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Happy late Easter. I periodically refresh chemisting dot com to see if there is any news and noticed that the page is down. Is it maintenance or something going on ?

A v2.0 version, nice, and the 200mA (not 200mV :)) gives room for greater flexibility, so thanks for the information - wonderful :). Will look it over. I see, then by that fact, degassing dissolved oxygen (DO) also make sense since cyclability is greatly dependant upon a low amount of DO...

1224mV is in the grand scheme of things very useful. It is not as high as some other common chemistry's, but very useful. So good news indeed. Are you content with that potential ? I did a quick search for sulfonated membrane and there are several papers/study's. I'm not going to pretend I know...

So, are anyone of you actually saying that storing excess energy in the form of mechanical work (kinetic energy) done during the day when there is a surplus and later tapped into this potential when there is a need and that at the same time, such a system can be scaled to such a level there is...

Well that is too bad, the premise for the AquaPIM looked really good and now I'm sad..

Since I am not a chemist it can be challenging to know exactly where to look for information etc. But I like the silicon dioxide angle, so what if one takes a simpler rout and don't use sulfination but start with potassium silicate or sodium silicate and incorporate ionic salts and produce...

Lets cross the BMS river once you know the operational points :) - Edit - Saying that, there is an Open Source BMS system for flow battery's. "The architecture of foxBMS is the result of more than 15 years of development in innovative hardware and software solutions for rechargeable battery...

So what do you think is going on ? I looked at the supporting info but they don't provide any eq's, only quantity's and such. https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/slct.202201222

Membrion is letting me hang here, so I killed some time... and maybe you missed this one... AquaPIM... (no sulfation) specially developed for aqueous RFB. Go With the Flow: Scientists Design Better Batteries for a Renewable Energy Grid...

Yes one can buy FeCl solutions but some of them contain sulphuric acid like for etching solutions, so one has to be on guard and check the datasheet and the idea behind synthesising ferric chloride via muriatic acid was such that one ended up with (hopefully) a very pure solution and DI water as...

See, you do know ... I knew it :) All I need to know. I am sure that with the right equipment, these membranes can be made, but that is a completely different scenario. They are open for business, so lets hope they are interested in a nobody ;)

To all who are watching this thread and want to learn about battery's, like me :). I found a two part walkthrough of electrochemistry and batteries which I found to be both educational and entertaining to watch. I'm not going to lie, some of this stuff need time to mature, but besides that, its...

I can only comment on and for myself and the general consensus is like you have laid out. I certainly do not expect you to develop a 50kWh unit and point to it when people ask how to... LOL, that is up to anyone who wishes to do so, and that portion is yet to be discovered. If I may say so, you...

Not to hijack this thread, but I wonder how far one could be able to push the damp paper battery as a viable solution. If anything, that tech would be super DIY friendly and not too toxic.

I just noticed something regarding current density. Fumasep FS-930: 150-400mA/cm^2 CXM-200 (CMI-7000): <50mA/cm^2

Very true and 0.35M% is not a lot I'd like to get a small setup of mine this spring/summer and start a endurance test. I'd like to start with static crossover as well as doing cycles. I would need two different cell stacks. Both would need to use the same electrolyte batch to eliminate as many...

Got it. Because the two electrolytes are of different metal species, is there a way to recover crossover contamination or does that simply become a permanent loss of potential ? ... Iron salt have the advantage of being the same on both sides, crossover is not a contamination per say, just...

So the manganese oxide is reducing the options rather quickly it seems.

I'd say so yes. Elemental Bromine is toxic, so not a chemical to be taken lightly. The higher volumetric energy density is nice... but, higher can't come at any cost, which is the point here. Vanadium, Bromine, strong acids, expensive chemicals etc. All of this is what I am slowly trying to get...

Most excellent. Btw, got a price from the one retailer I talked to and both are at 20€/kg, so not an expensive substance. But for development, 250g should go a long way.

When I started my battery journey, I had no idea what it would involved or what the end station is. Both the former and later is evolving as we speak, which I am very... very happy for, and this is the entire reason for me being such involved... that and the prosperity for building myself and...

Exciting news for the separator. It is still and despite the use of sulfuric acid, a budget approach, which is part if your goal.

Got it. It takes time to develop projects under strict finances, but something is always better than nothing :) ******** I contacted Membranes International with this question and they replied with in quote Q: What is the expected life span of your CXM-200 in 3M NaCl solution ? I sent a...

Got an update from Membrion today, the team behind developed the ceramic silicon membrane. The rate of rejection or dismissal from those who develop and produce new and innovative membranes that could benefit the project is staggering. To say I am disappointed is an understatement. So far 3...

Some news. Been in contact with a Swedish spinoff company from KTH called Cellfion. In short, Cellfion is a cellulose polymer membrane which is very interesting for this application. Its early days for them and they are a small team of only 6 people, plus, they are waiting for some production...

I'm gonna address a few things in this one post, its simpler that way. 1) If we look at a 48V@10kWh Li-ion battery pack from LG Chem, then 7500€ is a fair price. Here we can expect roughly 3-5k cycles. If we then look at similar LFP battery pack, then we land between 5500-7500€ but get...

I see and thanks for the correction. I feel like removing that entry but will let it remain since its a good way to distinguish the organic and inorganic flow battery, just like plating vs non-plating. And If my many posts and "aggressive" participation in this thread is offensive, let me know...

Iron salt battery is interesting for sure. One aspect that I like is that I can take raw iron, plus 30% Muriatic acid (HCl), "shake and blend", vent off the H2 gas and I am left with FeCl in aqueous solution and both are plentiful, easy to get and not too expensive. So an all Iron battery from...

Thanks for the link, will dive in. Indeed, they make nano-cellulose and one need proper equipment for that, something neither of us have. But I do find it interesting non the less. I was also checking Fumapem FS-930, but it got higher resistance compared to CMI-7000. So if nothing changes...

I did check their price list and the price will drop a bit when buying in bulk, but yes, this will be the most expensive part of the system. CXM-200 (CMI-7000S) A 1.2m*0,5m sheet cost $200 not including shipping an taxes. If I add taxes and VAT which is around 30% and convert it to €, then 241€...