Литиевые электрохимические системы

Multichannel instrument to study batteries and electrochemical cells during charge-discharge cycling, and open-circuit conditions is described. Each channel is a programmable potentiostat-galvanostat operating by an independent program. The accuracy of the stabilization current and potential is 0.01%. The additional sensors with analog output, such as temperature, can be plugged to each channel. The proposed hardware and software solution allows to control experiments, receive measurement data and remote administer the instrument via Ethernet.

In this study, the electrochemical behavior and properties of the novel LiFePO4-based composite cathode material with a water-soluble binder LA-133 and a conductive polymer PEDOT:PSS (poly-3,4-ethylenedioxythiophene: polystyrenesulfonate) as an aqueous dispersion were studied. Using the conductive polymer in combination with a water-soluble binder LA-133 allows to reduce the proportion of electrochemically inactive components (up to 10\%) and thus to increase its specific capacity for a given weight of the active material.

The relationship between the structural parameters of layered materials such as \alpha -NaFeO2 used as positive electrode materials of lithium-ion battery, and electrochemical characteristics were investigated. The dependence of charge transfer resistance on the ratio of cobalt to lithium mole fractions in layered oxides was studied.

It is shown that the performance of lithium-ion battery is significantly affected by the component structure of the electrodes, electrode fabrication technology, forming the battery mode. It is shown that in the production of lithium-ion batteries can be used the following materials: as a binder – polymer dispersion of water-based СНР 500, the negative electrode material – synthetic graphite 131181008–1 brands and 20130905.

Produced a new lithium power sources based on an electrochemical system Li/Ag₂O with a solid polymer electrolyte, investigated his discharge characteristics.

DOI: 10.18500/1608-4039-2015-15-4-167-174

To model the characteristics of lithium-sulfur batteries based on the experimental evaluation of the electrochemical properties of electrode materials, the software "Battery Designer", included in the software package “ElChemLab”, was developed. The possibilities of software are described. The specific energy of lithium-sulfur batteries is compared for different surface capacitances of a positive electrode and for different amounts of electrolyte.

УДК 544.65+621.355.9

DOI:  https://doi.org/10.18500/1608-4039-2016-16-1-30-33

Electrochemical stability of aluminum in 0.5М NaPF6 solutions in mixtures of ethylene carbonate – dimethylcarbonate – propylene carbonate and ethylene carbonate – dimethylcarbonate – diethylcarbonate has been studied with cycling voltammetry. The reality of aluminum using as current-collector in negative electrode of sodium-ion batteries is declared.

УДК 544.6; 621.355

DOI:  https://doi.org/10.18500/1608-4039-2016-16-3-122-150

DOI: https://doi.org/10.18500/1608-4039-2017-17-2-61-88

The critical analysis of literature of last 15 years, concerning features of low-temperature behavior of lithium-ion batteries is presented. Some generalized approaches to the problem as well as the role of main polarization components at low temperatures; features of functioning of negative and positive electrodes are reviewed. Some low-temperature electrolytes are reviewed as well.