by on April 30, 2020
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Secondary cells – Accumulator

There are two main kinds of secondary cells

1.  The Lead-Acid Accumulator

2. The Alkaline or Nife Accumulator

  1. The lead-acid accumulator

The lead acid accumulator consist of a leadoxide  as the positive electrodes Anode and lead as the negative electrode, cathode. The electrolyte is tetraoxosulphate VI Acid

 

  1. The alkaline or Nife accumulator.. this is made of Ni and Fe  electrodes where the name comes from . Ni and Fe are the chemical symbol of Nickel and Iron

The positive electrodes , Anode is the Nickel hydroxide while the negative electrodes ,cathode is the Iron or cadmium . the electrolyte is the solution of potassium hydroxide.

They last longer than lead acid accumulator and mostly used in hospital and factories.

 

Charging and discharging of accumulator

Diagram

 

During discharging of lead-acid accumulator, when the cell is given out current in form of  energy, both electrodes gradually change to lead tetraoxosulphate VI  WHILE THE Acid becomes diluted and the density decrease

During charging electrolysis takes place , the lead tetraoxosulphate VI DISSOLVES AND the lead migrates to the eectrodes while more tetraoxosulphate VI Acids is produced. The density of the electrolytes becomes normal and the voltage level is restored.

Example of lead acid accumulator is car battery.

ELECTRIC CELLS,  DEFECTS OF A PRIMARY CELLS, POLARIZATION AND LOCAL ACTION

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