# US 8,785,020 B2 · Anode for cable-type secondary battery and cable-type secondary battery including the anode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,785,020 B2 - Document ID: US8785020B2 - Status: Granted - Kind: B2 - Application number: 13/540,024 - Filed: 2012-07-02 - Published: 2012-11-22 - Granted: 2014-07-22 - Earliest claimed: 2010-06-28 - Assignees: LG Chem, Ltd. - Applicants: Yo-Han Kwon; Je-Young Kim; Ki-Tae Kim; Heon-Cheol Shin; Hyung-Man Cho; Hye-Ran Jung - Inventors: Yo-Han Kwon; Je-Young Kim; Ki-Tae Kim; Heon-Cheol Shin; Hyung-Man Cho; Hye-Ran Jung - Web page: https://patentgrep.com/patent/US8785020B2 ## CPC - H01M 4/0452: {from solutions} - C25D 3/30: of tin - C25D 7/0607: {Wires} - H01M 4/134: Electrodes based on metals, Si or alloys - H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)} - H01M 4/75: Wires, rods or strips - H01M 4/78: Shapes other than plane or cylindrical, e.g. helical - H01M 10/0436: {Small-sized flat cells or batteries for portable equipment} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/058: Construction or manufacture - H01M 4/0442: {Anodisation, Oxidation (electrolytic coating by anodisation C25D9/00)} - H01M 4/667: {in the form of layers, e.g. coatings} - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract Disclosed is an anode for a lithium secondary battery. The anode includes a current collector in the form of a wire and a porous anode active material layer coated to surround the surface of the current collector. The three-dimensional porous structure of the active material layer increases the surface area of the anode. Accordingly, the mobility of lithium ions through the anode is improved, achieving superior battery performance. In addition, the porous structure allows the anode to relieve internal stress and pressure, such as swelling, occurring during charge and discharge of a battery, ensuring high stability of the battery while preventing deformation of the battery. These advantages make the anode suitable for use in a cable-type secondary battery. Further disclosed is a lithium secondary battery including the anode. ## Claims ### Claim 1 An anode for a cable-type secondary battery, comprising a core as a current collector and a porous shell as an anode active material coated to surround the outer surface of the core, the current collector having a horizontal cross section in a predetermined shape and extending in the lengthwise direction, wherein the porous shell has a pore size of 10 to 150 μm. ### Claim 2 (depends on 1) The anode according to claim 1, wherein the anode active material comprises at least one element or compound selected from the group consisting of Si, Sn, Li, Zn, Mg, Cd, Ce, Ni, Fe and oxides thereof. ### Claim 3 (depends on 2) The anode according to claim 2, wherein the anode active material is Si, Sn or a mixture thereof. ### Claim 4 (depends on 1) The anode according to claim 1, wherein the current collector is stainless steel, aluminum, titanium, silver, palladium, nickel, copper, or stainless steel surface treated with titanium, silver, palladium, nickel or copper. ### Claim 5 (depends on 1) The anode according to claim 1, wherein the current collector comprises a polymer core and a metal coating layer formed on the surface of the polymer core. ### Claim 6 (depends on 5) The anode according to claim 5, wherein the polymer core is made of at least one polymer selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, poly(sulfur nitride), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinyl alcohol (PVA), polyacrylate and polytetrafluoroethylene (PTFE). ### Claim 7 (depends on 5) The anode according to claim 5, wherein the metal coating layer is formed of at least one metal selected from titanium, silver, palladium, nickel and copper. ### Claim 8 (depends on 1) The anode according to claim 1, wherein the porous shell has a porosity of 60 to 95%. ### Claim 9 (depends on 1) The anode according to claim 1, wherein the porous shell has a surface area of 8×104 to 5×105 cm2/g. ### Claim 10 (depends on 1) A cable-type secondary battery comprising the anode according to claim 1. ### Claim 11 A cable-type secondary battery, comprising: an inner electrode as an anode comprising a core as a current collector and a porous shell as an anode active material coated to surround the outer surface of the core, the core having a horizontal cross section in a predetermined shape and extending in the lengthwise direction, wherein the porous shell has a pore size of 10 to 150 μm; an electrolyte layer as an ionic path filled to surround the inner electrode; an outer electrode as a cathode surrounding the outer surface of the electrolyte layer and comprising a pipe-like current collector having a horizontal