Silicon-based energy storage devices with functionalized linear sulfonate ester derivative compound containing electrolyte additives
Electrolytes and electrolyte additives for energy storage devices comprising a sulfonate ester compound 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 a sulfonate ester compound.
1. A method of forming an energy storage device, the method comprising:
forming an energy storage device comprising a first electrode, an electrolyte, and a second electrode, wherein said electrolyte is formed by adding one or more sulfonate ester compounds as an electrolyte additive;
wherein the sulfonate ester compound is of formula (I):
where R 1 and R 2 are the same or different and are selected from the group consisting of H, alkyl, fluoro-alkyl, alkylene, alkoxy, alkenyl, alkenylene, alkynyl, alkynylene, cycloalkyl, cycloalkylene, aryl, arylene, heteroaryl, heteroalkyl, heteroalkylene and heterocycloalkylene, which may be optionally substituted.
2. The method of claim 1 , wherein the second electrode is a Si-dominant electrode.
3. The method of claim 1 , wherein the second electrode comprises a self-supporting composite material film.
4. The method 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 continuous phase that holds the composite material film together such that the silicon particles are distributed throughout the composite material film.
5. The method of claim 1 , wherein the electrolyte further comprises fluoroethylene carbonate (FEC).
6. The method of claim 5 , wherein the electrolyte is free of non-fluorine containing cyclic carbonate.