Cable-type secondary battery

Patent metadata

Field	Value
Publication number	US-9236629-B2
Application number	US-201113291407-A
Country	US
Kind code	B2
Filing date	Nov 8, 2011
Priority date	Feb 1, 2010
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

The present invention relates to a cable-type secondary battery comprising an inner electrode comprising at least two anodes arranged in parallel, the anode extending longitudinally and having a horizontal cross section of a predetermined shape, the anode having an electrolyte layer thereon serving as an ion channel; an outer electrode comprising a cathode including a cathode active material layer surrounding the inner electrode; and a protection coating surrounding the outer electrode. The cable-type secondary battery has free shape adaptation due to its linearity and flexibility. A plurality of inner electrodes within a tubular outer electrode lead to an increased contact area therebetween and consequently a high battery rate. It is easy to control the capacity balance between the inner and outer electrodes by adjusting the number of inner electrodes. A short circuit is prevented due to the electrolyte layer formed on the inner electrode.

First claim

What is claimed is:

1. A cable secondary battery comprising:
an inner electrode comprising at least two anodes arranged in parallel and spaced from one another, each of the anodes including a current collector and an anode active material on an outer surface of the current collector and extending longitudinally and having a horizontal cross section of a predetermined shape, each of the anodes having a respective electrolyte layer thereon serving as an ion channel, each respective electrolyte layer surrounding a respective current collector;
an outer electrode comprising a cathode including a cathode active material layer and a hollow current collector disposed about the cathode active material layer, the cathode active material layer surrounding the inner electrode, the cathode being arranged in parallel with the at least two anodes; and
a protection coating surrounding the outer electrode.

2. A cable secondary battery comprising:
an inner electrode comprising at least two cathodes arranged in parallel and spaced from one another, each of the cathodes including a current collector and a cathode active material on an outer surface of the current collector and extending longitudinally and having a horizontal cross section of a predetermined shape, each of the cathodes having an electrolyte layer thereon serving as an ion channel, each respective electrolyte layer surrounding a respective current collector;
an outer electrode comprising an anode including an anode active material layer, the anode active material layer surrounding the inner electrode, the anode being arranged in parallel with the at least two cathodes; and
a protection coating surrounding the outer electrode.

3. The cable secondary battery according to claim 1 ,
wherein the horizontal cross section of each of the anodes is a circular or polygonal shape.

4. The cable-type secondary battery according to claim 1 ,
wherein the cathode has a cross section of a circular or polygonal shape.

5. The cable secondary battery according to claim 1 ,
wherein the current collectors of the anodes are made from stainless steel, aluminum, nickel, titanium, sintered carbon, and copper; stainless steel surface-treated with carbon, nickel, titanium, and silver; aluminum-cadmium alloys; non-conductive polymer surface-treated with a conductive material; or conductive polymers.

6. The cable secondary battery according to claim 5 ,
wherein the conductive material is any one selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfur nitride, indium thin oxide (ITO), silver, palladium, nickel, copper, and mixtures thereof.

7. The cable secondary battery according to claim 5 ,
wherein the conductive polymer is any one selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfur nitride, and mixtures thereof.

8. The cable secondary battery according to claim 1 ,
wherein the anode active material layer is formed from an active material including an active material particle of any one selected from the group consisting of carbonaceous materials; lithium-containing titanium composite oxides (LTOs); 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, and mixtures thereof.

9. The cable secondary battery according to claim 1 ,
wherein the hollow current collector is made from stainless steel, aluminum, nickel, titanium, sintered carbon, and copper; stainless steel surface-treated with carbon, nickel, titanium, and silver; aluminum-cadmium alloys; non-conductive polymers surface-treated with a conductive material; or conductive polymers.

10. The cable secondary battery according to claim 9 ,
wherein the conductive material is any one selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfur nitride, indium thin oxide (ITO), silver, palladium, nickel, copper, and mixtures thereof.

11. The cable secondary battery according to claim 9 ,
wherein the conductive polymer is any one selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfur nitride, and mixtures thereof.

12. The cable secondary battery according to claim 1 ,
wherein the cathode active material layer is formed from an active material including an active material particle of any one selected from the group consisting of LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiCoPO 4 , LiFePO 4 , LiNiMnCoO 2 , LiNi 1-x-y-z Co x M1 y M2 z O 2 , and mixtures, wherein M1 and M2 are each 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 each independently an atomic fraction of each component in the oxide, where 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, x+y+z≦1.

13. The cable secondary battery according to claim 1 ,
wherein each respective electrolyte layer is formed a gel polymer electrolyte of PEO, PVdF, PMMA, PAN, or PVAc; or a solid electrolyte of PEO, polypropylene oxide (PPO), polyethylene imine (PEI), polyethylene sulphide (PES) or PVAc.

14. The cable secondary battery according to claim 1 ,
wherein each respective electrolyte layer further comprises a lithium salt.

15. The cable secondary battery according to claim 14 ,
wherein the lithium salt is any one selected from the group consisting of 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, chlorine borane lithium, aliphatic lower lithium carbonate, tetra-phenyl lithium borate, and mixtures thereof.

16. The cable secondary battery according to claim 1 , wherein the inner electrode is surrounded by the outer electrode.

17. The cable secondary battery according to claim 1 , wherein the cathode active material layer is concentric with the hollow current collector.

18. The cable secondary battery according to claim 1 , wherein the at least two anodes are not in contact with one another and separated by the cathode active material layer.

19. The cable secondary battery according to claim 1 , wherein each of the at least two anodes is individually covered with a designated electrolyte layer circumferentially disposed thereabout.

Assignees

• Kwon Yo-Han
• Kim Je-Young
• Oh Byung-Hun
• Kim Ki-Tae
• Lg Chemical Ltd

Inventors

• Kwon Yo-Han
• Kim Je-Young
• Oh Byung-Hun
• Kim Ki-Tae

Classifications

• H01M10/0525

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

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/70

  characterised by shape or form · CPC title

• H01M4/131

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