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Thin film materials LiCoO₂, LiCoNi_xO₂, LiCoBi_xO₂, LiCoFe_xO₂ was prepared by extraction-pyralytic technique. Their properties were studied by DTA, electron microscopy, X-ray diffraction, Atomic absorption spectroscopy, IR-spectroscopy an cyclic time-voltage measurements. We established that receiving materials have well electrochemical characteristics. Extraction-pyralytic technique can be recommended as a perspective technique for thin film lithium batteries production.

It is shown that at small discharging currents for any nickel-cadmium (NC) accumulator the empirical relationship by Khaskina- Danilenko is true and at large discharging currents the relationship by Shepherd is correct. These two relationships don't contradict each other but supplement each other, as they are true for any NC accumulator, each in its interval of discharging currents.

It has been established experimentally that during the heat acceleration a great amount of hydrogen is given off from nickel-cadmium accumulators.

Effect of positive electrodes composition of lithium-sulfur cells on them cycling life was studied. It is shown that the sulfur content in electrodes does not essential influence on the charge-discharge performance, decrease of capacity during cycling life and cycling efficiency of sulfur electrodes, but strongly influences on the internal resistance of lithium- sulfur cells.

At present LiCoO₂ is commercially available material for positive electrodes of lithium-ion batteries. For further improvement of its properties a number of doped samples of lithium cobaltite were synthesized. Mg and Ti were used as dopants. Crystal structure of LiCo_{1 – x – y}Mg_xTi_yO₂ was studied with XRD, whereas chemical composition was determined with atomic absorption spectroscopy, complexometric titration as well as inductively-bonded plasma. The average initial discharge capacity amounted to 145 to 150 mA·h/g.

Хроника

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.