Explain construction and working of Ni- Cd cell with diagram.
Construction:
i) Positive plates are made up of nickel plated tubes, containing a mixture of nickel oxide (NiO2) & hydroxide + 17% flakes of graphite or metallic nickel for increasing conductivity.
ii)They also contain an activated additive 2% Ba(OH)2 which increases the life of plates.
iii) Negative plates consist of spongy Cadmium.
iv) The electrolyte is 20- 15% solution of KOH to which small quantity of lithium hydroxide (LiOH) is added to increase the capacity of cell.