Sourcing parts
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@Vorg I did my homework and research the material but sourcing mostly industrial use material can be challenging as an amateur. Especially since the manufacturer in this case is from the USA and I'm in Europe.
@sepi said in Sourcing parts:
@Vorg I did my homework and research the material but sourcing mostly industrial use material can be challenging as an amateur. Especially since the manufacturer in this case is from the USA and I'm in Europe.
We strongly sympathize with you on this front! We've tried to make it as sourcable and low-cost as possible, but this has it limits.
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@Vorg I did my homework and research the material but sourcing mostly industrial use material can be challenging as an amateur. Especially since the manufacturer in this case is from the USA and I'm in Europe.
@sepi We are in Europe and we sourced everything as private individuals, so it can be done! Let us know if we can be of any additional help.
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About the triethylene glycol: can it be substituted for some other glycol maybe? I find it slightly hard to find. What's its purpose anyways?
@sepi No, it absolutely has to be triethylene glycol. Other glycols won't work, its chemical structure is exactly required to stabilize I5- in solution. If you're in the EU, you can get it from laboratodiumdiscounter in the Neatherlands (https://www.laboratoriumdiscounter.nl/es/trietilenglicol-99-extra-puro.html). It is not very expensive, 1L is like 15 EUR.
It's main purpose is to stabilize higher order polyiodides in solution and therefore prevent solid I2 formation at high SOC values. However if you don't go to high SOC values (keep the battery charge state low, then you can do without it).
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Ahh, excellent. Thanks for both the new reagents source and the explanation. ChatGPT told me that Propylene glycol might work, but then again why trust it :).
@sepi It doesn't, propylene glycol was also tested on the research paper that found triethyleneglycol worked. You need a very specific structure to stabilize the polyiodides.
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@danielfp248 i just received the tubing and I think I ordered the wrong one. I guess I didnct read correctly what you wrote to me about it. I got PharMed BPT tubing that is not lined with teflon/ptfe. Am I correct that I should order the teflon lined one explicitely? Also how did you know that the one I originally wanted to order (as seen on screenshot) is not good?
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@danielfp248 i just received the tubing and I think I ordered the wrong one. I guess I didnct read correctly what you wrote to me about it. I got PharMed BPT tubing that is not lined with teflon/ptfe. Am I correct that I should order the teflon lined one explicitely? Also how did you know that the one I originally wanted to order (as seen on screenshot) is not good?
@sepi The pharMed BPT is not the correct tubing. It will work for a while but will slowly leak iodine at high SOC values (especially above 50% SOC). You should order the teflon lined one explicitly, they refer to it as "tygon chemical tubing". Make sure to confirm they are sending you PTFE lines tubing. As I mentioned they do NOT sell this through aliexpress so you will need to contact them directly.
Note that you can still run tests at lower SOC values with normal BPT tubing.
