Battery voltage against temperature.

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martakz's picture
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Joined: Dec 20 2003 - 10:38
Battery voltage against temperature.

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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Last seen: 8 years 8 months ago
Joined: Dec 20 2003 - 10:38
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.

martakz's picture
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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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