US 11,987,496 B2
Method for producing bis(fluorosulfonyl)imide lithium salt (LiFSI) with reduced fluorine anion content by using alkoxy trialkyl silane
Sang Ryul Lee, Chungju-si (KR); Kyoung Chol Kim, Chungju-si (KR); Ja Young Park, Chungju-si (KR); Ji Hyeong Kim, Chungju-si (KR); Jeong In Kim, Chungju-si (KR); Seok Ju Lee, Daegu (KR); Jongyun Jang, Uiseong-gun (KR); Seongjeong Lee, Daegu (KR); Mingi Chu, Daegu (KR); and Dong Wook Kang, Seoul (KR)
Assigned to DAEGU CATHOLIC UNIVERSITY INDUSTRY ACADEMIC COOPERATION FOUNDATION, Gyeongsan-si (KR)
Appl. No. 17/274,539
Filed by DAEGU CATHOLIC UNIVERSITY INDUSTRY ACADEMIC COOPERATION FOUNDATION, Gyeongsan-si (KR)
PCT Filed Sep. 4, 2019, PCT No. PCT/KR2019/011415
§ 371(c)(1), (2) Date Mar. 9, 2021,
PCT Pub. No. WO2020/055033, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 10-2018-0108231 (KR), filed on Sep. 11, 2018.
Prior Publication US 2021/0347639 A1, Nov. 11, 2021
Int. Cl. C01B 21/086 (2006.01); C01B 21/093 (2006.01)
CPC C01B 21/086 (2013.01) [C01B 21/093 (2013.01)] 8 Claims
 
1. A method for producing a bis(fluorosulfonyl)imide lithium salt, comprising the steps of:
(a) reacting bis(chlorosulfonyl)imide with NH4F(HF)n (n=0-10) to prepare ammonium bis(fluorosulfonyl)imide;
(b) reacting the ammonium bis(fluorosulfonyl)imide with a lithium base, following by a first concentration process to give a first concentrate comprising a fluorine anion (F−); and
(c) adding an alkoxy trialkyl silane to the first concentrate to remove or reduce the fluorine anion.