Storing Cookies (See : http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm ) help us to bring you our services at overunity.com . If you use this website and our services you declare yourself okay with using cookies .More Infos here:
https://overunity.com/5553/privacy-policy/
If you do not agree with storing cookies, please LEAVE this website now. From the 25th of May 2018, every existing user has to accept the GDPR agreement at first login. If a user is unwilling to accept the GDPR, he should email us and request to erase his account. Many thanks for your understanding

User Menu

Custom Search

Author Topic: Working Air Battery  (Read 221324 times)

Mk1

  • Hero Member
  • *****
  • Posts: 2068
Re: Working Air Battery
« Reply #135 on: July 01, 2010, 12:23:55 PM »
@all

I have uploaded a study made on aluminum battery simple construction and clear detail .

to get access to the download

http://www.overunity.com/index.php?action=downloads;sa=view;down=396

Enjoy !

guruji

  • Sr. Member
  • ****
  • Posts: 470
    • http://andyborg.tripod.com
Re: Working Air Battery
« Reply #136 on: July 01, 2010, 01:10:53 PM »
Mk1 interesting research regards. Today I made a small battery with copper wire around an aluminium in bleach and water gave about 0.3v and 5ma and a copper rod in an aluminium pipe that gave 0.6v at 2ma. Interesting when using copper wire gives more amperage.

stephenafreter

  • Jr. Member
  • **
  • Posts: 54
Re: Working Air Battery
« Reply #137 on: July 01, 2010, 01:42:08 PM »
@Mk1
Thanks a lot for your document  :o
That gives me a lot of useful data !

So adding a bit of NaOH with the salt is very useful for power output. That's good.

1- Did you add graphite powder to the pencils ? If yes, can you explain how ? What "glue" did you use ? 220mA at almost 2V is enormous compared to my 10mA at 0.6V without NaOH  ;D

2- Can you give a shortcut in quantity to prepare the electrolyte, like giving measure in spoon/liter instead of Moles please ?
Congratulations, and thanks for sharing, an essential document !

conradelektro

  • Hero Member
  • *****
  • Posts: 1842
Re: Working Air Battery
« Reply #138 on: July 01, 2010, 07:56:08 PM »

Replication of Pete's (PeteIdl4) aluminium - copper wire cell:

See Pete's tutorial videos (and my photos below):
Part 1 http://www.youtube.com/watch?v=B9YqFY-Z0dk (video by PeteIdl4)
Part 2 http://www.youtube.com/watch?v=ZeQof7ue9xA (video by PeteIdl4)

- Kitchen paper towel sheets were soaked in saturated salt water and then dried in the sun. They were a bit stiff after that but that helped when rapping the paper over the inner aluminium sheet and over the copper wire windings.

- When winding the wire over the (paper covered) inner aluminum sheet I took care that the windings did not touch.

- The outer aluminium sheet and the inner aluminium sheet are held together by a little screw which also holds the cable to the aluminum.

- Air can enter the cells from three sides.

- Four cells are connected in series to get about 2 Volt (without load)

- After the cells were finished they showed about 0.5 Volt, but almost no current. So I added a little water with a pipette. Just enough to make the paper damp. After that I am getting great results (almost for three hours till now):


0.5 Volt without load

0.4 Volt with 1 mA load

0.2 Volt with 4 mA load

short circuit current is about 6 mA



I will report in the coming days how the four cells are holding out. They are driving a Joule Thief which draws about 1 mA (while the four cells in series hold 1.6 Volt steady).


@ Mk1 - Thank you for the aluminum cell PDF-document!


Greetings, Conrad

conradelektro

  • Hero Member
  • *****
  • Posts: 1842
Re: Working Air Battery
« Reply #139 on: July 04, 2010, 03:42:55 PM »
Update on the replication of Pete's (PeteIdl4) aluminium - copper wire cell:

Four cells in series are driving a Joule Thief for the third day. With a load of about 1 mA the four cells in series are easily holding 1,6 Volt (0.4 Volt each cell).

