A kind of method for preparing pentafluorophenyl methanesulfonate at low cost

Abstract

The invention discloses a method for preparing pentafluorophenyl methanesulfonate. The method comprises the following steps: dissolving pentafluorophenol in an organic solvent, and then adding an acidbinding agent to form a mixed solution; dropwise adding an organic mixed solution containing methanesulfonic anhydride and an acyl chlorination reagent to the solution, and carrying out a reaction toobtain crude pentafluorophenyl methanesulfonate; and purifying and drying then the crude pentafluorophenyl methanesulfonate to obtain the finished pentafluorophenyl methanesulfonate. The use danger of highly toxic chemicals is avoided, and the sulfonating reagent methanesulfonic anhydride is a white crystalline solid, and is convenient to transpor and store; the acyl chlorination reagent added inthe reaction improves the reaction activity and the yield, so the cost is reduced; and additionally, the purification process is simple, and extraction using ice water is used to reduce the hydrolysis of the sulfonate, so the yield is increased.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a low-cost method for preparing pentafluorophenyl methanesulfonate. Background technique [0002] At present, research on new electrolyte additives for silicon-carbon anodes has become a hot spot. Fluoroethylene carbonate (FEC) is an excellent additive that can well form an SEI film on the surface of the negative electrode, prevent the embedding of solvent molecules in the graphite negative electrode, and protect the negative electrode material. However, with the increase in energy density requirements, silicon-carbon anode materials with high specific energy density have developed rapidly, and silicon has a large volume expansion rate during charge and discharge, which makes the formed SEI film rupture, resulting in continuous consumption of FEC. Pentafluorophenyl methanesulfonate (shown in chemical formula (1)) has a higher reduction potential than FEC, and can preferentially ...

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Problems solved by technology

[0006] However, this method has the following disadvantages: firstly, methanesulfonyl chloride is a flammable liquid and is a highly toxic chemical, which has many safety hazards during transportation, use and storage; secondly, the reactivity of methanesulfonyl chloride is too high. High, it is difficult to control in the reaction, and it is easy to cause danger; third, it is easy to introduce chloride ions in the reaction process, and chloride ions are very harmful to lithium-ion batteries, and the purification cost is relatively high

However, due to the large molecular weight of methanesulfonic anhydride, the reaction molar ratio with pentafluorophenol is 1:1, and the price is relatively expensive, making the cost of industrialization very high

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