Abstract: Electrolyte compositions for energy storage devices comprising fluorinated esters/carbonates/aromatic compounds and multiple additive combinations 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 composition comprising one or more of fluorinated ester/carbonate/aromatic compound solvents/co-solvents and multiple additive combinations.

Abstract: An electrolyte solution includes a solvent; an electrolyte salt; and a LA:LB complex represented by the following general formula I: [(FnA)x-L] (I) In formula I, A is boron or phosphorous, F is fluorine, L is an aprotic organic amine, n is 3 or 5, when n=3, A is boron, and when n=5, A is phosphorous, x is an integer from 1-3, and at least one N atom of the aprotic organic amine, L, is bonded directly to A. The LA:LB complex is present in the solution in an amount of between 0.01 and 5.0 wt. %, based on the total weight of the electrolyte solution.