FLEXIBLE HYBRID ELECTRODE FOR SUPERCAPACITOR AND METHOD FOR ITS PRODUCTION Russian patent published in 2021 - IPC H01G11/30 H01M4/04 

FIELD: energy storage devices.

SUBSTANCE: invention relates to the creation of new flexible hybrid electrodes for polymer-based supercapacitors with a poly-voltage system, it can be used in the creation of portable energy storage devices. The flexible electrode for the supercapacitor consists of a current-carrying substrate made of anodized graphite foil, an electroactive composite coating based on polyaniline and a carbon filler – chemically activated in the presence of potassium hydroxide during infrared pyrolysis polyacrylonitrile IR-PAN with graphite-like layer structure with a specific surface area of 2000-3000 m²/g, a pore volume of 0.3-1.3 cm³ and a conductivity of 1.5 Sm/cm. The content of components in the electroactive composite coating, wt. % is following: IR-PAN – 5-15, polyaniline – the rest. A method for producing a flexible electrode for a supercapacitor involves applying an electroactive coating to a conductive graphite foil substrate by electropolymerization of aniline from an electrolyte - 3-7 wt.% aniline sulfate solution in 1M H₂SO₄. The foil is pre-anodized in 0.1 wt. % (NH₄)₂SO₄ for 3-5 minutes. In the electrolyte, carbon filler – IR-PAN is pre-suspended and the resulting suspension is treated with ultrasound at a frequency of 35 kHz, with a power of 20-50 W for 20-40 minutes. Electropolymerization is carried out at potential values from -0.7 to +1 V (relatively to the Ag/AgCl electrode), preferably for 20-50 charge-discharge cycles. The electrode is preferably pre-developed by cycling at potential sweep rates of 50-200 mV/s for 500 charge-discharge cycles.

EFFECT: increased electrochemical capacity, Coulomb efficiency, and stability of the flexible electrode during long charge-discharge cycles with ease of its production.

4 cl, 8 ex, 4 dwg