Cable-type secondary battery

• US 9,219,291 B2
• Filed: 09/11/2013
• Issued: 12/22/2015
• Est. Priority Date: 03/11/2011
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kwon, Yo-Han, Kim, Je-Young, Woo, Sang-Wook, Shin, Heon-Cheol, Kim, Eun-Ji, Park, Su-Jin, Choi, Woo-Sung
• Primary Examiner(s): Walls, Cynthia K
• Application Number:
  US14/023,786
• Publication Number:
  US 20140030569A1
• Time in Patent Office: 832 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H01M 10/02 Details of electrodes H01M4/00; of non-active parts H01M50/00
• CPC Class Codes: H01M 10/05 Accumulators with non-aqueous electrolyte H01M10/39 takes precedence
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 10/0568 characterised by the solutes
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 2004/022 Electrodes made of one single microscopic fiber
• CPC Class Codes: H01M 4/04 Processes of manufacture in general
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/5825 Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• CPC Class Codes: H01M 4/66 Selection of materials
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/662 Alloys collectors of lead alloys H01M4/685
• CPC Class Codes: H01M 4/663 containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
• CPC Class Codes: H01M 4/666 : in the form of mixed materials H01M4/668 takes precedence
• CPC Class Codes: H01M 4/668 : Composites of electroconductive material and synthetic resins
• CPC Class Codes: H01M 4/75 : Wires, rods or strips
• CPC Class Codes: H01M 4/78 : Shapes other than plane or cylindrical, e.g. helical
• CPC Class Codes: H01M 6/34 : Immersion cells, e.g. sea-water cells
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

Abstract

The present invention provides a cable-type secondary battery comprising an inner electrode which includes at least one first polarity electrode having a first polarity current collector with a long and thin shape, whose cross-section perpendicular to its longitudinal direction is a circular, oval or polygonal form; a first polarity electrode active material layer formed on an outer surface of the first polarity current collector; and an electrolyte layer filled to surround the first polarity electrode active material layer, and at least one wire-type second polarity electrode which wholly surrounds the inner electrode and is winding around the exterior thereof.

Thus, the inventive cable-type secondary battery provided with an outer winding electrode has excellent flexibility to prevent the release of the active material.

Claims

1. A cable-type secondary battery comprising:

an inner electrode which includes at least one first polarity electrode having a first polarity current collector with a long and thin shape, whose cross-section perpendicular to its longitudinal direction is a circular, oval or polygonal form;

a first polarity electrode active material layer formed on an outer surface of the first polarity current collector; and

an electrolyte layer filled to surround the first polarity electrode active material layer, and

at least one wire-type second polarity electrode which wholly surrounds the inner electrode and is winding around the exterior thereof.

2. The cable-type secondary battery of claim 1, wherein the first polarity electrode active material layer formed on the outer surface of the first polarity current collector comprises at least two first polarity electrode active material layers to be spaced apart from each other at a predetermined interval in the longitudinal direction.

3. The cable-type secondary battery of claim 1, wherein the first polarity electrode active material layer comprises an active material selected from the group consisting of LiCoO₂, LiNiO₂, LiMn₂O₄, LiCoPO₄, LiFePO₄, LiNiMnCoO₂, LiNi_1-x-y-zCo_xM1_yM2_zO₂ (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 a mixture thereof.

4. The cable-type secondary battery of claim 1, wherein the second polarity electrode comprises an active material layer made of an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material;

lithium-titanium complex oxide (LTO), a metal (Me) such as Si, Sn, Li, Zn, Mg, Cd, Ce, Ni or Fe;

an alloy of the metals;

a metal oxide (MeOx) of the metal;

a complex of the metal and carbon; and

a mixture thereof.

5. The cable-type secondary battery of claim 1, wherein the first polarity current collector and a current collector of the second polarity electrode comprises one selected from the group consisting 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; and

a conductive polymer.

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

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

8. The cable-type secondary battery of claim 1, wherein the electrolyte layer comprises one selected from a group consisting of 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 sulfide (PES) or polyvinyl acetate (PVAc).

9. The cable-type secondary battery of claim 1, wherein the electrolyte layer further comprises a lithium salt.

10. The cable-type secondary battery of claim 9, wherein the lithium salt is selected from the group consisting of LiCl, LiBr, LiI, LiClO₄, LiBF₄, LiB₁₀Cl₁₀, LiPF₆, LiCF₃SO₃, LiCF₃CO₂, LiAsF₆, LiSbF₆, LiAlCl₄, CH₃SO₃Li, CF₃SO₃Li, (CF₃SO₂)₂NLi, chloroborane lithium, lower aliphatic lithium carbonate, lithium tetraphenylborate, and a mixture thereof.

11. The cable-type secondary battery of claim 1, wherein the first polarity is a cathode and the second polarity is an anode.