Synthesis of Ethylene Glycol bis(propionitrile)Ether as a Functional Additive for Lithium-Ion Battery Electrolyte
This paper presents an efficient synthesis method of ethylene glycol bis(propionitrile)ether,which is obtained by one-step reaction of ethylene glycol and acrylonitrile under the action of Di-(trimethylsilyl)amine lithium(20％tetrahydrofuran solution)as catalyst.The reaction conditions are mild,the temperature is controlled at about 30 ℃.After the reaction,the pH is adjusted to about 6 with dilute sulfuric acid,and then the unreacted acrylonitrile,tetrahydrofuran and a small amount of water are removed by vacuum distillation.After high vacuum rectification,ethylene glycol(dipropanitrile)ether with purity greater than 99.9％can be obtained.The molar yield of the method is more than 90％(in glycol terms),and the molar yield can reach 95％after of the intermediate mono-ether was recycled and applied to reaction.This synthesis technology can not only meet the application requirements of high quality lithium-ion battery electrolyte additives,but also can be used in large-scale industrial production.
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