Silicon-based energy storage devices with carboxylic ether, carboxylic acid based salt, or acrylate electrolyte containing electrolyte additives
Electrolytes and electrolyte additives for energy storage devices comprising a carboxylic ether, a carboxylic acid based salt, or an acrylate electrolyte are disclosed. The energy storage device comprises 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 selected from carboxylic ethers, carboxylic acid based salts, and acrylates.
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
an electrolyte additive comprising a compound selected from Formula:
wherein:
R 3 is selected from the group consisting of alkenyl optionally substituted by alkyl or fluoro-alkyl;
A + is a cation selected from Na + and K + .
2. The energy storage device of claim 1 , wherein the second electrode is a Si dominant electrode where silicon is the majority of the active material used in the 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, acrylate acid salt, 3-butenoic acid-based salts, crotonic acid-based salts, 3-(trifluoromethyl)crotonic acid-based salts, trans-2-methyl-2-butenoic acid-based salts, and trans-2,3-dimethylacrylic acid-based salts.