Cable-type secondary battery

The cable-type secondary battery according to claim 1, wherein the open-structured inner current collector is in the form of a wound wire or a mesh.

The cable-type secondary battery according to claim 1, wherein in the outer electrode,nthe outer electrode active material layer is formed to surround the outer surface of the separation layer, and the outer current collector is formed to surround the outer surface of the outer electrode active material layer;the outer current collector is formed to surround the outer surface of the separation layer, and the outer electrode active material layer is formed to surround the outer surface of the outer current collector;the outer current collector is formed to surround the outer surface of the separation layer, and the outer electrode active material layer is formed to surround the outer surface of the outer current collector and come into contact with the separation layer; orthe outer electrode active material layer is formed to surround the outer surface of the separation layer, and the outer current collector is 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.

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

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 the surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on the surface thereof; or a conductive polymer.

The cable-type secondary battery according to claim 1, wherein the outer current collector is made of 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; 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.

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); a gel polymer electrolyte using PEO, PVdF, PVdF-HEP, PMMA, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).

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

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

The cable-type secondary battery according to claim 1, wherein when the inner electrode is an anode and the outer electrode is a cathode,nthe inner electrode active material layer comprises an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material; lithium-titanium complex oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals; oxides (MeOx) of the metals; complexes of the metals and carbon; and mixtures thereof, andthe outer electrode active material layer comprises an active material selected from the group consisting of LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiFePO4, LiNiMnCoO2, LiNi1-x-y-zCoxM1yM2zO2 (wherein M1 and M2 are each independently 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 oxide-forming elements, in which 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and mixtures thereof.

The cable-type secondary battery according to claim 1, wherein the electrolyte-absorbing layer comprises a polymer selected from a gel polymer electrolyte using PEO, PVdF, PVdF-HFP, PMMA, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).

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

The cable-type secondary battery according to claim 1, wherein when the inner electrode is a cathode and the outer electrode is an anode,nthe inner electrode active material layer comprises an active material selected from the group consisting of LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiFePO4, LiNiMnCoO2, LiNi1-x-y-zCoxM1yM2zO2 (wherein M1 and M2 are each independently 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 oxide-forming elements, in which 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and mixtures thereof, andthe outer electrode active material layer comprises an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material; lithium-titanium complex oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals; oxides (MeOx) of the metals; complexes of the metals and carbon; and mixtures thereof.

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

The cable-type secondary battery according to claim 2, wherein in the outer electrode,nthe outer electrode active material layer is formed to surround the outer surface of the electrolyte-absorbing layer, and the outer current collector is formed to surround the outer surface of the outer electrode active material layer;the outer current collector is formed to surround the outer surface of the electrolyte-absorbing layer, and the outer electrode active material layer is formed to surround the outer surface of the outer current collector;the outer current collector is formed to surround the outer surface of the electrolyte-absorbing layer, and the outer electrode active material layer is formed to surround the outer surface of the outer current collector and come into contact with the absorbing layer; orthe outer electrode active material layer is formed to surround the outer surface of the electrolyte-absorbing layer, and the outer current collector is formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the electrolyte-absorbing layer with spacing apart therefrom.