Battery voltage against temperature.

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martakz's picture
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Joined: Dec 20 2003
Posts: 634

Hi All,

For a chemistry report I am comparing the chemistys of different battery brands. Anyway, one of the tests I did was to plot the battery voltage Vs cell temperature.

From my knowledge of chemistry and half cells, I know that as temperature increase cell voltage should go up. This is because high temperatures promote more ion movement etc and generally speed up reactions. (If they are endothermic)

Anyway, I plotted my results and got the following graph:

Any idea why?

This was done with a standard AA 1.5V cell.

Cheers,

T

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Joined: Dec 20 2003
Posts: 851
Because as temperature goes u

Because as temperature goes up, internal resistance also goes up. But it doesn't go up at the same rate as brownian motion.

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Dr. Bob
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martakz's picture
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Joined: Dec 20 2003
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Oops, didn't see your comment

Oops, didn't see your comment Dr Bob. Thanks Smile

Btw, if you want to read the completed assignment just message. I'm pritty sure you won't want to though as its pritty dull.

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Now using x86 machines. Bye bye iMac266 (Strawberry), G3 1400 and the G3 IIsi.