Lead Storage Battery

A typical 12-V lead-acid battery has six cells connected in series , each of which delivers about 2 V. Each cell contains two lead grid packed with the electrode material: the anode is spongy Pb and the cathode is powered PbO₂ . The grids in immersed in an electrolyte solution of 4.5 M H₂SO₄ . A fiberglass sheet between the grids prevents shorting by accidental physical contact. When cell discharges, it generates electrical energy as voltaic cell.

Half reactions:

Anode: Pb(s) + SO₄^-2  --------------->   PbSO₄ (s) +2é   E^o= 0,356 V

Cathode (Hg):  PbO₂ (s) + SO₄^-2   + 4H⁺ +2é       ------>       PbSO₄ + 2H₂O      E^o= 1,685 V

Net: PbO₂ (s) + Pb(s) + 2H₂SO₄  ------------->  PbSO₄ (s) + 2H₂O  E^o_cell= 2.0 V

Prof. Dr. A. Sezai Saraç’ın notlarından alınmıştır.
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