesh or a foam.

19. The cable-type secondary battery according to claim 1 , wherein the separation layer is an electrolyte layer or a separator.

20. The cable-type secondary battery according to claim 19 , wherein the electrolyte layer comprises an electrolyte selected from a gel polymer electrolyte using PEO, PVdF, PMMA, PVdF-HFP, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).

21. The cable-type secondary battery according to claim 19 , wherein the electrolyte layer further comprises a lithium salt.

22. The cable-type secondary battery according to claim 19 , wherein the separator is a porous polymer substrate made of a polyolefin-based polymer selected from the group consisting of ethylene homopolymers, propylene homopolymers, ethylene-butene copolymers, ethylene-hexene copolymers, and ethylene-methacrylate copolymers; a porous substrate made of a polymer selected from the group consisting of polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyether ether ketones, polyether sulfones, polyphenylene oxides, polyphenylene sulfides and polyethylene naphthalates; a porous polymer substrate made of a mixture of inorganic particles and a binder polymer; or a separator having a porous coating layer formed on at least one surface of the porous polymer substrate and comprising inorganic particles and a binder polymer.

23. The cable-type secondary battery according to claim 22 , wherein the porous polymer substrate is a porous polymer film substrate or a porous non-woven fabric substrate.

24. The cable-type secondary battery according to claim 1 , which further comprises a protection coating surrounding the outer surface of the outer electrode.

25. The cable-type secondary battery according to claim 24 , wherein the protection coating is made of a polymer resin.

26. The cable-type secondary battery according to claim 25 , wherein the polymer resin comprises any one selected from the group consisting of PET, PVC, HDPE, an epoxy resin and a mixture thereof.

27. The cable-type secondary battery according to claim 25 , wherein the protection coating further comprises a moisture-blocking layer.

28. The cable-type secondary battery according to claim 27 , wherein the moisture-blocking layer is made of aluminum or a liquid-crystalline polymer.

29. A cable-type s

Assignees

• Lg Chemical Ltd

Inventors

• Kwon Yo-Han
• Oh Byung-Hun
• Jung Hye-Ran
• Kim Je-Young

Classifications

• H01M50/469

  tubular or cylindrical · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M2300/0017

  Non-aqueous electrolytes · CPC title

• H01M4/74

  Meshes or woven material; Expanded metal · CPC title

• H01M10/058 Primary

  Construction or manufacture · CPC title