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**ligaliaCods** · 08-30-2012, 06:22 PM

Just to add to the excellent wiki information, the three sets of components in the electrochemical cells for the battery are Lead (s) (metal), lead (II) sulfate and lead (IV) sulfate.

I am not at my usual place, so do not have my SI Chem Data ready at hand to give solution equilibrium constants. These numbers give indication as to the solubility of the lead salts (lead(II)sulfate and lead(IV)sulfate)

Keeping your battery bottom warm (or not freezing is the best way to not have the mainly lead(IV) sulfate precipitate (the crystallising salts in the Wiki). It is this that is the very very difficult thing to get back into solution and it causes the lead metal to be decayed off the metal electrode.

I am careful of experimenting with the conditions to regenerate a "dead" battery, but would think warming to 50 or 60C may assist in the solubility of lead sulfate salts (of lead(II) and lead(IV) types). Over voltage recharging may assist in the redepositioning of the reduced lead metal back onto the plate electrode, but you will be running a very high chance of a hydrogen gas build up. You will need to monitor the fluid levels as the excess heat and electrolysis of the water will; work to evaporate and lower the fluid level.

The use of the lead acid battery as an example for half cells and electrochemistry is very neat as people sort often get to see these regularly in life.

08-30-2012, 06:22 PM	#19
ligaliaCods Join Date Oct 2005 Posts 349 Senior Member	Just to add to the excellent wiki information, the three sets of components in the electrochemical cells for the battery are Lead (s) (metal), lead (II) sulfate and lead (IV) sulfate. I am not at my usual place, so do not have my SI Chem Data ready at hand to give solution equilibrium constants. These numbers give indication as to the solubility of the lead salts (lead(II)sulfate and lead(IV)sulfate) Keeping your battery bottom warm (or not freezing is the best way to not have the mainly lead(IV) sulfate precipitate (the crystallising salts in the Wiki). It is this that is the very very difficult thing to get back into solution and it causes the lead metal to be decayed off the metal electrode. I am careful of experimenting with the conditions to regenerate a "dead" battery, but would think warming to 50 or 60C may assist in the solubility of lead sulfate salts (of lead(II) and lead(IV) types). Over voltage recharging may assist in the redepositioning of the reduced lead metal back onto the plate electrode, but you will be running a very high chance of a hydrogen gas build up. You will need to monitor the fluid levels as the excess heat and electrolysis of the water will; work to evaporate and lower the fluid level. The use of the lead acid battery as an example for half cells and electrochemistry is very neat as people sort often get to see these regularly in life.
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