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Is this the Holy Grail of home energy storage for DIYers?
#31
I ordered this one, its a little to much, if someone is interested to buy a piece in 5 or 10 meters or so send me a pm.
https://www.caplinq.com/linqstat-xvcf-20...eries.html

For the graphite foil this is cheap enough:
https://www.graphite-shop.com/de/folie-D...7-102.html
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#32
I will follow this with high interest.

I am thinking about building a nickel iron test cell one day. Imo the materials needed can be sourced rather easy.

Anyone here ever built such a cell?
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#33
Imo the materials needed can be sourced rather easy.

I hope so for you.
In your neighbors country, be prepared to do a lot of explanation, send a lot of email and get a lot of rejections.
And if you can find a company....dig deep in your wallet, i assume that you are also no millionair Sad
Waiting for my graphite foil at the moment.
I really hope that they are more willing in your country.
Sended you a pm

Best
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#34
(02-12-2020, 09:43 AM)100kwh-hunter Wrote: Imo the materials needed can be sourced rather easy.

I hope so for you.
In your neighbors country, be prepared to do a lot of explanation, send a lot of email and get a lot of rejections.
And if you can find a company....dig deep in your wallet, i assume that you are also no millionair Sad
Waiting for my graphite foil at the moment.
I really hope that they are more willing in your country.
Sended you a pm

Best

Hi, concerning chemicals for the ni fe cell I figured it out already.

The chemicals I need to make the active materials for the electrodes are:
- HCl to be found in any hardware store
- NaOH: common drain cleaner, everywhere to be found
- Iron oxide: easily made through electrolysis and scrap metal. Scrap metal is no problem
- Nickel oxide: can be found online with pottery shops. Apparently it is a chemical used in glazing pottery...

Beware, I am still in the figuring it out phase, the actual building and testing will take me awhile. One day I plan on doing it. In the mean time I will be following this thread with high interest!

Thank you very much for sharing this adventure and doing it!

Good luck and keep up the good work

PS: no unread PM's at the moment
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#35
Thumbs Up 
NaOH, be sure its 98+ and no zinc or aluminum pellets in it.
Soap making hobbyists sell it also.


Iron oxide: easily made through electrolysis Big Grin Big Grin Big Grin , ...made me laugh
You are aware of what you are doing Cool.

I think my pm and your replay just crossed each other, just offered to help.
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#36
(02-12-2020, 12:35 PM)100kwh-hunter Wrote: NaOH, be sure its 98+ and no zinc or aluminum pellets in it.
Soap making hobbyists sell it also.


Iron oxide: easily made through electrolysis Big Grin Big Grin Big Grin , ...made me laugh
You are aware of what you are doing Cool.

Well I tend to research and read a lot before doing something. A lot of stuff I teach my self, I try out a lot and view a lot of youtube films.
If a certain technique to do something turns out on ten different youtube films, all the same way, then I tend to believe it's something that can be done that way and I'll try it.
100kwh-hunter likes this post
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#37
They are really simple to make, simpler than was show in his videos.
Depending on the tools you have and your handywork.

Cut up a jerry can made out of hdpe strips in the measurements needed by you.
Create a jig.
Put your cleaned strips into a preheated oven, 100 celcius will do the trick.
Give it ~10 min to let the heat sink in, just enough to soften it up.
If the touch is short you can do it with bear hands.
Put them into the jig and allow to cool.
Melt with a soldering iron and a leftover piece the corner close.

Very important step!
Take your baking paper and household iron to melt and even out  the edges, both sides, cut excess materials in the inside.

Proceed with your carbon back filled hdpe and the oasis.
Close the other side.
Drill 2 holes, one for the funnel, very tight fit (old syringe in my case 4.2 millimeters) and one hole to let the air out(1mm).

With the graphite foil (still waiting for my delivery) or your aluminum tape to attach your wires.
your build up would look like this:
Tape or graphite foil.
Blue wire
4 layers of corbon black
2 cm thick oasis.
4 layers of carbon black
Red wire
Tape or graphite foil

Neg side is always up! very important.

Started the initial charge of cell 1 at 3.30V for 3 hours, there was no measurable ma feed.
When i disconnected the cell after 3 hours the meter was reading 1.81V.
This morning (after 16 hours) the cell measured 0.51v, bummer, big bummer, but it still hold some.
The cell is back on charge now, i will give it a day.

