Cable-type secondary battery

Patent metadata

Field	Value
Publication number	US-9413030-B2
Application number	US-201514925188-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Oct 11, 2012
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

Provided is a cable-type secondary battery extending longitudinally including a lithium ion supplying core comprising an electrolyte, an inner electrode support of a hollow structure formed to surround an outer surface of the lithium ion supplying core, an inner electrode formed on a surface of the inner electrode support and including an inner current collector and an inner electrode active material, a separation layer formed to surround an outer surface of the inner electrode to prevent a short circuit between electrodes, and an outer electrode formed to surround an outer surface of the separation layer and including an outer electrode active material layer and an outer current collector.

First claim

What is claimed is:

1. A cable-type secondary battery extending longitudinally, comprising:
a lithium ion supplying core comprising an electrolyte;
an inner electrode support of a hollow structure formed to surround an outer surface of the lithium ion supplying core;
an inner electrode formed on a surface of the inner electrode support, and including an inner current collector and an inner electrode active material layer;
a separation layer formed to surround an outer surface of the inner electrode to prevent a short circuit between electrodes; and
an outer electrode formed to surround an outer surface of the separation layer, and including an outer electrode active material layer and an outer current collector.

2. The cable-type secondary battery according to claim 1 , wherein the inner electrode support of the hollow structure is a hollow fiber.

3. The cable-type secondary battery according to claim 2 , wherein the hollow fiber is formed from at least one selected from the group consisting of polyethylene, polypropylene, polytetrafluoroethylene, polyvinylidenefluoride, polyimide, polyethyleneterephthalate, polyamide-imide, polyester-imide, polyethersulfone, and polysulfone.

4. The cable-type secondary battery according to claim 1 , wherein the inner electrode support of the hollow structure has a pore on the surface thereof to allow the electrolyte to move to an inner electrode active material and an outer electrode active material.

5. The cable-type secondary battery according to claim 4 , wherein the pore has a diameter in a range of 10 nm to 100 μm.

6. The cable-type secondary battery according to claim 1 , wherein the inner current collector is a wound wire-type current collector, a wound sheet-type current collector, or a metal coating layer.

7. The cable-type secondary battery according to claim 1 , wherein the inner electrode includes the inner electrode active material layer formed to surround the surface of the inner electrode support and the inner current collector formed to surround an outer surface of the inner electrode active material layer, or
the inner electrode includes the inner current collector formed to surround the surface of the inner electrode support and the inner electrode active material layer formed to surround an outer surface of the inner current collector.

8. The cable-type secondary battery according to claim 1 , wherein the outer electrode includes the outer electrode active material layer formed to surround the outer surface of the separation layer and the outer current collector formed to surround an outer surface of the outer electrode active material layer,
the outer electrode includes the outer current collector formed to surround the outer surface of the separation layer and the outer electrode active material layer formed to surround an outer surface of the outer current collector,
the outer electrode includes the outer current collector formed to surround the outer surface of the separation layer and the outer electrode active material layer formed to surround the outer surface of the outer current collector and to come into contact with the separation layer, or
the outer electrode includes the outer electrode active material layer formed to surround the outer surface of the separation layer and the outer current collector formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the separation layer with spacing apart therefrom.

9. The cable-type secondary battery according to claim 1 , wherein the outer current collector is a pipe-type current collector, a wound wire-type current collector, a wound sheet-type current collector, or a mesh-type current collector.

10. The cable-type secondary battery according to claim 1 , wherein the inner current collector is made of stainless steel; aluminum; nickel; titanium; sintered carbon; 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.

11. The cable-type secondary battery according to claim 10 , wherein the conductive material is any one selected from polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, indium tin oxide (ITO), silver, palladium, and nickel, or mixtures thereof.

12. The cable-type secondary battery according to claim 10 , wherein the conductive polymer is a polymer of any one compound selected from polyacetylene, polyaniline, polypyrrole, polythiophene, and polysulfurnitride, or mixtures thereof.

13. The cable-type secondary battery according to claim 1 , wherein the outer current collector is made of stainless steel; aluminum; nickel; titanium; sintered carbon; 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; a conductive polymer; a metal paste comprising metal powders of Ni, Al, Au, Ag, Al, Pd/Ag, Cr, Ta, Cu, Ba or ITO; or a carbon paste comprising carbon powders of graphite, carbon black or carbon nanotube.

14. The cable-type secondary battery according to claim 1 , wherein the electrolyte comprises an electrolyte selected from a non-aqueous electrolyte solution using ethylene carbonate (EC), propylene carbonate (PC), butylene 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); and a gel-type polymer electrolyte using PEO, PVdF, PMMA, PAN or PVAC; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyethylene imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).

15. The cable-type secondary battery according to claim 1 , wherein the electrolyte further comprises a lithium salt.

16. The cable-type secondary battery according to claim 15 , wherein the lithium salt is any one 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, and lithium tetraphenylborate, or mixtures thereof.

17. The cable-type secondary battery according to claim 1 , wherein the inner electrode is an anode or a cathode, and the outer electrode is a cathode or an anode, opposite to the inner electrode.

18. The cable-type secondary battery according to claim 1 , wherein when the inner electrode is an anode and the outer electrode is a cathode,
the inner electrode active material layer comprises particles of any one active material selected from the group consisting of natural graphite, artificial graphite, or a carbonaceous material; lithium-containing titanium composite oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals (Me); oxides (MeOx) of the metals (Me); and composites of the metals (Me) and carbon, or mixtures thereof, and
the outer electrode active material layer comprises particles of any one active material selected from the group consisting of LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiCoPO 4 , LiFePO 4 , LiNiMnCoO 2 , and LiNi 1−x−y−z Co x M1 y M2 z O 2 (wherein each of M1 and M2 is, independently, any one selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z are, independently, atomic fractio

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• H01M4/75

  Wires, rods or strips · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/669

  Steels · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title