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.
Anode: Pb(s) + SO4-2 ---------------> PbSO4 (s) +2é Eo= 0,356 V
Cathode (Hg): PbO2 (s) + SO4-2 + 4H+ +2é ------> PbSO4 + 2H2O Eo= 1,685 V
Net: PbO2 (s) + Pb(s) + 2H2SO4 -------------> PbSO4 (s) + 2H2O Eocell= 2.0 V
Prof. Dr. A. Sezai Saraç’ın notlarından alınmıştır.
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