Preparation method of ethyl methyl carbonate solution containing ethylene sulfate

Abstract

The invention discloses a preparation method of a methyl ethyl carbonate solution containing ethylene sulfate, and relates to improvement of a preparation method of a lithium ion battery electrolyte, in particular to improvement of the preparation method of the methyl ethyl carbonate solution containing the ethylene sulfate. The technical scheme adopted by the invention comprises the following steps: adding ethylene sulfite, methyl ethyl carbonate and a trace amount of ruthenium trichloride aqueous solution into a reaction kettle, and uniformly conducting stirring at low temperature; and S2, dropwise adding a hypochlorite aqueous solution into the reaction kettle at low temperature to obtain a methyl ethyl carbonate crude product solution of ethylene sulfate, carrying out low-temperature water washing and liquid separation on the ethyl methyl carbonate crude product solution of ethylene sulfate for multiple times, and adding a dehydrating agent into the organic phase after water washing and liquid separation, and conducting drying to obtain a methyl ethyl carbonate solution finished product. According to the invention, the problems of low packaging efficiency, easy caking during storage, inconvenient use and the like of the ethylene sulfate solid product are solved, and the use convenience of the ethylene sulfate as the lithium ion battery electrolyte additive can be obviously improved.

Description

technical field [0001] The invention relates to an improvement of a method for preparing an electrolyte of a lithium ion battery, in particular to an improvement of a method for preparing an ethyl methyl carbonate solution containing vinyl sulfate. Background technique [0002] Vinyl sulfate is an excellent electrolyte additive material for lithium-ion batteries. Since the central sulfur atom of vinyl sulfate is more electronegative, the reducibility at the graphite negative electrode interface is stronger than that of the corresponding carbonate, so a more stable solid electrolyte phase interface film (SEI film) is preferentially formed at the electrode interface at the initial stage of charging, It is used to prevent lithium ions from reacting with carbon negative electrodes or other substances during charging and discharging, thereby inhibiting the decline in the initial capacity of lithium-ion batteries, increasing the initial discharge capacity, reducing the expansion o...

AI Technical Summary

Problems solved by technology

The packaging of vinyl sulfate solid finished products is very inconvenient. Accurate weighing and measurement is labor-intensive, the efficiency is very low, and there is a risk of exposure. First, it may cause environmental dust pollution, which is not conducive to occupational health and hygiene. Second, it may lead to the introduction of foreign matter in the packaging process

During the storage process of solid packaging, there will also be agglomeration, which will cause inconvenience in use

When the user uses vinyl sulfate to configure the electrolyte, the solid feeding also has problems such as difficult accurate measurement and inconvenient operation.