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Anonymous Poster #1

I Have a Battery Question

03/22/2013 7:57 AM

Hello Engineers,

I want to know wich type of Acid used in Batteries ? In oldendays using only lead acid batterics. But now-a-days using same acid or better than lead acid ?
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Anonymous Poster #2
#1

Re: I HAVE DOUBT IN BATTERIES

03/22/2013 8:10 AM

http://en.wikipedia.org/wiki/Secondary_battery

http://en.wikipedia.org/wiki/Lead%E2%80%93acid_battery
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SolarEagle
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#2

Re: I HAVE DOUBT IN BATTERIES

03/22/2013 8:15 AM

Sulfuric acid is used in lead acid batteries, it has not changed for about 100 years afaik....and, I might add, not likely to change anytime soon....

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PWSlack
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#3

Re: I HAVE DOUBT IN BATTERIES

03/22/2013 8:20 AM

...because each cell is based on a lead electrode and an electrode coated with lead sulphate. Sulphuric acid is the only stuff that can do it while achieving 2.06V/cell.

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energyconversion
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#4
In reply to #3

Re: I HAVE DOUBT IN BATTERIES

03/22/2013 1:03 PM

May I point out that the cathode is coated with lead dioxide when charged. This is the "fuel" (oxidant) for the reaction. The anode is bare lead when charged. This is the reductant. The overall reaction is:

Pb(s) + PbO2(s) + 2H2SO4(aq) → 2PbSO4(s) + 2H2O(l)

Which can be reduced into even simpler terms:

Pb + Pb02 + 4H+ → 2Pb++ + 2H2O

In other words, the lead anode (+0 state) gets oxidised to Pb++ while the lead dioxide (+4 state) coated cathode is reduced to Pb++. This is an example of "disproportionation" - a clumsy word that describes an element in 2 different oxidation states, undergoing oxidation and reduction at the same time, both landing up in the same oxidation state. Essentially, 2 electrons are transferred from anode to cathode via the external circuit with an emf of 2.06 volts.
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PWSlack
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#5
In reply to #4

Re: I HAVE DOUBT IN BATTERIES

03/22/2013 2:43 PM

Well done.

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energyconversion
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#6
In reply to #5

Re: I HAVE DOUBT IN BATTERIES

03/22/2013 10:04 PM

Oops, actually, I am in error - slightly. The result of a disproportionation reaction does not have to be products in the same oxidation state, although they are in the Pb/PbO2 reaction.
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Byron Jay
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#7

Re: I Have a Battery Question

03/23/2013 9:25 AM

Watch this video and you will understand how the lead acid battery works. Then you will know more than most. http://www.youtube.com/watch?v=4IgHj2Uim_0

As far as I know there is no book called batteries for dummies.

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