Mostly non-toxic or low-toxic.
Compared with traditional batteries such as lead acid, nickel chromium, and nickel hydrogen, lithium batteries do not produce any toxic and harmful heavy metal elements and substances such as lead, mercury, cadmium, etc., and have relatively little pollution. The electrolyte is an organic solvent and a lithium salt, and most of them are non-toxic or low-toxic; however, the lithium battery decomposition or hydrolysis product is hydrofluoric acid and other fluorine-containing compounds, which have certain corrosiveness and toxicity.
The lithium ion battery itself does not contain highly toxic substances, and the carbon of the negative electrode and the metal oxide of the positive electrode are basically non-toxic. Since lithium-ion batteries are a sealed system, they are not exposed to normal use. "In any case, its impact is much smaller than the most widely used lead-acid batteries.