What i think of what the possible causes are about what went wrong:
I did not do a good fill up of the electrolyte.(impatience perhaps)
Tape could be not up to the job.

Did not dissolve the ZnBr2 good enough.
When i try to dissolve the ZnBr2 in demineralised water, not everything wanted to dissolve, i suspect some zinc crystals are left over.
The left over fluid (after several times of vigorous stirring and the allowed time for settling) is not entirely clear, still "foggy".
Any thoughts about dissolving the ZnBr2? Huh

How i made the ZnBr2: I just throw the stuff into one cup. 40 grams and 100cc demineralised water in a cup(~1.75 M), give it every hour a good stir for 4 hours, let it settle for 8 and one for 12 hours.
Will keep you posted, thanks
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#38
(02-14-2020, 09:55 AM)100kwh-hunter Wrote: They are really simple to make, simpler than was show in his videos.
Depending on the tools you have and your handywork.

Cut up a jerry can made out of hdpe strips in the measurements needed by you.
Create a jig.
Put your cleaned strips into a preheated oven, 100 celcius will do the trick.
Give it ~10 min to let the heat sink in, just enough to soften it up.
If the touch is short you can do it with bear hands.
Put them into the jig and allow to cool.
Melt with a soldering iron and a leftover piece the corner close.

Very important step!
Take your baking paper and household iron to melt and even out  the edges, both sides, cut excess materials in the inside.

Proceed with your carbon back filled hdpe and the oasis.
Close the other side.
Drill 2 holes, one for the funnel, very tight fit (old syringe in my case 4.2 millimeters) and one hole to let the air out(1mm).

With the graphite foil (still waiting for my delivery) or your aluminum tape to attach your wires.
your build up would look like this:
Tape or graphite foil.
Blue wire
4 layers of corbon black
2 cm thick oasis.
4 layers of carbon black
Red wire
Tape or graphite foil

Neg side is always up! very important.

Started the initial charge of cell 1 at 3.30V for 3 hours, there was no measurable ma feed.
When i disconnected the cell after 3 hours the meter was reading 1.81V.
This morning (after 16 hours) the cell measured 0.51v, bummer, big bummer, but it still hold some.
The cell is back on charge now, i will give it a day.

What i think of what the possible causes are about what went wrong:
I did not do a good fill up of the electrolyte.(impatience perhaps)
Tape could be not up to the job.

Did not dissolve the ZnBr2 good enough.
When i try to dissolve the ZnBr2 in demineralised water, not everything wanted to dissolve, i suspect some zinc crystals are left over.
The left over fluid (after several times of vigorous stirring and the allowed time for settling) is not entirely clear, still "foggy".
Any thoughts about dissolving the ZnBr2? Huh

How i made the ZnBr2: I just throw the stuff into one cup. 40 grams and 100cc demineralised water in a cup(~1.75 M), give it every hour a good stir for 4 hours, let it settle for 8 and one for 12 hours.
Will keep you posted, thanks

Don’t give up. Failures learn you things! I also have a dream project i am working. Failures happen, but in the end they give progress
AndyMc1970 likes this post
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#39
A wise man stated 2000 years ago: a human is learning from his successes, but he will learn more from his failures.
I don't follow my dreams: i chase them Cool
Only when there is no way out, i quit.
Those three sentences kept me running for the last 40 years. Big Grin Tongue

Cell one give me a surprise this morning...
I disconnect the charger yesterday, check the voltage after 15 minutes = 1.79V, 16 hour later the cell was at 1.71V.
His second charge was for 4 hours at 3.3v, beginning at 0.03a and ended at 0.4a.
This cell has 30cc electrolyte in it.
Possibility is that the electrolyte must be activated?
And clearly not full enough.

Cell 2 after 24 hour of gravity filling is full = 55cc.
I will put this one to the test.

For the fog in the solution, it is simpler than i thought?
There is one part br to much, you must make it yourself?
Or add more zinc?
For a balanced solution is 1 part zn and 1 part br, i ordered znbr2.

If wanted i keep you daily updated(give a like), or it is to much?
Best
Ivo Staelens likes this post
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#40
Keep the updates coming!
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