Электрохимические конденсаторы

The cyclic voltammetry was used to study the behavior of a symmetric supercapacitor with activated carbon cloth electrodes and a solution of an ionic liquid (C₈H₁₅N₂PF₆) in freon-22 as an electrolyte in the temperature range from ? 140 to + 130°C. The measurements were carried out in a special autoclave. At temperatures above 90°C, the supercapacitor exhibits purely capacitive behavior, whereas at the temperature lowering, the influence of resistance strongly increases.

The electrochemical characteristics of electrodes based on various fibrous carbon materials (manufactured by OOO NPTs Uvikom) for hybrid supercapacitors C/PbO₂ with an acid electrolyte have been investigated. It is shown that the highest values of the capacitive characteristics of the electrodes were obtained using carbon activated felt UVIS-AK-V-170, characterized by capacities up to 400 F/g.

In this paper, the electrochemical and electrophysical properties of protonated potassium polytitanate synthesized at pH values varying from 3.11 to 8.88 depending on the magnitude of the polarization voltage and the magnitude of the measured signal were studied by the method of impedance spectroscopy. The values of effective conductivity, relaxation times, frequency dependences of the loss tangent, and dielectric permittivity are determined.

4 августа 2019 г. исполнилось 90 лет известному в нашей стране специалисту в области электрохимической энергетики, выдающему организатору аккумуляторной промышленности Владимиру Никодимовичу Леонову.

13–14 февраля на площадке тольяттинского технопарка «Жигулевская долина» состоялась вторая Международная научно-техническая конференция «Battery Innovation 2020». Ее организаторами выступили Группа компаний «АКОМ» и научно-технический центр «Аккумулятор инноваций». Сегодня эту конференцию можно смело назвать традиционной ежегодной встречей научно-технической элиты в сфере производства и переработки химических источников тока.

The results of the study of electrochemical dispersion of flake graphite in sulfuric acid were presented. It was shown that the highest dispersion efficiency was achieved while using large fractions of graphite with a particle size being more than 200 microns. The formation of the multilayer graphene oxide structures with the thickness of 0.1–1.0 microns and lateral dimensions up to 100 microns during anodic oxidation of graphite was established. The graphene structures were identified by the x-ray phase analysis and IR-Fourier spectroscopy.

The energy characteristics of prototypes of supercapacitors with carbon fabric electrodes Busofit T-040 were studied depending on the concentration of aqueous solutions of sulfate, sodium iodide and their mixtures without and in the presence of a corrosion inhibitor of the nickel collector – benzotriazole. It was found that the specific capacity of devices based on sodium iodide is almost two times higher than in the case using sulfate media. Close values of specific capacitance were obtained in devices based on mixed electrolytes.

The work is devoted to the study of the electrochemical characteristics of prototype energy storage devices made on the basis of electrodes consisting of titanium-modified graphite woven material “busofit”. It is shown that the modification increases the specific values of the capacitance and the magnitude of the operating voltage.

The electrochemical behavior of Ti electrode in aqueous solutions containing Na₂MoO₄ + H₃PO₄ + chitosan was investigated by methods of potential – time (E–t) curves at cathodic polarisation in galvanostatic mode, currentless chronopotentiometry, optic microscopy, X­ray spectral analysis of surface and determining roughness by measuring the wetting angle.

The power sources of the lithium­-fluorinated carbon electrochemical system often fail to withstand forced discharges because of greater heat emission due to ohmic and polarizing losses, which leads to heating at the best, and to destruction of the element and failure of the equipment at the worst. Heat emission from the cells of the lithium manganese–dioxide system at forced discharges is 2–3 times less than from the similar cells of the lithium–fluorinated carbon system.