Flexible graphite sheets for batteries

[@sure5291]

Thank you very much. Your video is highly educational.

[@jarusRnD]

Hi Mr. Claudio, I’ve been following your incredible videos on supercapacitors and truly admire your expertise. My client is exploring large-scale supercapacitor manufacturing, and your insights could be invaluable. Specifically, we’re curious about scalability (large units vs. clusters), real-world performance vs. traditional batteries, and challenges in production. Would you be open to a quick discussion? Looking forward to your response!

[@claudiohomelab8181]

Hi Jarus , thank you for appreciating my work. To be able to talk in more depth you can contact me on my email: [e-mail] Kind regards Claudio C.

[@nrusinghabehera1984]

Thank u Sir for sharing valuable information blended with your experience.

[@suprayogi340]

thanks a lot sir for sharing this invaluable treasure....because the net of life starts from a super energy source...in the future I'll wait for it to be made...warm greetings from me always healthy and ever more successful...tanks very much

[@claudiohomelab8181]

Thank you for appreciating my work

[@suprayogi340]

@@claudiohomelab8181 you are well come

[@dkjawahar-techexpt671]

Thank you for sharing useful information and the efforts taken to take the video. From Jawaharlal Bharat INDIA 🙏

[@claudiohomelab8181]

Thank you for your understanding, it is a pleasure for me to share this information, from Claudio Cervellin, Italy

[@kazeem-mustapha]

What additives can be added to the slurry to obtain a lower resistance?

[@claudiohomelab8181]

Acetylene black

[@kazeem-mustapha]

@@claudiohomelab8181 It seems you didn't add this additive. Where can I obtain this additive?

[@claudiohomelab8181]

Acetylene black is an expensive product, that's why I didn't use it. Now I'm preparing low-resistance carbon electrodes for supercapacitors, without using acetylene black, so far I have managed to have electrodes with R < 1ohm @@kazeem-mustapha

[@kazeem-mustapha]

@@claudiohomelab8181 I'm looking forward to this video

[@claudiohomelab8181]

@@kazeem-mustapha OK

[@muhammadgattan8572]

is that any journal that lead you to make this carbon graphite sheet,if you could kindly provide the title and link for my research journal, thank you

[@claudiohomelab8181]

no magazine, it was just my idea, I had a few kilos of graphite powder and I thought I'd use some of it in the making of these sheets

[@MrMraza123]

Very nice. Thank you for sharing

[@andrzejadamczyk3372]

This looks really awesome. How about durability?

[@claudiohomelab8181]

As for the durability of these graphite electrodes, there are no problems in contact with salt electrolytes, I have some cells with LiClO4 and LiCl electrolyte, and electrodes aluminum - graphite sheet still working after 2 years. They cannot be used with strong acids because they are slowly dissolved, with concentrated NaOH KOH they are slowly consumed, if the solutions are diluted they resist enough.

[@andrzejadamczyk3372]

@@claudiohomelab8181 I thaught that they may react with the glue. Anyway awesome work.

[@jrgtsmith3707]

que clase de carbon se debe usar?? el activado tiene una resistencia de casi 1 M y el grafito en polvo infinito

[@claudiohomelab8181]

There are 2 types of carbon used in this preparation. 1 Carbon Black Nanometric powder, there are different types of carbon black, the cheapest are used as a pigment but have a conductivity not too high, the best is Acetylene Black which offers high conductivity but comes at a high cost. Of course, the use of the carbon black type, greatly affects the conductivity of the sheets that are prepared. 2 graphite micrometric powder, this powder is always conductive, if I prepare a pile of my graphite and at the ends at the distance of 2 - 3 cm I place the 2 tips of a tester I read a resistance of about 1000 ohms, if I then compress this powder or use glue to the Polyinylacetate as a binder the resistance is lowered again. So if a graphite does not have these values, it is not a good graphite, or rather it is polluted by other products. Another component that can lead to bad results is polyvinyl acetate glue, I use Henkel AG's Pattex, which has proven to be excellent for this use. Other brands can lead to worse results, in these glues in addition to polyvinyl acetate there are also other additives that can affect negative on the final product. At the beginning I had used a glue of Chinese origin but the results were bad, greater electrical resistance of the sheets and frequent cracks in the final product. So polyvinyl acetate glues must first be tested.

[@tarijamil7710]

great video

[@yandantv7393]

It is not possible to obtain carbon black in my country. What can I use instead?

[@claudiohomelab8181]

You can not use it. However, remember that carbon black with its nanometric particles helps to lower the resistance of the electrodes. However, carbon black is also used as a pigment to make colors used in graphic arts, so you should find it in your country as well. Check it out here: www.jacksonsart.com/blog/2021/11/17/pigment-colour-index-black-pigments/

[@T0chukwuCharles-gm6ot]

What kind of binder can i use?

