Alkaline batteries

Automated rapid charge of the sealed nickel-cadmium storage batteries with asymmetric current, and its influence on the resource

The research results of the sealed nickel-cadmium storage batteries reliability at the rapid charge with asymmetric current are represented. In accordance with the reliability theory postulates, the experimental data of the resource test in the mode of the storage batteries 10NKGZ-1,8-1, 10NKGZ-3,5-l, 10NKGZ-4 cycling. The predicted resource gain in comparison with the direct current charge, while using the device of automated storage batteries charge with asymmetric current is confirmed, as well as decrease in the mode of the heating-up charge, and the fall-off in gas emission intensity.

Influence of Asymmetric Current Parameters on Nickel-Cadmium Accumulators Formation Process Time

Comparison of asymmetric current parameters influence on nickel-cadmium accumulators forming time is performed. According to the results of capacity forming of NKM-22 accumulators with thin pressed cadmium and metal-ceramic electrodes, the perspective of application of asymmetric current with parameters chosen during experiments and used in this paper is established. Waveforms giving the biggest increase of capacity comply with the most economical parameters defined om models during experiments. In particular, application of asymmetric current with such parameters for NKM-22 accumulators forming gave 11% increase of discharge capacity compared with direct current forming.

The experimental study of the process of electrochemical syntheses of nickel hydroxide

Work of running double-chamber electrochemical reactor is investigational for an electrosynthesis Ni(OH)2. It is shown that the basic parameter of the mode is a relative current is attitude of current of I toward the theoretical equivalent current of I*, at that fully initial reagents are expended in a reactor. Mode of I/I* = 1 differentiates two areas (I < I* and I > I*) with salutatory and like changing physical and chemical and electrochemical properties Ni(OH)2.

Research of sealed nickel-cadmium accumu-lators with thin electrodes formation

The results of nickel-cadmium accumulators formation with asymmetric current, in the mode providing long life of the first cycle till the accumulator stress stops to grow, are represented. The possibility of using stress on the accumulator as criterion of charge completion is proved. Research shows efficiency of mode applying chosen criterion – consedirable decrease of charge-discharge cycles of formation while preserving given working characteristics.

YaDevelopment of new electrocatalysts for low temperature electrolysis of water

Optimized methods of synthesis and modification of high efficient electrocatalysts for alkaline electrolysers have been described. The results of new electrocatalyst characterization by means of some physico-chemical methods are presented.

Capacitance from Discharge Current Depen-dence Modeling in Nickel-Cadmium Batteries

It was shown by experiments for SAFT batteries of stationary application and medium rate of discharge, that empirical equations Korovin-Skundin's, Peukert's generalized equation, probability integral, porous electrode equation allow to describe the dependence capacitance C(f), given by nickel-cadmium batteries, from discharge current with the accuracy sufficient for practical needs (5-6%) on all the range of discharge currents. Meanwhile the empirical equations of Peukert and Aguf can be used to calculate the capacitance given away only within the discharge currents, starting from the point of inflexion of experimental curve C(i) infinitely. Libenov equation, which can be used only within the range of discharge currents from the point of inflexion of experimental curve C(i) and up to the discharge currents, wherein С(i) ≈ 0.05Cn, is of even bigger specialty.

Comparative Research of Asymmetric Current Parameters Influ-Ence on Accumulators Formation Process

Comparison of influence of asymmetric current parameters on nickel-cadmium accumulators formation process time is carried out. According to the results of capacity formation of accumulators types NKPLHC-0,5 with thin extruded electrodes, we established good perspective for application of asymmetric current with parameters chosen during experiments and applied in this paper. Current waveform which gave the biggest capacity increase, has long charging impulse and short, with wide range, discharge impulse. In particular, application of asymmetric current with such parameters in the process of NKPLHC-0,5 accumulators formation resulted in increase of discharge capacity, compared with formation by direct current, by 16%.

Investigation of the Causes of Thermal Run-away in Sealed Nickel-Cadmium Batteries

It is shown from analysis of charging current and voltage change on the terminals of sealed Ni-Cd battery at thermal runaway, that thermal runaway is accompanied by a new high-power electrochemical reaction, going at battery voltage of approximately 0.55 V.

Porous Strukturen and Electrochemical Characteristics of Nickel-Oxide Electrodes Based on Metallized Carbon Graphite Felt Matrix

A study of the porous structure and discharge characteristics of electrochemically impregnated nickel oxide electrodes based on nickel- ized graphitized felt«Voilocarb-22» is conducted. It is shown that the developed technology of nickel oxide electrodes fabrication that involves such operations as nickel plating of the substrate, electrochemical impregnation, electrode formation and pressing allows forming polydisperse structured electrode active material with pore sizes ranging from 0.01 pm to 100 pm. The electrochemical tests have shown that the mockup batteries with newly-developed nickel oxide electrodes based on nickelized carbon/graphite felt have surpassed all requirements of the international standard IEC 62259:2007.

Influence of additive in electrolytic production of zinc electrode on its electrical characteristics

We have studied the influence of brighteners used in zinc electroplating on the characteristics of zinc powder, which produced in the manufacture of electrolytic zinc electrode. Their effect was determine on the cathodic process, the nature of spongy zinc deposits, corrosion of the zinc electrode and capacity characteristics with intense discharge in a nickel-zinc accumulator.