With a 10 mA load the four cells are holding 0.6 Volt (0.15 Volt each).

I had to add water on the second day (with a pipette) and constructed a "press mechanism" to hold the aluminium sheets and the copper wire windings closer together (see attached photo). This increased the output (short circuit current now up to 18 mA).

Greetings, Conrad

conradelektro

  • Hero Member
  • *****
  • Posts: 1842
Re: Working Air Battery
« Reply #140 on: July 04, 2010, 04:22:01 PM »
An other cell based on Pete's (PeteIdl4) aluminium - copper wire cell:

Because I like the aluminium - salt water paper - copper cell (the materials are easy to obtain) I built another one.

This time I used a copper sheet (instead of the copper wire) and an aluminium sheet (instead of soft drink cans) to see if that works better. The paper was soaked in 10% salt water (10 grams salt in 90 grams tap water). The metal sheets are 60 x 90 mm (rather small).

It seems that a "press mechanism" provides higher amperage, therefore I built four cells which are tightly pressed together.

This design also allows rapid assembly and disassembly (in case one wants to change the paper or check corrosion on the metal sheets).

Results with four cells in series:

no load 2.6 Volt (4 x 0.65 Volt)

3 mA load 1.6 Volt (4 x 0.4 Volt)

7 mA load 1.2 Volt (4 x 0.3 Volt)

10 mA load 1.0 Volt (4 x 0.25 Volt)

short circuit current is up to 25 mA


7 to 10 mA (at 1 to 1.2 Volt) are enough to drive a Joule Thief with a few white LEDs. For instance one could build a flash light (for use at home) with such a "battery". It should take a very long time till the copper and aluminium are corroded (may be years). Water has to be added occasionally. And may be the paper has to be changed every few months because it might fall apart.

Of course, one could build much better batteries with other materials (graphite, zinc, magnesium and some acids), but the goal is to build a very simple battery with materials commonly available (or from materials which are often thrown away like soda cans and old cables or wire from torn down buildings).

My next attempt will be a steel - damp salt paper - copper cell.

Greetings, Conrad

rock321

  • Newbie
  • *
  • Posts: 14
Water/Air (water vapor) battery
« Reply #141 on: July 04, 2010, 08:16:00 PM »
Hello Everyone,

Vids have been uploaded regarding the 3 water battery experiments in case anyone is interested. The vids show a progression, ending at the third experiment with the tiny 1 inch by 1/8 inch units producing 3- 3.5 volts  each without any Joule thief or acid, just tap water and enough current to run super bright LEDS.

Blessings,

Littlechristgod


conradelektro

  • Hero Member
  • *****
  • Posts: 1842
Re: Working Air Battery
« Reply #142 on: July 04, 2010, 08:35:26 PM »
@ rock321

Could you tell us where the "vids about your water battery experiments" are to be found?

A link would be great.

Greetings, Conrad

blueplanet

  • Sr. Member
  • ****
  • Posts: 414
Re: Working Air Battery
« Reply #143 on: July 04, 2010, 09:44:37 PM »
Salt paper can absorb the ambient humidity, which could very likely shorten the battery's life.

Replication of Pete's (PeteIdl4) aluminium - copper wire cell:

See Pete's tutorial videos (and my photos below):
Part 1 http://www.youtube.com/watch?v=B9YqFY-Z0dk (video by PeteIdl4)
Part 2 http://www.youtube.com/watch?v=ZeQof7ue9xA (video by PeteIdl4)

- Kitchen paper towel sheets were soaked in saturated salt water and then dried in the sun. They were a bit stiff after that but that helped when rapping the paper over the inner aluminium sheet and over the copper wire windings.

- When winding the wire over the (paper covered) inner aluminum sheet I took care that the windings did not touch.

- The outer aluminium sheet and the inner aluminium sheet are held together by a little screw which also holds the cable to the aluminum.

