METHOD OF ASSEMBLING HYBRID ELECTROCHEMICAL SYSTEM Russian patent published in 2016 - IPC H01G11/62 H01G11/84 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a hybrid supercapacitor, which includes at least one stage of assembling a negative electrode based on at least one nonporous carbon-based material and a positive electrode based on at least one porous carbon-based material, said electrodes being separated from one another by means of a separator impregnated with a liquid electrolyte comprising at least one lithium salt in solution in at least one solvent, then at least one first stage of charging, said method is characterised by that: a) a concentration of ionic lithium in liquid electrolyte before first charging stage is greater than or equal to 1.6 mol/l, b) lithium salt of liquid electrolyte comprises at least 50 wt% of a lithium salt chosen from LiFSI and a derivative thereof; c) solvent of liquid electrolyte has at least 80 vol% of a solvent chosen from cyclic alkyl carbonates, acyclic alkyl carbonates, lactones, esters, oxalanes and their mixtures, provided that said solvent comprises at least 20 vol% of ethylene carbonate; d) porous carbon-based material of positive electrode is chosen from materials in which mean dimension of pores is greater than 0.7 nm and which have a specific surface of greater than 700 m²/g e) nonporous carbon-based material is chosen from materials which are capable of inserting lithium ions and which have a specific surface of less than or equal to 150 m²/g; f) after assembling stage, charging of said hybrid supercapacitor is carried out in several successive charging stages up to a maximum voltage (U_max) of between 4 and 5 V and at a current density varying from 10 mA/g to 400 mA/g, each charging stage being separated from following charging stage by an intermediate stage of self-discharging or discharging at a current density of less than 5 mA/g.

EFFECT: increasing capacity of supercapacitor, service life of at least up to 500 cycles.

21 cl, 11 dwg, 2 tbl