# US 2015/0147656 A1 · Negative electrode for lithium secondary batteries, lithium secondary battery, and method for producing the negative electrode for lithium secondary batteries > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0147656 A1 - Document ID: US20150147656A1 - Status: Published application - Kind: A1 - Application number: 14/400,973 - Filed: 2013-05-20 - Published: 2015-05-28 - Earliest claimed: 2012-05-22 - Assignees: Sanyo Electric Co., Ltd. - Applicants: SANYO Electric Co., Ltd. - Inventors: Yasutaka Kogetsu; Kunihiko Bessho; Takashi Shimada - Web page: https://patentgrep.com/patent/US20150147656A1 ## CPC - H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 4/0404: {by coating on electrode collectors} - H01M 4/0421: {involving vapour deposition} - H01M 4/0423: {Physical vapour deposition} - H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis} - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - H01M 4/139: Processes of manufacture - H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding - H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx - H01M 4/366: {as layered products} - H01M 10/052: Li-accumulators - H01M 50/534: characterised by the material of the leads or tabs - H01M 2004/027: {Negative electrodes} - H01M 2004/028: {Positive electrodes} - H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y10T 29/49224: with coating - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - 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 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A negative electrode 1 for lithium secondary batteries, which can increase the charge/discharge capacity of a lithium secondary battery, includes a negative electrode current collector, a negative electrode active material layer, and a lithium layer. The negative electrode active material layer is disposed on regions and of the respective surfaces and of the negative electrode current collector. The lithium layer is disposed on uncovered regions and, which are regions of the respective surfaces and of the negative electrode current collector on which the negative electrode active material layer is not disposed. The lithium layer includes lithium. ## Claims ### Claim 1 A negative electrode for lithium secondary batteries, the negative electrode comprising: a negative electrode current collector; a negative electrode active material layer disposed on a region of a surface of the negative electrode current collector; and a lithium layer including metal lithium, the lithium layer being disposed on an uncovered region, the uncovered region being a region of the surface of the negative electrode current collector on which the negative electrode active material layer is not disposed. ### Claim 2 (depends on 1) The negative electrode for lithium secondary batteries according to claim 1, the negative electrode further comprising a negative electrode lead connected to the uncovered region of the negative electrode current collector, wherein the lithium layer is disposed at least partially between the negative electrode lead and the negative electrode current collector. ### Claim 3 (depends on 1) The negative electrode for lithium secondary batteries according to claim 1, wherein the lithium layer has a thickness of 0.1 μm or more and 30 μm or less. ### Claim 4 (depends on 1) The negative electrode for lithium secondary batteries according to claim 1, wherein the negative electrode active material layer includes silicon. ### Claim 5 (depends on 1) The negative electrode for lithium secondary batteries according to claim 1, wherein a portion of the lithium layer is disposed on the negative electrode active material layer. ### Claim 6 (depends on 1) The negative electrode for lithium secondary batteries according to claim 1, wherein the uncovered region is located at an end of the negative electrode current collector in a longitudinal direction of the negative electrode current collector. ### Claim 7 (depends on 1) A lithium secondary battery comprising: the negative electrode for lithium secondary batteries according to claim 1; a positive electrode; a separator disposed between the positive electrode and the negative electrode for lithium secondary batteries; and a nonaqueous electrolyte. ### Claim 8 (depends on 7) The lithium secondary battery according to claim 7, wherein the positive electrode includes a positive electrode current collector, and a positive electrode active material layer disposed on the positive electrode current collector, and wherein a portion adjoining to the uncovered region does not face the positive electrode active material layer. ### Claim 9 A method for producing a negative electrode for lithium secondary batteries, the method comprising: forming a negative electrode active material layer on a region of a surface of a negative electrode current collector; and forming a lithium layer on a surface of the negative electrode active material layer and on an uncovered region, the uncovered region being a region of the surface of the negative electrode current collector on which the negative electrode active material layer is not disposed. ### Claim 10 (depends on 9) The method for producing a negative electrode for lithium secondary batteries according to claim 9, wherein the lithium layer is formed by a gas phase method. ### Claim 11 (depends on 9) The method for producing a negative electrode for lithium secondary batteries according to claim 9, the method further comprising joining a negative electrode lead onto the uncovered region with the lithium layer interposed between the negative electrode lead and the uncovered region by a resistance welding method.