[maxvortex]

Hi to all.

What i have:
- graphite powder

What i want to do:
- 5x5 cm 2mm thick electrode mixed with graphite and clay

How should this electrode act:
- this should be solid plate and it should have the same characteristics and graphite rod.

Why i'm doing this:
- because i can not use graphite rod and design of the plate must be square shaped.
- so, i don't want to make nothing else, then change the shape of electrode.

Would it be possible to make something like this at home ?

Max

[Arkcon]

Hmmm ... tricky.  No, I don't think you can achieve the electrical characteristics of pure graphite with any other binder and powdered graphite.  The industrial method starts with any old carbon, and converts all of it into one piece of graphite by heating to 3000 C, but carbon powder, although slightly conductive, isn't as conductive as graphite, and the clay will just be in the was.

[maxvortex]

isn't as conductive as graphite, and the clay will just be in the way.

I agree, but i want to use graphite powder, not carbon.

In solid state graphite rod gives very good characteristisc as one part of battery but when i use graphite powder, current drops from 300mA to 0.5mA. Its quite unbeliveble because voltage stays almost the same. Of course graphite is used as current collector but i dont know why does the current drops so much. Graphite powder is pressed together so that resistance is quite small, but still it does not work. The minute i put graphite rod, current rises to 300mA.   

[curiouscat]

isn't as conductive as graphite, and the clay will just be in the way.

I agree, but i want to use graphite powder, not carbon.

In solid state graphite rod gives very good characteristisc as one part of battery but when i use graphite powder, current drops from 300mA to 0.5mA. Its quite unbeliveble because voltage stays almost the same. Of course graphite is used as current collector but i dont know why does the current drops so much. Graphite powder is pressed together so that resistance is quite small, but still it does not work. The minute i put graphite rod, current rises to 300mA.

Is the Resistance of both geometries about the same? Then it is puzzling.

[vmelkon]

A graphite sheet looks like a bunch of benzene rings connected together, without the hydrogen of course. The molecule doesn't go on forever. The molecule terminates at some point and from what I read somewhere, there are OH groups and other atoms/groups on the terminations. I'm guessing this can cause a lot of resistance.

[maxvortex]

Hi guys.

...I'm guessing this can cause a lot of resistance.
Hmmm, yea this could be problem. I will buy one sheet just to see the difference (if any).

Max