Cd|KOH|NiOOH

Zn|NH4CI|MnO2

Li|LiClO4|MnO2

Pb|H2SO4|PbO2

H2|KOH|O2

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.

Studying of the physicochemical properties of various samples of antimony (III) oxide and their influence on the electrochemical characteristics of cadmium electrodes:

–effect of the antimony (III) oxide solubility in water;

–influence of preliminary ultrasonic treatment of antimony (III) oxide and its suspension on the antimony (III) oxide solubility;

–studying of the hydration degree of cadmium oxide in the electrodes with various ratios of nickel (II) hydroxide and antimony (III) oxide;

–discharging characteristics of electrophoretic cadmium electrodes with various ratios of technological additives on the forming cycles.

It is shown that preliminary ultrasonic treatment of the aqueous suspension of antimony (III) oxide allows increasing the antimony concentration in the aqueous extract and obtaining an active mass with a lower hydration degree of cadmium oxide (14–30%), which is practically independent of the amount of technological additives.

It has been established that the chargeability of cadmium electrodes, their discharge capacitance, the discharge characteristics stability and the specific surface area are mainly affected by the activity of the introduced activating additives (nickel (II) hydroxide) rather than by the hydration degree of cadmium oxide.

Literature

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2. Kazarinov I. A., Kadnikova N. V., L’vova L. A. Vlijanie uslovij gidratacii okisi kadmija na elektricheskie svojstva kadmievyh elektrodov [Influence of the cadmium oxide hydration conditions on the electric properties of cadmium electrodes]. Zhurnal prikladnoj chimii [Russian J. Appl. Chem.], 1978, vol. 51, no. 9, pp. 1950–1954 (in Russian).

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4. Kadnikova N. V., L’vova L. A., Grachev D. K. Ovchinnikova N, P. Izuchenie adsorbcionnogo vzaimodejstvija oksida kadmija s sur’moj (III) v shelochnyh rastvorah [Study of the adsorption interaction of cadmium oxide with antimony (III) in alkaline solutions] Zhurnal fizicheskoj himii [Russian J. Phys. Chem.], 1984, vol. 58, no. 6, pp. 1446–1449 (in Russian).

5. Kadnikova N. V. Mehanizm vzaimodejstvija v sisteme oksid kadmija – oksid sur’my (III) – koncentrirovannyj rastvor shjelochi. Avtoref. dis. kand. him. nauk. [Interaction mechanism in the system: cadmium oxide – antimony (III) oxide – concentrated alkali solution. Phd. aftoref. diss.] – Saratov, 1984. 17 p. (in Russian).

6. L’vova L. A., Grachev D. K., Ob’edkov Yu. I., Kazarinov I. A. Gal’vanostaticheskie izmerenijapri anodnom okislenii kadmievogo elektroda v rastvorah KOH [Galvanostatic measurements while anodic oxidation of the cadmium electrode in KOH solution]. Electrochimiya [Russian J. Electrochemistry], 1974, vol. 10, no. 8, pp. 964–967 (in Russian).

7. Ob’edkov Yu. I., L’vova L. A. Izuchenie katodnogo processa v sisteme Cd/Cd(OH)2/KO H. I [Study of the cathode process in the Cd/Cd(OH)2/KOH system. I]. Electrochimiya [Russian J. Electrochemistry], 1973, vol. 9, no. 11, pp. 1649–1652 (in Russian).

8. Ob’edkov Yu. I., L’vova L. A. Izuchenie katodnogo processa v sisteme Cd/Cd(OH)2/KO H. II [Study of the cathode process in the Cd/Cd(OH)2/KOH system. II]. Electrochimiya [Russian J. Electrochemistry], 1974, vol. 10, no. 3, pp. 359–362 (in Russian).

9. Kazarinov I. A., Kadnikova N. V., L’vova L. A. Vlijanie fiziko-himicheskih svojstv gidoksida kadmija na ego elektrohimicheskoe povedenie [Influence of the physicochemical properties of cadmium hydroxide on its electrochemical behavior]. Electrochimiya [Russian J. Electrochemistry], 1980, vol. 16, no. 6, pp. 809–813 (in Russian).

10. Kazarinov I. A., L’vova L. A., Ivanova I. L. Izuchenie kinetiki katodnogo vosstanovlenija gidroksokadmatnyh kompleksov metodom vrashajushegosja diskovogo elektroda [Study of the kinetics of cathodic reduction of hydroxo-cadmate complexes in alkaline solutions by the rotating disk electrode method]. Electrochimiya [Russian J. Electrochemistry], 1982, vol. 18, no. 7, pp. 895–898 (in Russian).

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