# US 2019/0355993 A1 · Electrolytic copper foil and secondary battery using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0355993 A1 - Document ID: US20190355993A1 - Status: Published application - Kind: A1 - Application number: 16/242,451 - Filed: 2019-01-08 - Published: 2019-11-21 - Earliest claimed: 2018-05-16 - Assignees: Iljin Materials Co., Ltd. - Applicants: Iljin Materials Co., Ltd. - Inventors: Sun Hyoung LEE; Seul-Ki PARK; Tae Jin JO; Ki Deok SONG - Web page: https://patentgrep.com/patent/US20190355993A1 ## CPC - C25D 1/04: Wires; Strips; Foils - H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)} - H01M 10/052: Li-accumulators - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/42: Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells (H01M10/60 takes precedence) - H01M 2004/021: {Physical characteristics, e.g. porosity, surface area} - H05K 1/09: Use of materials for the {conductive, e.g. } metallic pattern - Y02E 60/10: Energy storage using batteries - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present disclosure provides an electrolytic copper foil composed of a single layer or a stack of two or more layers, wherein the electrolytic copper foil has Total Organic Carbon (TOC) content equal to or smaller than 4 ppm, and has chlorine (Cl) content equal to or smaller than 10 ppm, wherein the electrolytic copper foil has a thickness, a tensile strength, and an elongation satisfying a relationship 1 below: relationship 1: thickness (μm)/(tensile strength (kgf/mm2)*elongation (%))≤0.1. ## Claims ### Claim 1 An electrolytic copper foil composed of a single layer or a stack of two or more layers, wherein the electrolytic copper foil has Total Organic Carbon (TOC) content equal to or smaller than 4 ppm, and has chlorine (Cl) content equal to or smaller than 10 ppm, wherein the electrolytic copper foil has a thickness, a tensile strength, and an elongation satisfying a relationship 1 below: thickness (μm)/(tensile strength (kgf/mm2)*elongation (%))≤0.1. relationship 1 ### Claim 2 (depends on 1) The electrolytic copper foil of claim 1, wherein a breakage height obtained by an Erichsen test when the thickness of the electrolytic copper foil is 35 μm or larger is 3 mm or larger. ### Claim 3 (depends on 1) The electrolytic copper foil of claim 1, wherein the tensile strength of the electrolytic copper foil is 45 kgf/mm2 or larger, and the elongation of the copper foil is 3% or larger. ### Claim 4 (depends on 1) The electrolytic copper foil of claim 1, wherein a gloss (Gs (60°)) of the copper foil is 100 or larger. ### Claim 5 (depends on 1) An anode for a lithium secondary battery, wherein the anode includes an anode current collector, wherein the electrolytic copper foil of claim 1 is used as the anode current collector such that an anode active material is coated on the electrolytic copper foil at a loading level of 1.0 g/cm3 or greater. ### Claim 6 (depends on 1) A lithium secondary battery including a battery housing, an electrode assembly and an electrolytic solution, wherein the electrode assembly and electrolytic solution are accommodated in the battery housing, wherein the electrode assembly includes: an anode, wherein the anode includes an anode current collector, wherein the electrolytic copper foil of claim 1 is used as the anode current collector, wherein the anode includes an anode active material coated on the electrolytic copper foil; a cathode electrically connected to the anode and coated with a cathode active material containing a lithium compound; and a separator interposed between the anode and the cathode. ### Claim 7 (depends on 1) A printed circuit board having, on one face thereof, the electrolytic copper foil of claim 1. ### Claim 8 (depends on 2) An anode for a lithium secondary battery, wherein the anode includes an anode current collector, wherein the electrolytic copper foil of claim 2 is used as the anode current collector such that an anode active material is coated on the electrolytic copper foil at a loading level of 1.0 g/cm3 or greater. ### Claim 9 (depends on 3) An anode for a lithium secondary battery, wherein the anode includes an anode current collector, wherein the electrolytic copper foil of claim 3 is used as the anode current collector such that an anode active material is coated on the electrolytic copper foil at a loading level of 1.0 g/cm3 or greater. ### Claim 10 (depends on 4) An anode for a lithium secondary battery, wherein the anode includes an anode current collector, wherein the electrolytic copper foil of claim 4 is used as the anode current collector such that an anode active material is coated on the electrolytic copper foil at a loading level of 1.0 g/cm3 or greater. ### Claim 11 (depends on 2) A lithium secondary battery including a battery housing, an electrode assembly and an electrolytic solution, wherein the electrode assembly and electrolytic solution are accommodated in the battery housing, wherein the electrode assembly includes: an anode, wherein the anode includes an anode current collector, wherein the electrolytic copper foil of claim 2 is used as the anode current collector, wherein the anode includes an anode active material coated on the electrolytic copper foil; a cathode electrically connected to the anode and coated with a cathode active material containing a lithium compound; and a separator interposed between the anode and the cathode. ### Claim 12 (depends on 3) A lithium secondary battery including a battery housing, an electrode assembly and an electrolytic solution, wherein the electrode assembly and electrolytic solution are accommodated in the battery housing, wherein the electrode assembly includes: an anode, wherein the anode includes an anode current collector, wherein the electrolytic copper foil of claim 3 is used as the anode current collector, wherein the anode includes an anode active material coated on the electrolytic copper foil; a cathode electrically connected to the anode and coated with a cathode active material containing a lithium compound; and a separator interposed between the anode and the cathode. ### Claim 13 (depends on 4) A lithium secondary battery including a battery housing, an electrode assembly and an electrolytic solution, wherein the electrode assembly and electrolytic solution are accommodated in the battery housing, wherein the electrode assembly includes: an anode, wherein the anode includes an anode current collector, wherein the electrolytic copper foil of claim 4 is used as the anode current collector, wherein the anode includes an anode active material coated on the electrolytic copper foil; a cathode electrically connected to the anode and coated with a cathode active material containing a lithium compound; and a separator interposed between the anode and the cathode. ### Claim 14 (depends on 2) A printed circuit board having, on one face thereof, the electrolytic copper foil of claim 2. ### Claim 15 (depends on 3) A printed circuit board having, on one face thereof, the electrolytic copper foil of claim 3. ### Claim 16 (depends on 4) A printed circuit board having, on one face thereof, the electrolytic copper foil of claim 4.