- Air can enter the cells from three sides.

- Four cells are connected in series to get about 2 Volt (without load)

- After the cells were finished they showed about 0.5 Volt, but almost no current. So I added a little water with a pipette. Just enough to make the paper damp. After that I am getting great results (almost for three hours till now):


0.5 Volt without load

0.4 Volt with 1 mA load

0.2 Volt with 4 mA load

short circuit current is about 6 mA



I will report in the coming days how the four cells are holding out. They are driving a Joule Thief which draws about 1 mA (while the four cells in series hold 1.6 Volt steady).


@ Mk1 - Thank you for the aluminum cell PDF-document!


Greetings, Conrad

rock321

  • Newbie
  • *
  • Posts: 14
Re: Working Air Battery
« Reply #144 on: July 05, 2010, 10:57:57 PM »
Here's the link: http://www.youtube.com/Littlechristgod#p/u/2/JU5R9511CGg

Blessings,

Littlechristgod

conradelektro

  • Hero Member
  • *****
  • Posts: 1842
Re: Working Air Battery
« Reply #145 on: July 06, 2010, 09:43:30 AM »
@ rock321

Unfortunately you forgot to mention which metals you used for the cells presented in your videos?

The videos are therefore of no use, a waste of your own time and of the time of onlookers.

Either you disclose your cells completely or you keep them to yourself. Teasing people is bad form and not the purpose of this forum.

Greetings, Conrad

stephenafreter

  • Jr. Member
  • **
  • Posts: 54
Re: Working Air Battery
« Reply #146 on: July 06, 2010, 10:15:58 AM »
I bet it's silver wire and aluminium wire.
(Edit: May be silver soldering wire, or just silver coated copper wire )
But I might be wrong ...
Very good idea. Rock I am impressed by the power output !!! from such a tiny piece !!!

I am going to try the silver/alu
I just got aluminium wire roll, used for welding purpose, it's very cheap.
Silver wire is also relatively cheap, silver is at around 600 Euro per kilo.
Silver as a potential equal to carbon ( +0.8V ) and does not corrode in the process.
(Only graphite has higher positive potential at 2.2V, in the chart)

Edit: so much apparent power for such small pieces of wire, even using silver wire would be affordable, because 1 inch of silver wire would cost like 10 cents.
« Last Edit: July 06, 2010, 11:41:00 AM by stephenafreter »

Pirate88179

  • elite_member
  • Hero Member
  • ******
  • Posts: 8366
Re: Working Air Battery
« Reply #147 on: July 06, 2010, 10:23:53 AM »
I bet it's silver wire and aluminium wire.
But I might be wrong ...
Very good idea. Rock I am impressed buy the power output !!! from such a tiny piece !!!

I am going to try the silver/alu
I just got aluminium wire roll, used for welding purpose, it's very cheap.
Silver wire is also relatively cheap, silver is at around 600 Euro per kilo.
Silver as a potential equal to carbon ( +0.8V ) and does not corrode in the process.
(Only graphite has higher positive potential at 2.2V, in the chart)

Graphite or carbon does not corrode either and is much cheaper to obtain.  Check the metals chart I posted a bit back.  The best bang for the buck is graphite/magnesium

Bill

stephenafreter

  • Jr. Member
  • **
  • Posts: 54
Re: Working Air Battery
« Reply #148 on: July 06, 2010, 01:01:53 PM »
I have never seen such small pieces of wire giving 3.5 V and lighting a white LED directly ?!
Of course he has 2 cells in series, but it's still like 1.75V per cell !!!
And he says it's running since 1.5 month !!
I think he brought some metal from the moon or mars, because we don't have such here :)
http://www.youtube.com/Littlechristgod#p/u/0/PU-PxhFqAk8

stephenafreter

  • Jr. Member
  • **
  • Posts: 54
Re: Working Air Battery
« Reply #149 on: July 06, 2010, 01:08:02 PM »
Magnesium ribbon + Silver wire ?