Working Air Battery

[stephenafreter]

I like the concept of making our own batteries, thanks guys for sharing all the info !

I was happy to find that Carbon Fiber Tube for model helicopters works well with magnesium ribbon.
Of course I don't have load, but the voltage is good compare to other carbon products I tried.
Bought 20 Euros from ebay (2 rods length 800mm), arrived from Honk Kong in a few days.
Advantage is that it's very strong and hard. It doesn't break.
Carbon Fiber. 2 X 800mm Dia. 12mm Carbon Fiber Tubes from http://myworld.ebay.fr/bigdotunclercstore/

I know it's no more an air battery, but a salt battery, but power is higher when soaked !

[Hugo Chavez]

Carbon fiber works for this?

[stephenafreter]

A last post this evening.
I had the idea to use carbon powder glued on a tape. The powder comes from scratching the Carbon Fiber Tube.
Then a layer of soaked towel paper.
Then an aluminum foil.
This could be rolled to form dense batteries ...
Batteries could be very cheap and made by unskilled persons. Using carbon powder uses very little material, as using foil and tape 

Of course large magnesium ribbon/foil would be better. I don't know where to find some ?!
This picture is just to give an idea of the concept. Next week I will buy some more stuff to build one. Sunday all shops closed here.

[DrZoidberg]

A last post this evening.
I had the idea to use carbon powder glued on a tape. The powder comes from scratching the Carbon Fiber Tube.

That's a great idea. Did you also try manganese dioxide instead of graphite? I wonder what kind of voltage and current that would produce.

[DeepCut]

Laser thanks for the videos

Am i right in thinking it's a replication of these chaps :

http://www.telegraph.co.uk/science/science-news/5353809/Worlds-first-battery-fuelled-by-air.html

And your Magnesium is replacing their Lithium ?

Apparently they have had problems with falling capacity as the battery is cycled.

More details here :

http://research-repository.st-andrews.ac.uk/handle/10023/897


Gary.