<![CDATA[Zinc-Iodide]]>Starting a thread to keep track of our zinc-iodide development. Background in this blog post: https://fbrc.dev/posts/progress-update-dev-kit/#preliminary-results-from-first-chemistry-zinc-iodide

Current electrolyte composition is roughly 2M KI, 1M ZnCl2, 2M NH4Cl, 5% triethylene glycol, with a Daramic separator and graphite felt on both sides, no spacer.

]]>https://fbrc.nodebb.com/topic/18/zinc-iodideRSS for NodeThu, 18 Jun 2026 17:56:52 GMTTue, 13 May 2025 21:10:41 GMT60<![CDATA[Reply to Zinc-Iodide on Thu, 26 Mar 2026 12:57:45 GMT]]>It's the same electrolyte formulation as currently in the docs

]]>https://fbrc.nodebb.com/post/632https://fbrc.nodebb.com/post/632Thu, 26 Mar 2026 12:57:45 GMT<![CDATA[Reply to Zinc-Iodide on Thu, 26 Mar 2026 12:57:21 GMT]]>Link: https://dualpower.supply/posts/lab-notebook-9/

]]>https://fbrc.nodebb.com/post/631https://fbrc.nodebb.com/post/631Thu, 26 Mar 2026 12:57:21 GMT<![CDATA[Reply to Zinc-Iodide on Thu, 26 Mar 2026 12:57:05 GMT]]>Doing some tests now on this to get my wet lab back in action, here are the conditions and results so far on my blog

]]>https://fbrc.nodebb.com/post/630https://fbrc.nodebb.com/post/630Thu, 26 Mar 2026 12:57:05 GMT<![CDATA[Reply to Zinc-Iodide on Thu, 15 May 2025 17:37:25 GMT]]>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.

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.

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.
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
2dbc77b1-de09-4492-a3e2-5997e2517c81-image.png

]]>https://fbrc.nodebb.com/post/109https://fbrc.nodebb.com/post/109Thu, 15 May 2025 17:37:25 GMT<![CDATA[Reply to Zinc-Iodide on Tue, 13 May 2025 21:26:27 GMT]]>Currently, it seems for the Zn-I TriEG chemistry, there needs to be initial break-in cycle(s) at lower current density---some sort of formation process, maybe---for extended cycling to be possible. This is what we're working on presently

]]>https://fbrc.nodebb.com/post/96https://fbrc.nodebb.com/post/96Tue, 13 May 2025 21:26:27 GMT<![CDATA[Reply to Zinc-Iodide on Tue, 13 May 2025 21:24:42 GMT]]>This is why we can't use BPT tubing in the peristaltic pumps of the dev kit for this chemistry:

image.png

@danielfp@chemisting.com

anolyte (right) and catholyte (left) tubings. They are both exact same external and internal diameters. The catholyte one is obviously slashed and the catholyte pump had a lot of iodine inside. So, lastest longer but definitely not impervious to it

]]>https://fbrc.nodebb.com/post/95https://fbrc.nodebb.com/post/95Tue, 13 May 2025 21:24:42 GMT