[bri3d]

https://www.nature.com/articles/s41598-017-09784-z

Many batteries have LiPF6 electrolytes, so HF is the big one when they combust.

And of course the most famous and common battery chemistry is still LiCo - so you've got Lithium salts and Cobalt, which you don't love to see get in ground water.

They're not too bad when they don't burn, but once they've burned, all bets are off - there are a lot of nasty byproducts.

[filmor]

LiPF6 = lithium hexafluorophosphate

HF = hydrogen flouride

[baq]

> HF = hydrogen flouride

otherwise known as hydroflouric acid. nasty stuff indeed:

> In addition to being a highly corrosive liquid, hydrofluoric acid is also a powerful contact poison. Because of the ability of hydrofluoric acid to penetrate tissue, poisoning can occur readily through exposure of skin or eyes, or when inhaled or swallowed. Symptoms of exposure to hydrofluoric acid may not be immediately evident, and this can provide false reassurance to victims, causing them to delay medical treatment.[24] Despite having an irritating odor, HF may reach dangerous levels without an obvious odor.[5] HF interferes with nerve function, meaning that burns may not initially be painful. Accidental exposures can go unnoticed, delaying treatment and increasing the extent and seriousness of the injury.[24] Symptoms of HF exposure include irritation of the eyes, skin, nose, and throat, eye and skin burns, rhinitis, bronchitis, pulmonary edema (fluid buildup in the lungs), and bone damage.[25]

https://en.wikipedia.org/wiki/Hydrofluoric_acid#Health_and_s...

[jlokier]

>> HF = hydrogen flouride

> otherwise known as hydroflouric acid. nasty stuff indeed:

Technically hydrofluoric acid is hydrogen fluoride dissolved in water.

But yes, nasty stuff, and that fine distinction doesn't matter when HF gas spreads through the air, meets biology and immediately turns into the acid on contact.

[kwhitefoot]

> flouride

fluoride

Doesn't anyone use a spell checker any more?