Preparation method of lithium battery electrolyte

• Main Authors: WENG YEQIN, XIE WENJIAN, YUE GONGXING, SHI ZHENG
• Format: Patent
• Language: Chinese; English
• Published: 14.08.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a preparation method of a lithium battery electrolyte. The preparation method comprises the following steps: S1, selecting an appropriate chlorination initiating system to synthesize and prepare monochloroethylene carbonate with relatively high purity; S2, using the monochloroethylene carbonate and a fluorinated reagent with high compatibility to carry out a fluoridation reaction, and after obtaining fluoro ethylene carbonate, carrying out rectification, ion column separation and molecular sieve purification in sequence; S3, carrying out an electrochemical reduction reaction on the fluoro ethylene carbonate on the surface of a graphite cathode, and forming an SEI film with relatively high thickness and relatively large impedance to obtain a product A; S4, taking themonochloroethylene carbonate as a raw material and triethylamine as an antichlor, synthesizing vinylene carbonate, and carrying out rectification, ion column separation and molecular sieve purification in sequence; and S5, c