Submitted 1 day ago by n3m37h@sh.itjust.works to technology@lemmy.world
https://pub-fee113bb711e441db5c353d2d31abbb3.r2.dev/VTT_CR_00092_26.pdf
They are testing a 26Ah battery pouch and were able to charge it at a 11C rate for 3 min and it retained 98.4% charge!!
Please don’t make the post link go straight to a file.
Weirds me out when I think I’m going to a website and suddenly it’s asking where I want to download to.
Sorry but there is only a PDF of the results, ill go make a website just so you and the 8 other people are weirded out by a PDF…
No worries. I found it for you. This looks like the original website you could have linked.
This result matches largely with the startups claims. Given what they tested, cycle times and aging are largely unknown and thermal management requirements are quite high for fast charging, this results in problems with packing, aging and charge losses. Its a nice first step, but there is a ways to go until market readiness IMHO.
I’m something of an electrical engineer but not a battery expert by any means.
If it’s truly a solid-state battery, thermal management is less of an issue since they won’t be limited to the usual -10 - 60 °C range which makes it easier to dissipate heat into the environment.
What makes me suspicious is that they claimed that the battery can operate at/above 100 °C safely without degradation, but in the 11C charging test they paused it because the temperature had reached 90 °C.
Man if this is actually real it wi be crazy. I’m waiting for some crazy limitation to be discovered.
Next week they are releasing more testing
The report is from an independant institute from Finland, not Poland:
VTT Technical Research Centre of Finland Ltd
I think the “it retains 98% charge” quote might be misleading. Thats true for the capacity (in Ah), but not for the energy (in Wh). The report shows this clearly in the tables:
Efficiency is about 83% if my math is right (which is still good).
Last paragraph
Under the specified test conditions, the cell was successfully charged at 5C for more than 9 minutes, and 100 % of the charged capacity was available during the subsequent discharge. The cell was also successfully charged at 11C for more than 3 minutes, with 98.4–99.6 % of the charged capacity available after a full charge.
realitista@lemmus.org 12 hours ago
So, a guy with a PHD thesis on solid state batteries is saying that these results are not as promised
n3m37h@sh.itjust.works 11 hours ago
I just watched this, I just want the battery to be real…
Pelicanen@sopuli.xyz 4 hours ago
As someone in the industry, I unfortunately highly doubt that the battery is real, at least in the way that they say it is. Individually, all of the claimed specs are within the realm of possibility, but combining all of them in one cell that supposedly does not contain lithium and is cheap to produce? Extremely unlikely.
What I suspect is that they have one or a few expensive laboratory-made cells that fulfill at least the performance claims so they can raise interest, but which are in no way possible to produce at a reasonable price point.