Silicon-based energy storage devices with anhydride containing electrolyte additives
Electrolytes and electrolyte additives for energy storage devices comprising an anhydride 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 an anhydride compound.
1. An energy storage device comprising:
a first electrode and a second electrode, wherein one or both 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 trifluoroperacetic anhydride.
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 90% by weight of silicon particles, and
greater than 0% and less than 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 free of non-fluorine containing cyclic carbonate.