-

Low-temperature test was held to determine the discharge characteristics of battery cells with the purpose to specify the requirements to electrode materials and electrolyte used in cylindrical nickel metal hydride battery cells of AA standard size that fit for work at negative temperatures.

Two materials based on V₂O₅ and PANI were compared in their behaviour in positive electrodes of lithium (lithium-ion) rechargeable batteries. Composite material consisted from mixture of nanostructured individual components whereas PANI was intercalated into interlayer space of V₂O₅ in the hybrid material. Both materials are shown to be able to reversibly insert lithium ions, initial capacity being almost the same (220–250 mA·h/g). Cycling stability of hybrid material was notable better than that of composite one.

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.

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.

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.

Samples having the chemical formula Li_0.5 Fe_{2.5 – x} Mg_xO₄ (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.

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.

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.

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%).

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.