UNIV. NEWS. NORTH-CAUCAS. REG. TECHNICAL SCIENCES SERIES. 2022; 2: 85-92
http://dx.doi.org/10.17213/1560-3644-2022-2-85-92
NEW COMPOSITE ELECTRODE TECHNOLOGIES FOR ELECTROCHEMICAL CAPACITORS
Kuznetsov Denis N. – Competitor, Department «Chemical Technology».
Lipkin Valery M. – Candidate of Technical Sciences, Associate Professor, Department «Chemical Technology», ipkin@yandex.ru
Moskalev Yuri G. – Master Student, Department «Chemical Technology».
Korbova Ekaterina V. – Graduate Student, Department «Chemical Technology», war_wara@inbox.ru
Grishin Timur V.– Master Student, Department «Chemical Technology».
Mokrievich Igor A. – Master Student, Department «Chemical Technology».
Kuznetsov Oleg E. – Master Student, Department «Chemical Technology».
Abstract
The purpose of this work was to investigate the capabilities of composite nickel- ultradispersed nickel powder and graphite foil containing highly porous particles of thermally expanded and oxidized graphite. As a result of the research it was found that the composite electrode nickel coating - nickel powder - nickel hydroxide is a promising electrode for electrochemical capacitors with specific capacitive capacity up to 1300 F/g, and for alkaline batteries with specific capacity 219 mAh/g. High specific characteristics are achieved with a dispersed phase content of 0.3 to 5% in the composite coating, with nickel hydroxide content of 0.005-0.07 g/cm2. Graphite foil is the base for the nickel hydroxide coating, providing a specific capacitance of more than 2000 F/g and a specific Faraday capacitance of 229 mAh/g. The high specific characteristics of the material are ensured by the graphite oxide, which provides partially chemical oxidation of the nickel hydroxide. The graphite foil electrode is not susceptible to self-discharge due to its high adsorption capacity towards oxygen which provides chemical oxidation of the nickel hydroxide during storage.
Keywords: composite coatings, composite electrode, ultradispersed nickel powder, potentiometric methods
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