lead acid acc

• During discharge both electrodes build up a layer of

  PbSO4
• anode?

  spongy Pb
• cathode?

  PbO2
• electrolye?

  dilute h2so4
• anode rxn?

  Pb + SO42- -> PbSO4 + 2e
• cathode rxn?

  PbO2 + 4H+ + SO42- + 2e = PbSO4 + 2H2O
• how many lead acid acc in a car?

  6 connected in series
• advantage?

  High power to weight ratio

  High surge current

  Relatively low cost
• Disadvantages?

  Low energy to weight ratio

  Low energy to volume ratio

  High weight