Flow Battery Research Collective

Here is a link to his presentation, thank you to Sanli for his support of our project! Useful if you are new to FBRC and trying to get a quick overview of what we are attempting to do. Here are the PeerTube and YouTube links.

So I mades some progress. I finished the raspi case without much fuss (although I must say it could be designed to use a bit less plastic). The button does not work, it's just a tiny bit short. Maybe because my UNO is super old and used a different button.[image: 1752347339548-img_20250712_203716-resized.jpg] I also received some tubing by Camoer but unfortunately I ordered the variant without PTFE inner lining. Apparently I can still use it for cycling until capacity of 50%. Let's see if I can get the correct one quickly enough. [image: 1752347551087-img_20250712_203634-resized.jpg] I also received my first baggy of ... KI from amazon. The rest of the chemicals are coming from some dutch web shop. And finally, the gasket 0.5 silikone film arrived. I tried manually cutting gaskets, with more or less succes. [image: 1752347700425-img_20250712_200820-resized.jpg] [image: 1752347720695-img_20250712_201335-resized.jpg] Only testing can tell of it will work :). [image: 1752347812166-img_20250712_202301-resized.jpg] [image: 1752347832934-img_20250712_205714-resized.jpg] They align ok, but I'm not really sure what will be important in the end.

Updates from @danielfp@chemisting.com during today's meeting: I started a test with 2M KI, 1M ZnCl2, 2M NH4Cl, 5% Trieg with Daramic and felt on both sides. Going to charge to 1.6V at 10mA/cm2, see if it makes any difference regarding stability with Trieg on subsequent cycles. I did one cycle at 10mA/cm2, charged to around 240mAh (noticed a dip indicating start of solid I2 buildup, so cut it there), discharged 180mAh. I am now charging to 150mAh at 30mA/cm2, normally I would see drops in capacity with cycling with Trieg at this level, we'll see if they happen. [image: 1747325869007-57810618-3e33-4f12-ad81-bc93fc620bcd-image.png] Seems to be stable now at 30mA/cm2. I will leave it cycling here longer, see if it starts decaying. [image: 1747325889390-778d48dc-3d94-4012-9de2-a0c45a4727b0-image.png] ok, went for 9 cycles with no issues at all. I am now going to cycle it to 1.65V, to the Nernst limit, see if it continues working equally well. Charging to 1.65V showed the weird start for the discharge curve, although with no apparent deterioration of the cycle characteristics after the first cycle. No evidence for solid iodine formation was present, so the solution is very well behaved. [image: 1747325914186-cc5413ce-ad2d-4ae5-b64d-ed8939f213cf-image.png] Test at 15mA/cm2 of the same cell. Some deterioration is now evident, charging to 1.55 V [image: 1747325934195-2dbc77b1-de09-4492-a3e2-5997e2517c81-image.png]

I'm no expert ether. We used quick setting plaster a lot in construction for repairs on a lot of things and now they have a "wood epoxy" which is an epoxy for wood repairs. You have a thing epoxy you brush on onto wood which provides a good bonding surface for dry rotted wood and then you mix an epoxy that works more like the quick setting plaster and creates a strong enough repair that you can nail it. These plasters and epoxies could be formed or poured to create a nice mold. For the quickset we could build up an area, then carve and shape it before it fully set. The surface is very smooth and with a spray sealer of some kind should be even better for molds. A quick look into casting, it looks like the most common is using silicon for making the mold. Yes it lets you do detail, but it is also soft and flexible. Not good for making thin plates without warpage.