Electrolyte composition and use thereof in lithium-ion batteries
AssigneesHydro-Quebec, Arkema France
InventorsSabrina PAILLET, Gregory SCHMIDT, Ian CAYREFOURCQ, Julie HAMEL-PÂQUET, Ali DARWICHE, Gabriel GIRARD, Joël FRÉCHETTE, Sébastien LADOUCEUR, Abdelbast GUERFI, Karim ZAGHIB
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Abstract
Electrolyte compositions comprising lithium hexafluorophosphate, lithium 4,5-dicyano-2-(trifluoromethyl)imidazolate, a solvent, and at least one electrolytic additive, are herein described. The present application also describes the use if these electrolyte compositions in batteries, e.g. within a temperature range higher than or equal to 25° C.
Claims23
Electrolyte composition comprising lithium hexafluorophosphate, lithium 4,5-dicyano-2-(trifluoromethyl)imidazolate, at least one solvent, and at least one electrolytic additive, said composition comprising:
- a total concentration of lithium hexafluorophosphate and lithium 4,5-dicyano-2-(trifluoromethyl)imidazolate less than or equal to 1 mol/L relative to the total volume of the composition, and
- a lithium 4,5-dicyano-2-(trifluoromethyl)imidazolate concentration less than or equal to 0.3 mol/L relative to the total volume of the composition.
Use of lithium 4,5-dicyano-2-(trifluoromethyl)imidazolate in an electrolyte composition comprising lithium hexafluorophosphate and at least one electrolytic additive for:
- improving a Li-ion battery life;
- and/or
- improving a Li-ion battery cycling stability;
- and/or
- reducing a Li-ion battery irreversible capacity;
- especially in a temperature range above or equal to 25° C., preferably between 25° C. and 65° C., advantageously between 40° C. and 60° C.;
- the composition being such that:
- the total concentration of lithium 4,5-dicyano-2-(trifluoromethyl)imidazolate and lithium hexafluorophosphate is less than or equal to 1 mol/L relative to the total volume of the composition;
- and
- the lithium 4,5-dicyano-2-(trifluoromethyl)imidazolate concentration is less than or equal to 0.3 mol/L, preferably less than or equal to 0.05 mol/L, relative to the total volume of the composition.
Dependencies are inferred from the claim text.