Preparation method of bis(fluorosulfonyl)imide salt

The invention discloses a method for preparing bis(fluorosulfonyl)imide salt. The method comprises the following steps: reacting bis(chlorosulfonyl)imide and a fluorination reagent to obtain bis(fluorosulfonyl)imide; and reacting the bis(fluorosulfonyl)imide and an alkali metal salt chelator to obtain the corresponding bis(fluorosulfonyl)imide salt. The method provided by the invention does not need the use HF and other high-activity compounds, and is simple and safe in preparation process, thereby being suitable for industrialization application. 本发明公开了种制备双氟磺酰亚胺盐的方法，先使双氯磺酰亚胺和氟化试剂反应得到双氟磺酰亚胺，再使双氟磺酰亚胺和碱金属盐螯合剂应得到相应的双氟磺酰亚胺盐。本发明提供的方法不需要使用HF等高活性化合物，制备工艺简单且安全，适合工业化应用。