ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

Литиевые электрохимические системы

The reseiption of composite protective coat for aluminium and their alloys by reversal galvanostatic method

This message was transferred with a trial version of CommuniGate(r) Pro* First pilot samples of composite sheetings based on various metallic matrixes (Al, Cr, Mn, Fe, Ni) and ceramic fillers ((Al2O3, Cr2O3, MnO2, Fe3O4, NiO, AlN etc.) were obtained by means of the reverse galvanostatic technique.

Calculation of capacity given by sealed nickel-cadmium accumulators at different discharging currents

It is has been shown that the generalized Peukert equation gives the best result when calculating the capacity given by sealed nickel-cadmium accumulators at different discharging currents.

Development of technological principles for designing a valve-regulated Ni-MH battery of the NMG type

The results of the design of a fully-tight Ni-MH battery of the NMG type are presented. The authors have developed a spread technique of making both negative and positive electrodes with sheet foam nickel as a conducting support. The influence of the density of both charging and discharging current and the discharge temperature on the discharging characteristics of the power source was studied.

Electrophysical properties of non-stoichiometric lithium-iron magnesium-substituted spinels

Samples having the chemical formula Li0.5 Fe2.5 – x MgxO4 (0 ? x ? 1) were prepared by the standard ceramic method. The parts of the dielectric constant ?', ?'' and A.C. conductivity ?(?) are measured at different frequencies from 10 – 2 to 105 Hz in the room temperature and different cooling velocity, and then the dielectric loss tangent tg ? was calculated. The sample with x = 0.1 what was cooled quickly showed the greatest values of ?0 as compared with the other samples.

Lithium rechargeable work in the systems with polymer electrolytes based on C-PVC and PVDE

Electrochemical behavior of Li in the systems with PE based on polymers of chlorinated polyvinylchloride and polyvinylidene fluoride were investigated by the method of cyclic voltammetry and galvanostatic cycling. Potentiodynamic investigations have shown that on lithium electrode even in the systems with polymer electrolyte the high current densities up to 5 mA/cm2 are realized. Influence of polymer electrolyte composition on the properties of the interface Li/electrolyte and rechargeable work of lithium electrode has been shown.

Catalytic composition and fuel influence on anodic processes characteristics of solid polymer electrolyte fuel cells

It was studied an influence of prior carbon treatment (temperature and gas conditions, mass content of waterproofing agent) on activity of platinum catalyst, synthesized on disperse carbon carrier. It was shown that characteristics of anodic processes depend on quantity of solid polymer electrolyte in catalytic composition. Optimal content of ion exchange polymer under varied degree of carbon carrier waterproofing (used for synthesis of platinum catalyst) is not equal.

Self-discharge dynamics and accelerated test approach for state-of-charge forecast for lithium cells BR2325

There were investigated the self-discharge dynamics in two homogeneous groups («A» and «B») of the coin lithium cells ВR2325 on the basis of superstoichiometric fluorocarbon CF1.20, selected from the uniform experimental batch of 10000 pieces. The reason of two different groups («A» and «B») appearance through 3–6 months of storage is connected with the origin of hydrogen fluoride in cathodes of group «A» cells, which will be derivated at auto catalytic hydrolysis of C-F-bonds by a moisture tracers (0.1–0.5%).

Iron disulfide is promising positive electrode material for lithium power battery

Comparative characteristic of natural and synthesized iron disulfide has been carried out. Physical, chemical and macrostructure characteristics of pyrite powders have been shown. By the methods of cyclic Vtammetry the electrochemical properties of FeS2 – based cathodes have been investigated in non-aqueous liquid (1М LiClO4; PC+DME) and polymer (CPVC; 1М LiClO4; PC) electrolytes.

Some trends in improvement of cathode materials for lithium-ionic batteries

Major trends in cathode active material development for lithium-ion batteries have been reviewed. Statistics on all publications in «Journal of Power Sources» (from 03.2006 till 04.2007) is summarized in order to point out that the main effort in secondary batteries development is concentrated on lithium-ion batteries, especially on positive electrode study. Based on these publications the main routes for LiCoO2 modification as well as for novel materials research have been reviewed.

Electrodes of lithium-ion batteries: some simple method for diagnostics of degradation at cycling

It is shown that an examination of reduced galvanostatic charge-discharge curves allows making preliminary conclusion on degradation mechanism upon cycling. If such degradation is due to loss of active material all normalized curves coincide. In the case of insulating films building up normalized curves are shifted along potential axis. Various structure changes result in qualitative change of curves shape.