Cable-type secondary battery

Patent metadata

Field	Value
Publication number	US-9306236-B2
Application number	US-201414242952-A
Country	US
Kind code	B2
Filing date	Apr 2, 2014
Priority date	Oct 13, 2011
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

Disclosed herein is a cable-type secondary battery having a horizontal cross section of a predetermined shape and extending longitudinally, comprising: a core for supplying lithium ions, which comprises an electrolyte; an inner electrode, comprising an open-structured inner current collector surrounding the outer surface of the core for supplying lithium ions, an inner electrode active material layer formed on the surface of the inner current collector, and a first electrolyte-absorbing layer formed on the outer surface of the inner electrode active material layer; a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; a second electrolyte-absorbing layer formed on the surface of the separator; and an outer electrode surrounding the outer surface of the second electrolyte-absorbing layer and comprising an outer electrode active material layer and an outer current collector.

First claim

What is claimed is:

1. A cable-type secondary battery comprising:
a core including an electrolyte for supplying lithium ions;
an inner electrode, comprising an open-structured inner current collector surrounding an outer surface of the core for supplying lithium ions, an inner electrode active material layer formed on a surface of the inner current collector, and a first electrolyte-absorbing layer formed on an outer surface of the inner electrode active material layer;
a separation layer surrounding an outer surface of the inner electrode to prevent a short circuit between electrodes;
a second electrolyte-absorbing layer formed on a surface of the separation layer; and
an outer electrode surrounding an outer surface of the second electrolyte-absorbing layer and comprising an outer electrode active material layer and an outer current collector.

2. 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.

3. The cable-type secondary battery according to claim 1 , wherein in the outer electrode,
the outer electrode active material layer is formed to surround the outer surface of the second electrolyte-absorbing layer, and the outer current collector is formed to surround the outer surface of an outer electrode active material layer;
the outer current collector is formed to surround the outer surface of the second electrolyte-absorbing layer, and the outer electrode active material layer is formed to surround an outer surface of the outer current collector;
the outer current collector is formed to surround the outer surface of the second 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 second electrolyte-absorbing layer; or
the outer electrode active material layer is formed to surround the outer surface of the second 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 second electrolyte-absorbing layer with spacing apart therefrom.

4. 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.

5. 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.

6. The cable-type secondary battery according to claim 5 , wherein the conductive material is selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, indium tin oxide (ITO), silver, palladium, nickel, and mixtures thereof.

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

8. 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 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.

9. 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).

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

11. The cable-type secondary battery according to claim 10 , wherein the lithium salt is 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 , LiShF 6 , LiAlCl 4 , CH 3 SO 3 L 1 , CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and mixtures thereof.

12. 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.

13. 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 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, and
the outer electrode active material layer comprises an active material 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 (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.

14. The cable-type secondary battery according to claim 1 , wherein the first electrolyte-absorbing layer and the second electrolyte-absorbing layer each independently comprise a polymer selected from 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).

15. The cable-type secondary battery according to claim 1 , wherein the first electrolyte-absorbing layer and the second electrolyte-absorbing layer each independently further comprise a lithium salt.

16. The cable-type secondary battery according to claim 15 , wherein the lithium salt is 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 , LiShF 6 , LiAlCl 4 , CH 3 SO 3 L 1 , CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and mixtures thereof.

17. The cable-type secondary battery according to claim 1 , wherein when the inner electrode is a cathode and the outer electrode is an anode,
the inner electrode active material layer comprises an active material selected from the group consisting of LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiCoPO 4 , LiFePO 4

Assignees

• Lg Chemical Ltd

Inventors

• Kwon Yo-Han
• Woo Sang-Wook
• Jung Hye-Ran
• Kim Je-Young
• Kim In-Chul

Classifications

• H01M4/66

  Selection of materials · CPC title

• H01M10/0565

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

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title