Silicon-based energy storage devices with fluorinated cyclic compound containing electrolyte additives
Electrolytes and electrolyte additives for energy storage devices comprising fluorinated cyclic compounds.
1. An energy storage device comprising:
a first electrode and a second electrode, wherein at least one of the first electrode and the second electrode is a Si-based electrode;
a separator between the first electrode and the second electrode;
an electrolyte; and
at least one electrolyte additive comprising a compound selected from the group consisting of Formulae (A), (B), (C) and (G):
wherein:
each R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 is independently selected from the group consisting of —H, —F, and a C1-C8 alkyl substituted by F;
wherein, in Formula (A), at least one of R 1 , R 2 , R 3 or R 4 is —F or a C1-C8 alkyl substituted by F;
wherein, in Formula (B), at least one of R 1 or R 2 is —F or a C1-C8 alkyl substituted by F;
wherein, in Formula (C), at least one of R 1 , R 2 , R 3 , R 4 , R 5 or R 6 is —F or a C1-C8 alkyl substituted by F;
and
wherein, in Formula (G), each R 11 , R 12 , and R 13 is —H or a C1-C8 alkyl substituted by F, wherein at least one of R 11 , R 12 , or R 13 is a C1-C8 alkyl substituted by F.
2. The energy storage device of claim 1 , wherein the second electrode is a Si-dominant electrode.
3. The energy storage device of claim 1 , wherein the second electrode comprises a self-supporting composite material film.
4. The energy storage device of claim 3 , wherein the composite material film comprises:
greater than 0% and less than about 90% by weight of silicon particles, and
greater than 0% and less than about 90% by weight of one or more types of carbon phases, wherein at least one of the one or more types of carbon phases is a substantially continuous phase that holds the composite material film together such that the silicon particles are distributed throughout the composite material film.
5. The energy storage device of claim 1 , wherein the electrolyte further comprises fluoroethylene carbonate (FEC).
6. The energy storage device of claim 5 , wherein the electrolyte is substantially free of non-fluorine containing cyclic carbonate.
7. The energy storage device of claim 1 , wherein the electrolyte additive is selected from the group consisting of a fluorinated succinimide, a fluorinated glutarimide, a fluorinated maleimide, and a fluorinated 1-propanephosphonic acid cyclic anhydride.