Below is an article I just read about how a Stanford lab has created a new concoction that makes Li Ion batteries pretty much non-flammable while also letting them operate safely at higher temps...added bonus higher capacity for same size to boot!
https://www.hagerty.com/media/maint...14833456fc60ebbe090bb573066a97a9e982e651b38c6
https://www.hagerty.com/media/maint...14833456fc60ebbe090bb573066a97a9e982e651b38c6