# US 10,872,735 B2 · Supercapacitor of N—P doping porous graphene material in ionic liquid electrolyte and method for preparing thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,872,735 B2 - Document ID: US10872735B2 - Status: Granted - Kind: B2 - Application number: 16/203,560 - Filed: 2018-11-28 - Published: 2020-02-06 - Granted: 2020-12-22 - Earliest claimed: 2018-07-31 - Assignees: National Chung Shan Institute of Science and Technology - Applicants: National Chung-Shan Institute of Science and Technology - Inventors: Chien-Liang Chang; Wu-Ching Hung; Jeng-Kuei Chang; Bo-Rui Pan - Web page: https://patentgrep.com/patent/US10872735B2 ## CPC - H01G 11/32: Carbon-based - H01G 11/62: characterised by the solute, e.g. salts, anions or cations therein - H01G 11/24: characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor - H01G 11/26: characterised by their structure, e.g. multi-layered, porosity or surface features - H01G 11/36: Nanostructures, e.g. nanofibres, nanotubes or fullerenes - H01G 11/58: Liquid electrolytes - H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) - H01G 11/28: arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives - Y02E 60/13: Energy storage using capacitors - 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 ## Abstract A high volumetric energy and power density supercapacitor is provided. This supercapacitor includes a coin cell, a spring lamination, a working electrode, a counter electrode, a separator, and an ionic liquid electrolyte. The working and counter electrodes are N—P doping porous graphene coated on Al substrate. The ionic liquid electrolyte is EMI-FSI. The method of producing N—P doping porous graphene includes following steps: S1: Graphite oxide is quickly transferred into the furnace, which had been held at 300° C. and the porous graphene can be produced. S2: The porous graphene and red phosphorus are put together in the evacuated tube furnace and heated to 700° C. for 1 hr. S3: Heated to 800° C. for 30 min in a mixed argon and ammoniac atmosphere and then the N—P doping porous graphene can be made. The capacitance of the supercapacitor is 105 F/g and the volumetric power density is 1.19 kW/L. ## Claims ### Claim 1 A supercapacitor, comprising: a working electrode, comprising an active material of nitrogen-phosphorus (N—P) doping porous graphene; and an ionic liquid electrolyte, wherein a viscosity of the ionic liquid electrolyte is less than 60 mPa·s, a conductivity of the ionic liquid electrolyte is greater than 0.5 S/m, a diameter of anions of the ionic liquid electrolyte is less than 0.7 nm, and a diameter of cations of the ionic liquid electrolyte is less than 0.7 nm. ### Claim 2 (depends on 1) The supercapacitor of claim 1, wherein the cations of the ionic liquid electrolyte comprise 1-Ethyl-3-methylimidazolium (EMI), N-methyl-N-propylpyrrolidinium (PMP), N-butyl-N-methylpyrrolidinium (BMP), or any combination thereof. ### Claim 3 (depends on 1) The supercapacitor of claim 1, wherein the anions of the ionic liquid electrolyte comprise one selected from a group consisting of Bis(fluorosulfonyl) imide (FSI), bis(trifluoromethylsulfony)imide (TFSI), tetrafluoroborate (BF4), and any combination thereof. ### Claim 4 (depends on 1) The supercapacitor of claim 1, wherein the working electrode comprises a conductive substrate, and the active material is deposited on the conductive substrate. ### Claim 5 (depends on 1) The supercapacitor of claim 1, wherein the active material comprises a porous graphene surface doped with more than 3 at % of nitrogen and more than 1 at % of phosphorus. ### Claim 6 A method for preparing a supercapacitor, comprising: preparing an active material comprising nitrogen-phosphorus (N—P) doping porous graphene; depositing the active material on a conductive substrate to form a working electrode; and adsorbing an ionic liquid electrolyte on a surface of the working electrode having the active material, wherein a viscosity of the ionic liquid electrolyte is less than 60 mPa·s, a conductivity of the ionic liquid electrolyte is greater than 0.5 S/m, a diameter of anions of the ionic liquid electrolyte is less than 0.7 nm, and a diameter of cations of the ionic liquid electrolyte is less than 0.7 nm. ### Claim 7 (depends on 6) The method for preparing the supercapacitor of claim 6, wherein the cations of the ionic liquid electrolyte comprise 1-Ethyl-3-methylimidazolium (EMI), N-methyl-N-propylpyrrolidinium (PMP), N-butyl-N-methylpyrrolidinium (BMP), or any combination thereof. ### Claim 8 (depends on 6) The method for preparing the supercapacitor of claim 6, wherein the anions of the ionic liquid electrolyte comprise Bis(fluorosulfonyl) imide (FSI), bis(trifluoromethylsulfony)imide (TFSI), tetrafluoroborate (BF4), or any combination thereof. ### Claim 9 (depends on 6) The method for preparing the supercapacitor of claim 6, wherein the active material is deposited on the conductive substrate by a blade coating method. ### Claim 10 (depends on 6) The method for preparing the supercapacitor of claim 6, wherein preparing the active material comprising the N—P doping porous graphene further comprises following sub-steps: placing porous graphene and red phosphorus in a vacuum environment, and raising a temperature to 700° C. in one hour to form a phosphorus doping porous graphene; and placing the phosphorus doping porous graphene in an ammonia environment or an argon environment, and raising a temperature to 800° C. in thirty minutes to form the active material. ### Claim 11 (depends on 6) The method for preparing the supercapacitor of claim 6, further comprising electrically activating the working electrode with the ionic liquid electrolyte adsorbed thereon.