By coating the iron sulfide cathodes in polymers, a research team was able to create transition-metal sulfide-based lithium batteries with stable cycling and high safety. After 300 cycles, a lithium carbide iron disulfide pouch cell retained 72.0% capacity with no capacity degradation after 100 cycles.
  • @0x0@programming.devEnglish
    12•12 hours ago

    After 300 cycles, a lithium carbide iron disulfide pouch cell retained 72.0% capacity

    Put that on a phone and the battery will degrade almost 30% in one year… seems a lot tbh.

    • @OmgItBurnsEnglish
      5•5 hours ago

      But depending on cost, in my hopeful optimistic universe, that could mean bringing back replaceable batteries.

    • @scarabic@lemmy.worldEnglish
      4•5 hours ago

      As a point of reference, Google says that somewhere between 500-2000 cycles you can expect a regular lithium battery to degrade to 80%. So this is worse, but in the ballpark. Seems reasonable for a research prototype to be a little worse than a commercial product that’s had years to become highly optimized.

  • peopleproblemsEnglish
    15•17 hours ago

    But, do they cause a runaway thermal reaction if pierced?

    I demand spicy pillows, not mild ones

    • @nous@programming.devEnglish
      9•12 hours ago

      One of the fabricated battery pouch cells was even able to work after being folded and cut off. “That proves its high safety for practical application,” the researchers emphasized.

      If you can cut it in half and it still works I doubt piercing it will do much.

      • peopleproblemsEnglish
        9•7 hours ago

        Oh, oh god. I know exactly how I reasoned that.

        Slashing damage is different than piercing damage in the games I play. For whatever reason I ignored the context.

  • @calabast@lemm.eeEnglish
    32•22 hours ago

    I really like the safety aspect of this, but 72% capacity after 300 cycles seems low. What’s a use case scenario where this is preferable over lipo batteries?

    • @Ilovethebomb@lemm.eeEnglish
      38•22 hours ago

      Much more stable chemistry. In stationary applications, like UPS systems and off grid electrical systems, lead acid is still the standard, due to having stable chemistry, very unlikely to catch fire, and a cost to capacity ratio that is still very good.

      The degradation seems pretty bad, but if it’s stable from 300 cycles onwards, you could take 75% as the actual capacity of the battery.

    • TerkErJerbsEnglish
      12•22 hours ago

      Boats, planes, drones, phones, bikes… Anywhere that you can maximize storage cell capacity in odd shaped volumes and spaces/designs. It’s great.