cross section in a predetermined shape and a cathode active material layer formed on the current collector; and a protective cover disposed on the periphery of the outer electrode. ### Claim 12 (depends on 11) The cable-type secondary battery according to claim 11, wherein the cathode active material layer is formed of particles of at least one cathode active material LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiFePO4, LiNiMnCoO2 and 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 represent the atomic fractions of the corresponding constituent elements of the oxide and satisfy the relations of 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, x+y+z≦1). ### Claim 13 (depends on 11) The cable-type secondary battery according to claim 11, wherein the electrolyte layer is formed of a gel-type solid electrolyte using poly(ethylene oxide) (PEO), poly(vinylidene fluoride) (PVdF), poly(vinylidene fluoride-hexafluoro propylene) (PVdF-HFP), poly(methyl methacrylate) (PMMA), polyacrylonitrile (PAN) or PVAc (polyvinyl acetate), or a solid electrolyte using poly(ethylene oxide) (PEO), polypropylene oxide (PPO), polyethyleneimine (PEI), polyethylene sulphide (PES) or polyvinyl acetate (PVAc). ### Claim 14 (depends on 11) The cable-type secondary battery according to claim 11, wherein the electrolyte layer further comprises a lithium salt. ### Claim 15 (depends on 14) The cable-type secondary battery according to claim 14, wherein the lithium salt is selected from LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, chloroborane lithium, lithium lower aliphatic carboxylates, lithium tetraphenylborate, and mixtures of two or more thereof. ### Claim 16 A cable-type secondary battery, comprising: two or more inner electrodes as anodes arranged in parallel, each of which comprises a core as a current collector and a porous shell as an anode active material coated to surround the outer surface of the core, the core having a horizontal cross section in a predetermined shape and extending in the lengthwise direction; an electrolyte layer as an ionic path filled to surround the inner electrodes; an outer electrode as a cathode surrounding the outer surface of the electrolyte layer and comprising a pipe-like current collector and a cathode active material layer formed on the current collector; and a protective cover disposed on the periphery of the outer electrode. ### Claim 17 A cable-type secondary battery, comprising: two or more inner electrodes as anodes arranged in parallel, each of which comprises a core as a current collector, a porous shell as an anode active material coated to surround the outer surface of the core, the core having a horizontal cross section in a predetermined shape and extending in the lengthwise direction, and an electrolyte layer as an ionic path being formed on the outer surface of the shell; an outer electrode as a cathode comprising a cathode active material layer filled to surround the inner electrodes and a pipe-like current collector; and a protective cover disposed on the periphery of the outer electrode. ### Claim 18 A cable-type secondary battery, comprising: one or more anodes, each of which comprises a core as a current collector and a porous shell as an anode active material coated to surround the outer surface of the core, the core having a horizontal cross section in a predetermined shape and extending in the lengthwise direction, a first electrolyte layer as an ionic path being formed on the outer surface of the shell, wherein the porous shell has a pore size of 10 to 150 μm; one or more cathodes, each of which comprises a current collector and a cathode active material layer formed on the current collector, the current collector having a horizontal cross section in a predetermined shape and extending in the lengthwise direction; a second electrolyte layer as an ionic path allowing the anodes and the cathodes to be arranged in parallel and filled to surround the anodes and the cathodes; and a protective cover disposed on the periphery of the second electrolyte layer. ### Claim 19 A cable-type secondary battery, comprising: two or more anodes, each of which comprises a core as a current collector, a porous shell as an anode active material coated to surround the outer surface of the core, the core having a horizontal cross section in a predetermined shape and extending in the lengthwise direction, an electrolyte layer as an ionic path being formed on the outer surface of the shell, and a cathode active material layer being formed on the surface of the electrolyte layer; a current collector allowing the anodes to be arranged in parallel and filled to surround the anodes; and a protective cover disposed on the periphery of the current collector.