Fluorinated derivatives of meldrum's acid, a method for the preparation of the same, and their use as a solvent additive
Disclosed are certain fluorinated derivatives of Meldrum's acid as novel compounds, preparation methods for the same, their use in Li ion batteries, Li air batteries and Li sulphur batteries as well as solvent compositions, electrolyte compositions and respective batteries containing them.
1. An electrolyte composition for lithium ion batteries, lithium air batteries or lithium sulfur batteries, containing at least one solvent and at least one electrolyte salt and a compound having formula (I):
wherein R1 and R2 independently denote hydrogen, halogen, or linear or branched alkyl group optionally substituted by one or more halogen atoms; and wherein R3 and R4 independently denote halogen, or linear or branched alkyl group optionally substituted by one or more halogen atoms; provided that at least one of the R1 to R4 is fluorine or fluorinated substituent.
2. A lithium ion battery containing a compound having formula (I):
wherein R1 and R2 independently denote hydrogen, halogen, or linear or branched alkyl group optionally substituted by one or more halogen atoms; and wherein R3 and R4 independently denote halogen, or linear or branched alkyl group optionally substituted by one or more halogen atoms; provided that at least one of the R1 to R4 is fluorine or fluorinated substituent.
3. The lithium ion battery according to claim 2 , wherein R1 and R2 independently denote hydrogen, fluorine, or linear or branched alkyl group optionally substituted by one or more fluorine atoms; and wherein R3 and R4 independently denote fluorine, or linear or branched alkyl group optionally substituted by one or more fluorine atoms; provided that at least one of the R1 to R4 is fluorine or fluorinated substituent.
4. The lithium ion battery according to claim 3 , wherein R1 is fluorine.
5. The lithium ion battery according to claim 4 wherein R2 is hydrogen or fluorine.
6. The lithium ion battery according to claim 5 , wherein R3 and R4 are independently selected from the group consisting of fluorine, methyl, monofluoromethyl, difluoromethyl and trifluoromethyl.
7. The lithium ion battery according to claim 5 , wherein the compound has formula (I-1), (I-2), (I-3) or (I-4):
8. The electrolyte composition according to claim 1 , wherein R1 and R2 independently denote hydrogen, fluorine, or linear or branched alkyl group optionally substituted by one or more fluorine atoms; and wherein R3 and R4 independently denote fluorine, or linear or branched alkyl group optionally substituted by one or more fluorine atoms; provided that at least one of the R1 to R4 is fluorine or fluorinated substituent.
9. The electrolyte composition according to claim 8 , wherein R1 is fluorine.
10. The electrolyte composition according to claim 9 wherein R2 is hydrogen or fluorine.
11. The electrolyte composition according to claim 10 , wherein R3 and R4 are independently selected from the group consisting of fluorine, methyl, monofluoromethyl, difluoromethyl and trifluoromethyl.
12. The electrolyte composition according to claim 10 , wherein the compound has formula (I-1), (I-2), (I-3) or (I-4):