# US 2014/0193709 A1 · Binder for electrode of electrochemical element, composition for electrode of electrochemical element, electrode of electrochemical element and electrochemical element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0193709 A1 - Document ID: US20140193709A1 - Status: Published application - Kind: A1 - Application number: 14/128,240 - Filed: 2012-06-22 - Published: 2014-07-10 - Earliest claimed: 2011-06-24 - Assignees: Mitsubishi Rayon Co., Ltd. - Inventors: Haruki Okada; Daisuke Fujikawa; Mitsufumi Nodono; Fumino Momose; Ayako Shimonaka; Masakazu Itou; Akihiro Ishii; Hikaru Momose - Web page: https://patentgrep.com/patent/US20140193709A1 ## CPC - H01M 4/622: {being polymers} - H01G 11/38: Carbon pastes or blends; Binders or additives therein - H01G 11/28: arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives - H01G 11/30: characterised by their material - H01M 10/052: Li-accumulators - Y02E 60/10: Energy storage using batteries - Y02E 60/13: Energy storage using capacitors - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - 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 The invention relates to a binder for an electrode of an electrochemical element. The binder is a polymer having an N-vinyl formamide unit, which suppresses the decline of battery performances due to deterioration of binding property and increase of internal resistance of the battery and improves the battery performance. ## Claims ### Claim at position 1 -9. (canceled) ### Claim 10 A binder for an electrode of an electrochemical element, wherein the binder is a polymer having an N-vinyl formamide unit. ### Claim 11 (depends on 10) The binder for an electrode of an electrochemical element of claim 10, wherein the content of the N-vinyl formamide unit in the polymer is 10 mol % to 100 mol %. ### Claim 12 (depends on 10) The binder for an electrode of an electrochemical element of claim 10, wherein the binder is water-soluble. ### Claim 13 (depends on 10) The binder for an electrode of an electrochemical element of claim 10, wherein the content of the N-vinyl formamide unit in the polymer is 50 mol % to 100 mol %. ### Claim 14 (depends on 10) The binder for an electrode of an electrochemical element of claim 10, wherein the viscosity average molecular weight of the polymer is 10,000 to 10 million. ### Claim 15 (depends on 10) The binder for an electrode of an electrochemical element of claim 10, wherein the viscosity average molecular weight of the polymer is 10,000 to 8 million. ### Claim 16 (depends on 10) The binder for an electrode of an electrochemical element of claim 10, wherein the viscosity average molecular weight of the polymer is 50,000 to 5 million. ### Claim 17 (depends on 10) The binder for an electrode of an electrochemical element of claim 10, wherein the oxidation current value obtained with the cyclic voltammetry of Condition I below is 2 mA/g or less; using a three-electrode electrolytic cell of the following specification, the current value of the first cycle is determined with a scan speed of 1 mV/s and a scan range of 3.5 V to 5 V; the oxidation current value is obtained by dividing the current value at a voltage value of 4.8 V by the mass of a working electrode; {Specification of Three-Electrode Electrolytic Cell} working electrode: an electrode of a mixture layer containing 1 part by mass of a binder for an electrode and 1 part by mass of acetylene black is disposed between an aluminum foil and an aluminum mesh; reference electrode: a lithium foil; counter electrode: a lithium foil; electrolyte solution: 1 mol/L of a hexafluorophosphate lithium solution (solvent: ethylene carbonate/diethyl carbonate=1/2 (volume ratio)). ### Claim 18 (depends on 10) The binder for an electrode of an electrochemical element of claim 10, wherein the reduction current value obtained with the cyclic voltammetry of Condition II below is 5 mA/g or less; using a three-electrode electrolytic cell of the following specification, the current value of the first cycle is determined with a scan speed of 1 mV/s and a scan range of 3 V to 0 V; the reduction current value is obtained by dividing a current value at a voltage value of 0.5 V by the mass of a working electrode; {Specification of Three-Electrode Electrolytic Cell} working electrode: an electrode of a mixture layer containing 1 part by mass of a binder for an electrode and 1 part by mass of acetylene black is disposed between an aluminum foil and an aluminum mesh; reference electrode: a lithium foil; counter electrode: a lithium foil; electrolyte solution: 1 mol/L of a hexafluorophosphate lithium solution (solvent: ethylene carbonate/diethyl carbonate=1/2 (volume ratio)). ### Claim 19 (depends on 10) A composition for an electrode of an electrochemical element, wherein the composition contains the binder for an electrode of an electrochemical element of claim 10. ### Claim 20 (depends on 19) An electrode for an electrochemical element, including a current collector and a mixture layer disposed on the current collector, wherein the mixture layer contains the composition for an electrode of an electrochemical element of claim 19 and an electrode active material. ### Claim 21 (depends on 20) An electrochemical element, including the electrode for an electrochemical element of claim 20.