Cd|KOH|NiOOH

Zn|NH4CI|MnO2

Li|LiClO4|MnO2

Pb|H2SO4|PbO2

H2|KOH|O2

Alkaline batteries

Influence of the Method of Introducing Cobalt Into the Active Mass of Positive Metal-lock Electrodes of Nickel-Zink-batteries on Their Capacitance Characteristics

It is experimentally established that the use of Ni-Zn batteries as positive oxide-Ni electrodes of metal-cell electrodes on porous polymer bases leads to a significant decrease in their capacity. Reduce zincate poisoning of positive electrodes of this type is possible with the introduction of cobalt hydroxide into the active substance. Various methods of introducing an activating additive into the active mass of the electrode have been studied.

Optimization of the active mass composition of electrophoretic cadmium electrodes

УДК 541.136

DOI: https://doi.org/10.18500/1608-4039-2016-16-2-62-76

The work is devoted to the development of methods for input and current monitoring of the active mass components of electrophoretic cadmium electrodes in order to improve the stability of the discharge characteristics of nickel-cadmium batteries of the NKM series.

The Problems of Low-temperature Lithium-ion Batteries

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.

 

Changes in the discharge characteristics of nickel-cadmium FKM mock-up batteries with nickel-oxide electrodes on a metallized carbon-graphite felt basis during long cycling

Our test results of nickel-cadmium FKM mock-up batteries with metal-felt nickel-oxide electrodes are presented. The discharge characteristics of the tested mock-up batteries with nickel-oxide electrodes made on the carbon-graphite felt basis are shown to exceed virtually all relevant requirements of Russian Railway Industry Standards. The high cyclability of these batteries was established: reduction of the discharge capacity lower than the nominal value was observed after 3100 cycles.

Metallization of electrolitic die of alkaline matrix fuel cell

В работе рассмотрена металлизация электролитной матрицы щелочного матричного топливного элемента, обусловленная растворением платинового катализатора на кислородном электроде этого элемента. Показано, что уровень металлизации зависит от условий функционирования топливного элемента и структурных особенностей его составляющих.

Thermal runaway in nickel-cadmium batteries with sintered and extruded electrodes

It is shown by experiments that probability of thermal runway in nickel-cadmium batteries with sintered oxide-nickel electrodes is higher, than in the batteries with extruded and pasted electrodes. Besides, it is shown that the probability of thermal runaway decreases with decrease of battery capacitance.

Development of the effective ways of the activation of the anodes for water electrolysis

Electrochemical activity of anodes on the basis of a nickel mesh grid for water electrolysis is investigated. Activation of anodes was made by three ways:
1) chemical covering sulfur-containing compounds of nickel and iron;
2) immersing in solution Na2S2O3 + H2SO4 (till pH=3);
3) immersing in solution Na2S + H2SO4 (till pH=3).
The water solution 6M KOH was used as the electrolyte while the electrodes testing. Current density varied in a range from 1 to 600 mAJ cm2 at temperature 20, 50 and 70°C. The greatest electrochemical activity have anodes activated by the third method. The anode potential at current density 600 mA/cm2 and temperature 70°C is equal +0.57 V (concerning Hg/HgO – the comparison electrode).

Electrochemical activity of the cathodes with platinum or platinum-palladium electrocatalysts for alkaline water electrolysis

Electrochemical activity of cathodes with Pt or Pt-Pd-electrocatalysts was studied by voltammetry method under galvanostatic conditions. The dependence of the overvoltage of hydrogen evolution reaction on the logarithm of current density and on the test time of the cathode with Pt-Pd-electrocatalysts are defined. It is shown that the electrochemical activity of cathode with Pt-Pd-electrocatalyst is two times higher than with Pt-electrocatalyst at the hydrogen evolution reaction in 30% KOH solution at 90°C. As the temperature increases from 15 to 90° C the current density at 40 mV overvoltage at the cathode with Pt-Pd-electrocatalyst increases by 8 times. The test results with this cathode electrocatalyst in the laboratory electrolyzer at a current density of 400 mA/cm2 and 65° C temperature within 11 days of intermittent regime work confirm the overvoltage stability in time.

Tests of the sealed nickel-cadmium storage batteries for capacity safety during long-term storage after charging with direct and asymmetric currents

Comparative results of the tests of the sealed nickel-cadmium batteries for capacity safety during long-term storage after charging with direct and asymmetric currents are represented. Charging with asymmetric current was carried out in an accelerated manner at average value of the charging current equal to 0.8Crated. Charging with direct current was carried out at average value of the charging current equal to 0. lCrated in accordance with Technical Conditions. Tests prove that batteries acceleratedly charged with asymmetric current are compliant with technical conditions concerning capacity safety during long-time storage. Tests also prove discharge capacity advantage of batteries charged with asymmetric current after long storage, in comparison with batteries charged with direct current.

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