Method for preparing imidodisulfuryl fluoride lithium

A technology of lithium bisfluorosulfonyl imide and bisfluorosulfonyl imide, which is applied in the field of preparation of lithium bisfluorosulfonyl imide, can solve problems such as high risk, high difficulty in operation, corrosion of equipment, etc., and achieve high product quality , The effect of low raw material price and easy removal
CN107662908AInactive Publication Date: 2018-02-06JIANGSU LEE & MAN CHEM +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JIANGSU LEE & MAN CHEM
Publication Date
2018-02-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for preparing imidodisulfuryl fluoride lithium. The method comprises the following steps: (1) reacting imidodisulfuryl fluoride with antimony trifluoride under a solvent free condition, and distilling to obtain imidodisulfuryl fluoride lithium intermediate; (2) reacting metal lithium with anhydrate low alcohol, and concentrating and drying to obtain anhydrate low alcohol lithium; and (3) reacting the imidodisulfuryl fluoride lithium with lithium alkoxide, concentrating, pulping, filtering and drying to obtain a high-purity imidodisulfuryl fluoride lithium product. The method for preparing the imidodisulfuryl fluoride lithium has the characteristics of low cost, high purity and simple operation, and is suitable for industrial production.
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Description

technical field

[0001] The invention relates to a lithium battery electrolyte additive, in particular to a preparation method of lithium bisfluorosulfonyl imide. Background technique

[0002] Lithium bisfluorosulfonyl imide (Li[N(SO 2 F) 2 ], hereinafter referred to as LiFSI), is a very important lithium battery electrolyte additive, which has the advantages of high electrical conductivity, good thermal stability, high electrochemical stability, good cycle performance, and good safety performance. Compared with a wide range of LiPF6, it has many excellent properties, and is a better choice for lithium battery electrolytes.

[0003] In the prior art, the preparation methods of lithium bisfluorosulfonyl imide mainly contain the following types:

[0004] Chinese patent CN103524387A has reported that bischlorosulfonimide (HClSI) reacts with lithium chloride in thionyl chloride to generate bischlorosulfonimide lithium (LiClSI), and then utilizes metal fluoride (KF, ZnF 2 etc....

Claims

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