SUPERCAPACITOR BASED ON NANOSTRUCTURED CARBON MATERIAL Russian patent published in 2024 - IPC H01G11/34 H01G11/60 B82Y30/00 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering, namely to supercapacitors with a double electric layer, and can be used for making electrodes from porous nanostructured carbon materials with different types of porous structure (micro-, micro-meso- or mesoporous), obtained by activating lignocellulose material with orthophosphoric acid. Supercapacitor electrodes are made of material containing, wt.%: polytetrafluoroethylene 3–8, carbon nanotubes 1–12, balance – nanostructured porous carbon material, which has microporous or micro-mesoporous or mesoporous structure, and also contains phosphorus in form of P-containing functional groups in amount of 0.5–5.0 wt.%, wherein the electrodes are immersed in a non-aqueous electrolyte of the ionic liquid BMIMBF₄ in acetonitrile. Supercapacitor has an operating voltage of 2.7 V, has a mass capacity at a charging/discharging current density of 0.6 A/g 19.5–32.1 F/g, volumetric capacity of 13.8–24.3 F/cm³ and reduction of specific capacity for 5,000 continuous charging/discharging cycles at discharge current density of 2 A/g, which is 8–15%.

EFFECT: high energy efficiency and stability of the supercapacitor.

2 cl, 16 ex