METHOD FOR PRODUCING BIS(FLUOROSULFONYL)IMIDE LITHIUM SALT (LIFSI) WITH REDUCED FLUORINE ANION CONTENT BY USING ALKOXY TRIALKYL SILANE

The present invention provides a method for producing a bis(fluorosulfonyl)imide lithium salt, the method comprising the steps of: (a) reacting bis(chlorosulfonyl)imide with NH4F(HF)n (n=0-10) to prepare ammonium bis(fluorosulfonyl)imide; and (b) reacting the ammonium bis(fluorosulfonyl)imide with a lithium base, wherein in at least one of steps (a) and (b), after the reaction, a process of adding an alkoxy trialkyl silane to the reaction solution to remove a fluorine anion is performed. La présente invention concerne une méthode de production d'un sel de lithium bis(fluorosulfonyl)imide, la méthode comprenant les étapes consistant à : (a) faire réagir du bis(chlorosulfonyl)imide avec du NH4F(HF)n (n=0-10) pour préparer du bis(fluorosulfonyl)imide d'amonium ; et (b) faire réagir le bis(fluorosulfonyl)imide d'ammonium avec une base de lithium, dans au moins une des étapes (a) et (b), après la réaction, un procédé d'ajout d'un alcoxy trialkyl silane à la solution de réaction pour éliminer un anion fluor est effectué. 본 발명은 (a) 비스(클로로술포닐)이미드를 NH4F(HF)n(n=0~10)와 반응시켜서 암모늄 비스(플루오르술포닐)이미드를 제조하는 단계; 및 (b) 상기 암모늄 비스(플루오르술포닐)이미드를 리튬 염기와 반응시키는 단계;를 포함하며, 상기 (a)단계 및 (b)단계 중의 어느 한 단계 이상에서, 반응 후, 반응용액에 알콕시트리알킬실란을 첨가하여 불소음이온을 제거하는 공정을 수행하는 것을 특징으로 하는 비스(플루오르술포닐)이미드 리튬염의 제조방법을 제공한다.