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Explain the working of nickel cadmium cells with its merits and demerits over lead acid cell

Explain the working of nickel cadmium cells with its merits and demerits over lead acid cell

Answers

gregory
Nickel- Cadmium cells: In a Nickel-Cadmium cell the positive plates are made
of nickel hydroxide enclosed in finely perforated steel tubes or pockets, the electrical
resistance being reduced by the addition of flakes of pure nickel or graphite. These
tubes or pockets are assembled in nickelled-steel plates. The active material in this
cell is Cadmium mixed with a little iron, the latter being used to prevent caking of the
active material and hence an impairment to porosity.
The electrolyte is a solution of potassium hydroxide (KOH) having a relative density
of about 1.15 to 1.20 depending upon the type of cell and the condition of service.
The electrolyte does not undergo any chemical change; hence the quantity of
electrolyte can be reduced to the minimum value necessitated by adequate clearance
between the plates. The plates are separated by insulating rods and assembled in
sheet-steel containers, the latter being mounted in non-metallic crates so as to insulate
the cells from one another.
gregorymasila answered the question on February 20, 2018 at 16:10

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