Secondary (Rechargeable) Batteries
Chemistry of Batteries
Lead-Acid Batteries
Anode (oxidation):
Pb(s) + SO42-(aq) PbSO4 (s) + 2 e-
Cathode (reduction):
PbO2 (s) + 4 H+(aq) + SO42-(aq) + 2 e- PbSO4 (s) + 2 H2O(l)
Overall (cell) reaction (discharge):
PbO2 (s) + Pb(s) + 2 H2SO4 (aq) 2 PbSO4 (s) + 2 H2O(l); Ecell = 2 V
Overall cell) reaction (recharge):
2 PbSO4 (s) + 2 H2O(l) PbO2 (s) + Pb(s) + 2 H2SO4 (aq)
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