CAS:288148-57-2，Carbonic acid, 2-methoxyethyl 2,2,2-trifluoroethyl ester

The invention belongs to the technical field of batteries, and particularly relates to diatom-substituted carbonate-based electrolyte containing alkoxy and fluorine atoms as well as a preparation method and application of the diatom-substituted carbonate-based electrolyte. The electrolyte comprises a diatom-substituted carbonate solvent, a lithium salt and an additive, wherein the molecular structure of the diatom-substituted carbonate solvent contains alkoxy and fluorine atom substituents. The electrolyte has a high boiling point and a high flash point, the high-temperature performance of the battery can be improved, the self-extinguishing time of the electrolyte is shortened, and the safety of the battery is improved; the negative electrode has good compatibility with a traditional graphite negative electrode, solvent co-intercalation does not occur, and it is guaranteed that the lithium ion battery has excellent cycling stability; the lithium-ion battery electrolyte has excellent interface stability with metal lithium, the dissolution-deposition efficiency of the metal lithium can be greatly improved, and the cycle life of a lithium metal battery is prolonged. The electrolyte has good oxidation stability and can be matched with a high-voltage positive electrode. The diatom-substituted carbonic ester-based electrolyte has a good application prospect in the fields of lithium ion batteries and lithium metal batteries.

PROBLEM TO BE SOLVED: To heighten mobility of ions of an electrolyte salt, and lower reactivity with lithium in either case of a room temperature and a high temperature by containing one or more kinds of ether linkage-containing monocarbonate compound as an organic solvent for dissolving the electrolyte of a non-aqueous electrolyte. SOLUTION: One or more kinds of ether linkage-containing monocarbonate compounds expressed by the formula: R1-R2-OC(=O)O-R3=R4 are contained in an organic solvent. For example, cited are methyl-1-methoxymethyl carbonate, methyl-1-tetrahydrofurfuryl carbonate and the like. By using this non-aqueous electrolyte, charging-discharging cycle characteristics and high temperature characteristics of a non-aqueous electrolytic secondary battery are improved. In the formula, R1 and R2 are H, halogen, (halogen substitutional) alkoxy group with C1-8 or an ether-linkage containing annular substitutional group, one of them is an alkoxy group or an annular substitutional group, and R2 and R3 are halogen substitutional alkylene group with C1-8.