# US 10,483,522 B2 · Lithium-ion secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,483,522 B2 - Document ID: US10483522B2 - Status: Granted - Kind: B2 - Application number: 15/127,290 - Filed: 2015-03-12 - Published: 2017-05-11 - Granted: 2019-11-19 - Earliest claimed: 2014-03-24 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Naoki Kurihara; Junpei Momo; Ryota Tajima - Web page: https://patentgrep.com/patent/US10483522B2 ## CPC - H01M 4/0445: {Forming after manufacture of the electrode, e.g. first charge, cycling} - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - H01M 4/582: {Halogenides} - 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 10/0567: characterised by the additives - H01M 10/0568: characterised by the solutes - H01M 10/0569: characterised by the solvents - H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties - H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop - Y02E 60/10: Energy storage using batteries - 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 ## Abstract A lithium-ion secondary battery with no negative electrode active material is provided. One embodiment of the present invention is a lithium-ion secondary battery including a positive electrode, a negative electrode, an electrolyte solution, and a separator between the positive electrode and the negative electrode. The negative electrode includes a negative electrode current collector which includes a region in direct contact with at least one of the electrolyte solution and the separator. The electrolyte solution contains fluorine. The negative electrode current collector has a function of making a deposit containing lithium to be deposited on a surface in charging. Furthermore, a spacer may be provided between the separator and the negative electrode. The electrolyte solution may contain an organic compound containing fluorine. Supply of fluorine from the electrolyte solution to lithium deposited on the surface of the negative electrode can suppress deposition of lithium dendrites (whiskers) in further deposition. ## Claims ### Claim 1 A secondary battery comprising: a positive electrode; a negative electrode comprising a negative electrode current collector; a separator between the positive electrode and the negative electrode; and a spacer between the separator and the negative electrode, wherein the negative electrode does not contain an active material layer, wherein the spacer has a spherical shape, wherein a material of the spacer is a polymer, and wherein the spacer is in direct contact with the negative electrode current collector. ### Claim 2 (depends on 1) The secondary battery according to claim 1, further comprising an electrolyte solution comprising fluorine. ### Claim 3 (depends on 2) The secondary battery according to claim 2, wherein the negative electrode current collector is in direct contact with the electrolyte solution. ### Claim 4 (depends on 1) The secondary battery according to claim 1, wherein the negative electrode current collector is capable of making a deposit on a surface in charging. ### Claim 5 (depends on 1) The secondary battery according to claim 1, wherein the negative electrode current collector is capable of making a deposit comprising lithium fluoride on a surface in charging. ### Claim 6 (depends on 2) The secondary battery according to claim 2, wherein the electrolyte solution comprises an organic compound comprising fluorine or an inorganic salt comprising fluorine, and wherein a weight ratio of the organic compound or the inorganic salt to the electrolyte solution is 2 wt % or more. ### Claim 7 (depends on 6) The secondary battery according to claim 6, wherein the organic compound is fluoroethylene carbonate. ### Claim 8 (depends on 6) The secondary battery according to claim 6, wherein the inorganic salt is lithium tetrafluoroborate or lithium hexafluorophosphate. ### Claim 9 A secondary battery comprising: a positive electrode; a negative electrode comprising a negative electrode current collector; a separator between the positive electrode and the negative electrode; and a spacer between the separator and the negative electrode, wherein the negative electrode does not contain an active material layer, wherein the spacer has a spherical shape, wherein a material of the spacer is a polymer, wherein the negative electrode current collector is in direct contact with the spacer, and wherein each of the positive electrode, the negative electrode, the separator and the spacer has flexibility. ### Claim 10 (depends on 9) The secondary battery according to claim 9, further comprising an electrolyte solution comprising fluorine. ### Claim 11 (depends on 10) The secondary battery according to claim 10, wherein the negative electrode current collector is in direct contact with the electrolyte solution. ### Claim 12 (depends on 10) The secondary battery according to claim 10, wherein the electrolyte solution comprises an organic compound comprising fluorine or an inorganic salt comprising fluorine, and wherein a weight ratio of the organic compound or the inorganic salt to the electrolyte solution is 2 wt % or more. ### Claim 13 (depends on 12) The secondary battery according to claim 12, wherein the organic compound is fluoroethylene carbonate. ### Claim 14 (depends on 12) The secondary battery according to claim 12, wherein the inorganic salt is lithium tetrafluoroborate or lithium hexafluorophosphate.