CARBONACEOUS ELECTRODE FOR ELECTRIC DOUBLE-LAYER CAPACITOR AND MANUFACTURING METHOD THEREOF

• Main Authors: TAMURA KATSUMI, NAKAMURA HITOSHI, KUWAGAKI HITOSHI, OKAMURA MICHIO
• Format: Patent
• Language: English
• Published: 13.10.2005
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

PROBLEM TO BE SOLVED: To provide a non-porous carbonaceous electrode which shows an expansion coefficient which has been reduced when the electric field is activated, and to also reduce an expansion coefficient of the electric double-layer capacitor by combining such non-porous carbonaceous electrode with a particular electrolyte. SOLUTION: The carbonaceous electrode for electric double-layer capacitor can be obtained with the method comprising the step that the carbon powder having the fine hole volume of 0.01 to 0.1 ml/g in the fine grain size of 0.8 nm or less can be obtained by baking needle coke green powder for 2 to 4 hours at 600 to 900°C under the non-active atmosphere, mixing the baked powder with alkali hydroxide powder in the amount of 1.8 to 2.2 times in the weight ratio, baking the mixed powders for 2 to 4 hours at 650 to 850°C under the non-active atmosphere, and removing and drying the alkali hydroxide through cleaning of the baked and mixed powders and the step that the carbonate powder is formed. COPYRIGHT: (C)2006,JPO&NCIPI