Preparation method for difluorosulfonylimide salt

Abstract

The invention belongs to the technical field of preparation of electrolyte salts used for electrochemical devices, and specifically relates to a preparation method with advantages of safe reaction process, simple operation method, high product production capacity, simple post-treatment, applicability to large-scale production and capability of obtaining high-purity difluorosulfonylimide salt meeting the use requirements of electronic chemicals. The preparation method comprises the following steps: (1) introducing dichlorosulfonylimide and fluorine-containing gas into a micro-channel reactor, and carrying out a reaction at 36 to 120 DEG C for 60 to 600 s so as to obtain difluorosulfonylimide; (2) adding the obtained difluorosulfonylimide and an oxide of alkali metal or an oxide of alkaline-earth metal into an organic solvent, and carrying out a reaction at minus 20 to 10 DEG C for 1 to 12 h so as to obtain the difluorosulfonylimide salt.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrolyte salts for electrochemical devices, and in particular relates to a preparation method of difluorosulfonimide salt. Background technique [0002] Since 2014, the country's strong support for new energy vehicles has promoted the explosive growth of the industry, but at present there is still a bottleneck in the most critical power battery technology that is contradictory between energy storage density and safety, and it is urgent to develop new high-performance materials to break through the predicament. The development of core electrolyte salts for electrolytes is one of the key links. In recent research and evaluation, difluorosulfonimide salts are considered to have high conductivity and high thermal stability, and are very suitable for high-power, high-low temperature and other power batteries. application environment. [0003] There have been many reports on the synthesis me...

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Problems solved by technology

[0002] Since 2014, the country's strong support for new energy vehicles has promoted the explosive growth of the industry, but at present there is still a bottleneck in the most critical power battery technology that is contradictory between energy storage density and safety, and it is urgent to develop new high-performance Materials to break through

However, the use of thionyl chloride to remove water will produce a large amount of SO by-product 2 and HCl, so that the tail gas absorption treatment becomes a great environmental protection burden, and the recrystallization method needs to be carried out many times to obtain high-purity products, which will cause large product losses

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