Étude expérimentale du comportement au feu d’électrolytes de batteries Li-ion

Abstract : Li-ion battery electrolytes composed of flammable organic carbonates and a lithium salt play an important role regarding electrochemical performances but also its chemical formulation contributes to battery behavior in case of failure. In order to better understand and formulate future electrolytes, integrating intrinsic safety aspect beyond performances, it is first necessary to understand the phenomena related to the electrolyte during a Li-ion battery failure. After assessing the fire behavior of individual organic carbonates solvents and their mixtures, the influence of the nature of the electrolyte salt on combustion phenomena and toxic gas release was studied in the framework of the DEGAS regional project. Fire tests were performed thanks to the Tewarson calorimeter on electrolytes containing a classical salt LiPF6 and on an electrolyte containing a salt under development, LiFSI. It was shown that the first stage of combustion is governed by the more volatile solvent (linear carbonate) and the influence of adding salt was observed in the second stage. The fire induced toxicity in well ventilated conditions is mainly governed by the nature of the salt, showing very limited concerns that emanate from the organic solvents.
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Gebrekidan G. Eshetu, Jean-Pierre Bertrand, Amandine Lecocq, Guy Marlair. Étude expérimentale du comportement au feu d’électrolytes de batteries Li-ion. Rapport Scientifique INERIS, 2015, 2014-2015, pp.16-17. ⟨ineris-01869524⟩

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