Novel method for preparing lithium bisfluorosulfonylimide

• Main Author: LIM, KWANG MIN
• Format: Patent
• Language: English; Korean
• Published: 21.03.2017
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; METALLURGY; ORGANIC CHEMISTRY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to a novel synthesis method of lithium bis(fluorosulfonyl)imide, and more specifically, to a synthesis method of lithium bis(fluorosulfonyl)imide capable of producing bis(fluorosulfonyl)imide, which is a lithium salt used in an electrolyte for lithium secondary batteries, in high yield and high purity. According to the novel synthesis method of lithium bis(fluorosulfonyl)imide of the present invention, a bis(chlorosulfonyl)imide compound, which is a starting material, is made to react with a fluoride reagent, and then without purification and concentration, immediately treated with an alkaline reagent, thereby overcoming the limitations of conventional methods to produce lithium bis(fluorosulfonyl)imide in high yield and high purity, conveniently and cost-effectively. 본 발명은 리튬 비스(플루오르술포닐)이미드의 신규한 제조방법에 관한 것으로, 보다 상세하게는 리튬 2차 전지용 전해액에 사용되는 리튬염인 리튬 비스(플루오르술포닐)이미드를 간단하고 경제적으로, 고수율 및 고순도로 제조할 수 있는 리튬 비스(플루오르술포닐)이미드의 제조방법에 관한 것이다. 본 발명에 따른 리튬 비스(플루오르술포닐)이미드의 신규한 제조방법은 출발물질인 비스(클로로술포닐)이미드화합물을 플루오르화 시약과 반응시킨 후, 정제나 농축없이 바로 알칼리 시약 처리함으로써, 상기 종래 기술의 문제점을 해결할 수 있으며, 간단하고 경제적으로 고수율 및 고순도의 리튬 비스(플루오르술포닐)이미드를 제조할 수 있는 효과가 있다.