Leaking cells is a pretty rare thing and can be very dangerous since the stew inside is very toxic.
I thought differently so i looked it up on wikipages (if you don't like the answer, edit the wiki):
<snip>
Because of low cost,
low toxicity, well-defined performance, long-term stability, etc. LiFePO
4 is finding a number of roles in
vehicle use, utility scale stationary applications, and
backup power.
[6] LFP batteries are cobalt-free.
<snip>
Reversible extraction of lithium from LiFePO4 and insertion of lithium into FePO4 was demonstrated. Because of its low cost,
non-toxicity, the natural abundance of
iron, its excellent thermal stability, safety characteristics, electrochemical performance, and specific capacity (170
mA·h/
g, or 610
C/
g) it has gained considerable market acceptance.
OTOH:
If you had LiFePo4, that many here talk about, then its clear that the polonium is very highly radioactive and toxic but fortunately has a very short half life.
