Numerous laboratories are working towards reducing or eliminating the accidental risks of Li ion batteries by working on solid electrolytes. Researchers at ETH at Zurich are developing unique solid materials which even when brought to high temperatures will not ignite. by Denis Meyer @ elektormagazine.com:
This represents a double advancement over current Li ion batteries which contain inflammable gel electrolytes, because not only does the fire risk disappear, but constraints over form-factor are also much less.
Lithium ion batteries that work best at 95°C – [Link]