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Fluorine in lithium batteries (16/02/22 10:25:40)
    Fires in old lithium batteries are dangerous - not only because of the fire itself, but because of the presence of LiPF6 - lithium hexafluorophosphate.

    https://en.wikipedia.org/wiki/Lithium_hexafluorophosphate

    "The electrolyte fire will generate substantial amount of HCl, HF, CO, HCN, and potentially SO2 and H2S, depending on the battery technology and the electrolyte technology."

    https://solarfiresystems.com/news/suppressing-lithium-ion-battery-fires

    One can never be sure of the actual 0battery technology when there is a battery fire. Always have in mind that HF is likely to be in the smoke.

    Remaining charge in batteries may be a fire risk too, if batteries are opened or damaged accidentally.

    This means that dismembering of Li-batteries for recycling is for professionals only - working in adequately secured facilities.

    There are articles about it in the open. But the big folks are already there.
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Fluorine in lithium batteries