Conductive Adhesives Used in EDLCs/Supercaps

If no one else gives you a clear answer, I'd recommend a look through the patents.

SB,

This is probably a closely guarded secret, perhaps unique to specific manufacturers.

MB's reference to patent studies may, or may not, shed light on the formulation.

My experience with patent wording is that sometimes it is just clear enough to understand, but not so clear as to divulge specific formulations of materials.

Your motivation for the question is unknown, but, reverse engineering comes to mind here.

Have you done the unthinkable and asked a supplier?

I know this is OT, but decided not to mark it as such ;-)

lynlynch wrote: "My experience with patent wording is that sometimes it is just clear enough to understand, but not so clear as to divulge specific formulations of materials."

Interesting! I guess I've noticed the same thing, without really ever thinking about it. But, isn't that a violation of at least the spirit of patent law--the idea of a term of patent protection in exchange for disclosure of the invention.

Not that I have any need or intent atm, but I wonder if anyone has ever sued either the patent holder or the patent office (for failure to enforce the law) on that basis?

Unless the bonding mechanism/chemistry is the crux of the invention there is no particular obligation to disclose it. I've had discussions with my patent attorney over specificity, and he usually wins. Fuzzy is OK.

At least that's my understanding.

Not sure, after a quick internet search the data is a little vague but conductive adhesive is definitely mentioned a lot (just with little detail).

One site mentions "silver-filled epoxy resin", however this was the infamous EEStor barium titanate ultracapacitor developer, so that sort of fails your "commercial EDLC" requirement.

Anyone have a good link to conductive adhesives capable of high current flow as I am interested for product development?

I know I know.....an electrical conductive epoxy.

Most of which are propriatary secrets.

Are you sure that this connection is glued by conducting whatever?

If so let it be analised FTIR to disclose the type of glue, ICP or any other to see the metals.

If this is not a glue but a molecular bond I would take a SEM that is coupled to an ion-mass separator so you can see any interesting elements in the joint.

If you see nothing then its likely pure diffusion of a very few layers of atoms.

RHABE

Hi SuperBuzz,

I'm not entirly sure whether this product will suite your application. If not contact them, they may have what your looking for.

Hope this is some help to you. Sorry if the picture does'nt display (not sure how to do that), it's only a picture of two tins for the base resin and activator.

AREMCO-BOND™ 616 ELECTRICALLY CONDUCTIVE ADHESIVE

SUMMARY

Aremco-Bond^tm 616, a new silver-filled, low-cost, high temperature, electrically and thermally conductive adhesive developed by Aremco Products, Inc., is now available for electrical and electronic assembly applications to 360 ^oF (182 ^oC).

For more information visit www.aremco.com

CR4 Admin: Removed copy/paste of copyrighted info from another website and condensed to a single paragraph.

www.masterbond.com

Dear all, Thank you very much for all your various answers. To respond to some: 1)Unfortunately the patents I looked at, mentioned conductive adhesives as a possibility for adhesion but did not mention what they were :) Really falls into what some individuals discussed here as not facilitating the invention. The reason I say that is because the conductive adhesive could severely affects the resistance of the device which in turn would hurt the power of the supercap, a core feature of the energy storage device. (patents are awful :)) 2)I asked a Japanese manufacturer and they said...."noneyabusiness." :) 3)EEStor or the people who mention it say that it is an ultracapacitor. Then they say barium titanate. As far as I know an ultracap is an electrochemical capacitor. Barium titanate is a dielectric material used, most likely, in a solid-state capacitor, and that would imply that calling it a supercapacitor/ultracap/electrochemical cap might not be totally accurate from the conventional use of the buzz words :) 4)I am pretty sure commercial entities use conductive adhesives for the supercap carbon to metal bond, but I am not sure what it is. (based on discussion with japanese company) 5)Thanks for the references to conductive adhesives/epoxies, though what I was really hoping to find if someone had done similar work in the past and might have experienced it enough to reveal what kind of conductive adhesive/how much/how thick/cost it really might be? (e.g. someone who did some grad work on it or worked in a facility with it in the past, or maybe worked in batteries that might have happened to use it) Thank you all, SB

Epoxy id silve-PVAc based conductive epoxy. The patent is not there This is company secret. It is the weight of silver and type of solvent which is put it in and can provide you the details if you are interested and wants to make your own

If you are looking for an adhesive. Goto McMaster-Carr.

McMaster is general purpose adhesive solution and not a technological adhesive needs fulfilments.

My more than 20 years of experience is high end adhesive is developed based on problem solution based on needs of end user and adhesive manufacturers.

Needs are met by joint work and if the joint work is house hold need then is McMaster product line.