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Lead acid battery Charge Chemistry

- May 29, 2018 -

Lead acid battery Charge Chemistry


This type of battery can be recharged. In the charged state, each cell contains negative plates of elemental lead (Pb) and positive plates of lead(IV) oxide (PbO2) in an electrolyte of approximately 4.2 M sulfuric acid (H2SO4). The charging process is driven by the forcible removal of electrons from the positive plate and the forcible introduction of them to the negative plate by the charging source.


Negative plate reaction: PbSO4(s) + H+(aq) + 2e– → Pb(s) + HSO4–(aq)


Positive plate reaction: PbSO4(s) + 2H2O(l) → PbO2(s) + HSO4–(aq) + 3H+(aq) + 2e–


Combining these two reactions, the overall reaction is the reverse of the discharge reaction:


2PbSO4(s) + 2H2O(l) → Pb(s) + PbO2(s) + 2H+(aq) + 2HSO4–(aq)


Notice how the charging reaction is the exact opposite of the discharge reaction.


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