Write short note on lead storage battery.

Explanation

Lead - acid storage battery. It is the most frequently used battery in automobiles. As the voltage of individual cell in only 2 V, therefore 3 or 6 such cells are joined in series to get a 6V or 12V battery. The cell anode generally conists of a number of plates joined in parallel. each plate is grid of lead filled with finely divided spongy lead. similar, cathode also consist of an equal number of plates connected in parallel. Each plate in this case is a grid of lead packed with lead dioxide `(PbO_(2))`.

These plates are arranged alternatively, separatedly by thin perforated plastic or fibre glass sheets. the whole arrangement is suspended in dilute `H_(2)SO_(4)` (38% by mass and density 1.3 g `cm^(-3)`) taken in plastic or hard rubber vessel. in this case dil. `H_(2)SO_(4)` acts as electrolyte.