RU2012129307A - METHOD OF OPERATION OF ELECTROCHEMICAL CONDENSERS - Google Patents

Abstract

A method of operating electrochemical capacitors with an aqueous alkaline electrolyte, a porous separator and electrodes, one of which contains an activated carbon material, and the other contains nickel hydroxide as an active material, including connecting the capacitor to a current source, charging it to a given voltage, terminating the charge and discharge , characterized in that the temperature of the capacitor is preliminarily measured, according to which the maximum operating voltage of the charge is determined, at which gas evolution is excluded, while the maximum charging voltage U is limited in accordance with the equation U = k t + b, where k and b are coefficients determined experimentally and depending on the design features of the capacitor, t is the temperature, and to measure the coefficients k and b, the trickle charge current i is calculated according to the equation, where i is the trickle charge current of the capacitor, A; F is the Faraday number, 96500 coulomb / mol; S is the area of the interelectrode gap , m; d - separator thickness torus, m; Z - constant, 10 mol · m · s - the ratio of specific electrical conductivity of the separator impregnated with electrolyte and electrolyte; then the coefficients k and b are determined, for which - the capacitor is thermostated at a temperature t1 and charged with a current i until a constant voltage U1 is established; - the capacitor is thermostated at a temperature t2 less than t1, but not lower than the freezing temperature electrolyte in the capacitor and charge it with current 1 until a constant voltage U2 is established in time; - calculate the constants k and b for equation (2) or find them graphically.

Claims (1)

A method of operating electrochemical capacitors with an aqueous alkaline electrolyte, a porous separator and electrodes, one of which contains activated carbon material, and the other contains nickel hydroxide as the active material, which includes connecting the capacitor to a current source, conducting its charge to a predetermined voltage, terminating the charge and discharging characterized in that the temperature of the capacitor is preliminarily measured, by which the maximum working charge voltage is determined at which r zovydelenie, wherein the maximum charge voltage limit U _max according to the equation U _max = k · t + b, where k and b are the coefficients determined experimentally and depending on the design features of the capacitor, t is the temperature, and for measuring the coefficients k and b, the continuous charge current i is calculated according to the equation $$i\le \frac{\mathrm{four}\cdot F\cdot S\cdot Z\cdot \lambda }{d\cdot {\lambda }_0}$$

, where i is the continuous charge current of the capacitor, A; F is the Faraday number, 96500 pendant / mol; S is the area of the interelectrode gap, m ² ; d is the thickness of the separator, m; Z - constant, 10 ^-10 mol · m ^-1 · s ^-1 $$\frac{\lambda }{{\lambda }_0}$$

- the ratio of the electrical conductivity of the separator impregnated with the electrolyte and the electrolyte; then determine the coefficients k and b, for which - thermostat the capacitor at a temperature t1 and charge it with current i until a constant voltage U1 is established in time; - thermostat the capacitor at a temperature t2 lower than t1, but not lower than the freezing temperature of the electrolyte in the capacitor and charge it with current 1 until a constant voltage U2 is established in time; - calculate the constants k and b for equation (2) or find them graphically.