Centre National De La Recherche Scientifique

Sorbonne Université

College De France

Guochun Yan

Jean-Marie Tarascon

An electrolyte composition includes at least a sodium salt dissolved in at least one solvent and a combination of additives. The solvent is any of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, propylene carbonate, ethyl acetate, ethyl propionate, methyl propionate, 4-fluorotoluene, 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether, di-fluoro ethylene carbonate, ethyl difluoroacetate, or mixtures of the foregoing. The combination of additives includes at least sodium difluoro(oxalato)borate (NaODFB) and tris(trimethylsilyl)phosphite (TMSPi).

Electrolyte composition for sodium-ion battery

Some embodiments include an electrolyte composition for a battery using sodium ions as electrochemical vector, to the use of such an electrolyte composition as non-aqueous liquid electrolyte in a sodium-ion battery and to a sodium-ion battery comprising such a non-aqueous liquid electrolyte. In some embodiments, the amount of (oxalato)borate ranges from 0.05 to 10 wt. %, relative to the total weight of the electrolyte composition.

Electrolyte composition including a specific combination of additives, its use as non-aqueous liquid electrolyte in a Na-ion battery and Na-ion battery including such an electrolyte composition

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Guochun Yan