Effect of Lithium Ion on the Formation of Active Material from Nickel Plaque at Various Temperatures

Abstract

The effect of lithium ion on the formation of active material from nickel plaque have heen studied at various temperatures by means of the current-potential curves obtained with polarized nickel electrode in alkaline solution and the electromicrophotograph of the surface of nickel electrode.
The results are summerized as follows.
( 1 ) As the temperature increases, the amount of active material formed from nickel plaque increases, but the formation of nickel-lithium compound becomes more rapid. Therefore, the oxidation of nickel plaque is disturbed at higher temperatures.
( 2 ) The increase in activity of OH- in LiOH with temperature is smaller than that in KOH.
( 3 ) The active material produced by repeated oxidation-reduction cycles reacts with lithium ion, resulting in shedding.
Because of such phenomenon, the over charge-discharge is not desirable when lithium ion is added to electrolyte solution.