CAS:18925-64-9，Ethyl hexafluoroisopropyl carbonate ，（EHFPC）

The invention relates to a method for preparing a fluorine-containing straight-chain carbonic ester lithium battery additive by using imidazole as a catalyst. The use amount of imidazole accounts for 5-10% of the total amount of transesterification raw materials; the target products of the ester exchange reaction are methyl trifluoroethyl carbonate, ethyl trifluoroethyl carbonate, methyl hexafluoroisopropyl carbonate and ethyl hexafluoroisopropyl carbonate; the ester exchange reaction is carried out according to the following steps in sequence: a, adding ester and alcohol in a certain proportion into a three-neck flask provided with a thermometer and a mechanical stirring device; b, adding a proper amount of imidazole into the flask, and uniformly stirring and mixing; c, after the reaction is finished, collecting all reaction products and unreacted raw materials through reduced pressure distillation to obtain a mixture containing target product ester, and evaporating and cooling residual liquid to recover imidazole; and d, distilling and purifying the mixture containing the target product ester to obtain the high-purity target product ester. The catalyst can be separated and recycled through simple treatment, and the ester exchange reaction catalyzed by the catalyst is safe, simple and convenient.

Electrolytes and electrolyte additives for energy storage devices comprising fluorinated electrolyte additive compounds are disclosed. The energy storage device comprises a first electrode and a second electrode, where 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 at least one electrolyte additive selected from a linear carbonate, a cyclic carbonate, a linear carboxylic ester, a linear ether, a linear acetate, a sulfone, a linear anhydride, a cyclic anhydride, a phosphate, a phosphite, a phosphorus-containing compound, a phosphazene, a cyclic phosphazene, a nitrogen-containing compound, a silicon-containing compound, a sulfur-containing compound, a Li salt compound, a metal salt compound, fluorine salt compound, or combinations thereof, which may be partially or fully fluorinated and may be optionally substituted.