Donut Labs released VTT's independant test results!

Comments

• SnoringEarthworm@sh.itjust.works ⁨1⁩ ⁨month⁩ ago

  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.

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  • n3m37h@sh.itjust.works ⁨1⁩ ⁨month⁩ ago

    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…

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    • SnoringEarthworm@sh.itjust.works ⁨1⁩ ⁨month⁩ ago

      No worries. I found it for you. This looks like the original website you could have linked.

      https://idonutbelieve.com/

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• Nomad@infosec.pub ⁨1⁩ ⁨month⁩ ago

  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.

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  • Pelicanen@sopuli.xyz ⁨1⁩ ⁨month⁩ ago

    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.

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• realitista@lemmus.org ⁨1⁩ ⁨month⁩ ago

  Man if this is actually real it wi be crazy. I’m waiting for some crazy limitation to be discovered.

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  • n3m37h@sh.itjust.works ⁨1⁩ ⁨month⁩ ago

    Next week they are releasing more testing

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    • cron@feddit.org ⁨1⁩ ⁨month⁩ ago

      The report is from an independant institute from Finland, not Poland:

      VTT Technical Research Centre of Finland Ltd

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• realitista@lemmus.org ⁨1⁩ ⁨month⁩ ago

  So, a guy with a PHD thesis on solid state batteries is saying that these results are not as promised

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  • n3m37h@sh.itjust.works ⁨1⁩ ⁨month⁩ ago

    I just watched this, I just want the battery to be real…

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    • Pelicanen@sopuli.xyz ⁨1⁩ ⁨month⁩ 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.

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• cron@feddit.org ⁨1⁩ ⁨month⁩ ago

  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:

  Image

  Efficiency is about 83% if my math is right (which is still good).

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  • n3m37h@sh.itjust.works ⁨1⁩ ⁨month⁩ ago

    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.

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