[@claudiohomelab8181]

Polyvinyl acetate (PVAc). other types of binders can also be used, such as polyvinyl alcohol (PVA) or carboxymethylcellulose (CMC). But PVAc is the easiest to use

[@malcolmwolfgram7414]

Why do you need the carbon black?

[@claudiohomelab8181]

Carbon black helps to lower the electrical resistance. Graphite is composed of micrometric particles, carbon black of nanometer particles, Carbon black fills the free spaces between graphite particles.

[@malcolmwolfgram7414]

@@claudiohomelab8181 Thank you!

[@jozefnovak7750]

Thank you very much!

[@ezioaudituore4189]

pls anyone could tell me how to increase the sheet flexibility

[@turisturis4569]

If you dry it like a solar panel, can the voltage increase? Sir, I'm from Indonesia and I have subscribed your channel. Thank You

[@claudiohomelab8181]

These graphite sheets generate a voltage when they are coupled by an electrolyte to an element of different electronegativity, there must always be an electrolyte. Thank you for subscribing

[@turisturis4569]

ok, I plan to try applying your composition in making solar panels in the hope of satisfactory results because I see that the working system is not much different from making batteries. If you have any suggestions on what materials are good or good for making solar panels. I thank you very much, healthy greetings always

[@OmidGipsy-vu1qu]

Very nice but grafit or grafin ???

[@claudiohomelab8181]

Graphite

[@radheyrajput646]

Dip coating could b helpful

[@realflow100]

Using nickel current collectors instead of aluminum. and a sodium sulfate or potassium carbonate electrolyte. and graphite and activated charcoal mixed 50/50 I was able to achieve a conductivity of 10 to 30 ohms directly measuring with the probe of multimeter anywhere across the surface of the active material on resistance scale setting I also tried a sample with pure graphite only and achieved 0.5 to 2 ohms. Nickel works much better than aluminum foil. more durable. more resistance to electrolyte and very high performance. I achieved over 500mA of current maximum charging current from a 0.57 farad test sample being able to charge and discharge instantly in less than one second. Very low internal resistance. and much more powerful. Size was only 0.4 inch by 1.25 inch and active material thickness only 0.3mm And a sheet of angel soft brand toilet paper tissue. Or a sheet of coffee filter paper (Coffee filter paper better durability more porous and consistent thickness) cut to size It works up to about 1 to 1.2 volts with very high performance. I used 10 to 20% polyvinyl acetate by weight to dry active material powder mix as the binder. no graphite sheet. no stainless steel mesh. nothing extra. Just be sure to roughen up the surface of the nickel sheets or foil before applying the active material layer to get it to stick better. Paint and spread a thin layer and let it dry overnight.

[@claudiohomelab8181]

Thanks for sharing news about your trial, it's useful news! I use aluminum foil as a collector which then undergoes corrosion. In my last video I made a supercapacitor with protected aluminum that should solve the corrosion problem. For now, it works, but we will have to wait to see the final results. If it goes wrong I will use other metals, such as nickel foil, an alternative could be stainless steel foil

[@realflow100]

@@claudiohomelab8181 Yes stainless could also be used. Nickel might be slightly easier to work shape cut or handle. sand or roughen the surface etc. I recommend if your using flat sheets to highly roughen the surfaces thoroughly with sandpaper or similar roughening options before applying the active material coating. Makes it stick a lot better and you get a much better easier wetting of the active material and better bond. more conductivity. Sodium sulfate will give highest performance but too much will cause crystal precipitation to form. At room temperature probably 50% to 75% of the maximum solubility will be a good target. Too close to 100% will form precipitation and reduce performance. Nickel works extremely well much better than aluminum No oxide layer formation and high resistance to corrosion in neutral or strong alkaline electrolytes.

[@jrgtsmith3707]

i made it it dint work

[@teknosql4740]

This is not correct way how to make flexible graphite foil for battery

[@claudiohomelab8181]

It's interesting what you say. Can you tell me where to find information about these graphite foils to be used directly as a current collector? The electrodes that I prepare with these foils have a stainless steel mesh manifold, so in effect they are cathode material

[@wwabete2009]

There are so many ways of doing anything!!! I think we should learn to appreciate what people offer to us for information. If you know any other ways, then it would be better that you share the information rather than seek for non existing mistakes from people who are taking their time to inform people like us. I am an electrochemist and I deeply appreciate the efforts and work of our dear claudiohomelab!!! Let's encourage him and let's share the little or the much he offers. It's a gift!!!

[@wwabete2009]

@@claudiohomelab8181 Sorry for those unscientific words from our friend! Keep your head high and just keep on keeping on with your great work! We need you! There will be distractions all over but the world needs you - remember that! We need people like you ready to share the little precious experiments with the rest of the world. Congratulations!

[@claudiohomelab8181]

Thank you very much for what you have said

[@wwabete2009]

@@claudiohomelab8181 You're welcome!