# US 10,504,663 B2 · Electrochemical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,663 B2 - Document ID: US10504663B2 - Status: Granted - Kind: B2 - Application number: 15/936,184 - Filed: 2018-03-26 - Published: 2018-10-04 - Granted: 2019-12-10 - Earliest claimed: 2017-03-28 - Assignees: Taiyo Yuden Co., Ltd. - Applicants: Taiyo Yuden Co., Ltd. - Inventors: Yuki Kawai; Koji Kano - Web page: https://patentgrep.com/patent/US10504663B2 ## CPC - H01G 11/50: specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation - H01G 11/06: with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] - H01G 11/28: arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives - H01G 11/52: Separators - H01G 11/58: Liquid electrolytes - H01G 11/70: characterised by their structure - H01G 11/82: Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations - H01G 11/84: Processes for the manufacture of hybrid or EDL capacitors, or components thereof - H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An electrochemical device has a positive electrode, a negative electrode, separators, and an electrolyte. The negative electrode has: a negative-electrode collector having a first principal face and a second principal face on the opposite side of the first principal face; a first negative-electrode active-material layer formed on the first principal face; and a second negative-electrode active-material layer which is formed intermittently on the second principal face and whose density of negative-electrode active material is lower than that of the first negative-electrode active-material layer. In the electrolyte, the positive electrode, negative electrode, and separators are immersed. The electrochemical device is such that the first and second negative-electrode active-material layers are pre-doped with lithium ions as a metallic lithium is electrically connected to the second principal face where the second negative-electrode active-material layer is not formed, and then immersed in the electrolyte. ## Claims ### Claim 1 An electrochemical device, comprising: a positive electrode having: a positive-electrode collector made of conductive material; and a positive-electrode active-material layer formed on the positive-electrode collector; a negative electrode having: a negative-electrode collector made of conductive material and having a first principal face and a second principal face on an opposite side of the first principal face; a first negative-electrode active-material layer formed on the first principal face; and a second negative-electrode active-material layer which is formed intermittently on the second principal face and has a density of negative-electrode active material which is lower than that of the first negative-electrode active-material layer; separators that insulate the positive electrode and the negative electrode; and an electrolyte in which the positive electrode, negative electrode, and separators are immersed; wherein an uncoated area of the second principal face where the second negative-electrode active-material layer is not formed has a first uncoated area where a metallic lithium is attached to, and thus electrically connected to, the uncoated area and immersed in the electrolyte, to pre-dope the first and second negative-electrode active-material layers with lithium ions, wherein the first and second negative-electrode active-material layers are pre-doped with lithium ions derived from the metallic lithium. ### Claim 2 (depends on 1) The electrochemical device according to claim 1, wherein the density of the negative-electrode active material of the second negative-electrode active-material layer is lower than that of the first negative-electrode active-material layer by 10% or more. ### Claim 3 (depends on 1) The electrochemical device according to claim 1, wherein the second negative-electrode active-material layer is thicker than the first negative-electrode active-material layer. ### Claim 4 (depends on 3) The electrochemical device according to claim 3, wherein the second negative-electrode active-material layer is thicker than the first negative-electrode active-material layer by 5% or more. ### Claim 5 (depends on 1) The electrochemical device according to claim 1, wherein the negative-electrode collector is made of copper. ### Claim 6 (depends on 1) The electrochemical device according to claim 1, wherein the negative-electrode collector has multiple through holes. ### Claim 7 (depends on 1) The electrochemical device according to claim 1, wherein the positive electrode and the negative electrode are stacked and wound together with the separators in between. ### Claim 8 (depends on 7) The electrochemical device according to claim 7, wherein an electrode on an outermost side of winding is the negative electrode, and the second principal face faces outward, wherein the first uncoated area is provided on the outermost side of winding.