Abstract
Carbonate-based electrolytes are often employed as the preferred electrolyte for both Li-ion and Na-ion cells. Toinvestigate the fire risk during abuse conditions in real-life scenarios covering the full value chain, not only celllevelstudies but also component-level investigation is crucial. Hence, Na-ion advanced electrolyte combustiontests are performed employing the fire propagation apparatus also called Tewarson calorimeter. Heat andcombustion products releases are measured, making use of fire calorimetry laws and analytical techniques suchas FTIR, NDIR, FID, or paramagnetic analyzers, and optical measurement. Thermal and chemical impacts of Naionelectrolytes combustion and fires are assessed under well-ventilated and under-ventilated environments. Dataare then compared against a carbonate-based electrolyte used in Li-ion batteries to create a comparative studybetween these technologies. Overall, the heat released rate majorly depends upon the solvents used and is lessimpacted by inorganic Li or Na salts while the emitted gases depend on both solvent and salt chemistry. Anotherkey observation lies in the different fate of the fluorine element chemically bound to the concerned salts: insimilar burning conditions, F from NaPF6 decomposition is preferably converted in F-containing solid species inthe residues whilst LiPF6 gives off more gaseous species such as HF.