Kotok V. The rapid impulse discharge method for Ni(OH)2 estimating as alkaline accumulators electrode material

Transport and electrochemical processes are in an oxide-nickel electrode. Development of method of comparative nickel oxyhydroxide (NiООН) activity comparison in the production of alkaline accumulators. Methods: galvanostatic, rapid impulse discharge, cyclic voltammetry, EDTA and acid-basic titration, electronic microscopy, X-ray analysis, mathematical design. The rapid impulse discharge method is developed for criterion determination of electrode materials quality estimation with solid-state reagents and his values are certain for powders of Ni(OH)2, which were synthesized by different methods. It is founded intercommunication between main physical and chemical properties - specific surface area, proton diffusion coefficient, volume current density, discharge time and the estimation criterion of active material quality is product of proton diffusion coefficient on the specific surface square (D·S2), which characterizes the capacity of alkaline accumulators electrode under discharge by large currents with the high utility coefficients. It is proved that the transfer of protons in NIOOH is carried out parallel the mechanisms of diffusion and migration. It is shown that due to introduction of the additional stage of electron transfer between the ions of nickel in a crystalline grate, possibility of deep crystal discharge in a volume and absence of blocking of electronic contacts is explained. The method of rapid impulse discharge can be utilized for the evaluation of activity of other solid-state power sources reagents, which work by intercalation mechanism. A sphere of the use is accumulator industry.