Battery Fires, page-105

Couple of years old but here in Oz also.

Deakin University researchers, in collaboration with University of Queensland, have developed a new non-flammable electrolyte material for use in sodium batteries, which provides a safer and cheaper alternative to lithium-ion batteries.

Electrolytes in traditional lithium and sodium batteries are commonly flammable, so this breakthrough – published this month in the prestigious journal Nature Materials – paves the way for a new critical material for safer batteries.

https://www.deakin.edu.au/about-deakin/news-and-media-releases/articles/new-discovery-shifts-sodium-batteries-from-risky-liquid-to-safe-solid