Fluorosulfonyl Imide Salt Drying With Low-Temperature Solvent Removal
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Solution Overview
Problem
The challenge lies in efficiently removing reaction solvents and reducing water content in fluorosulfonyl imide salts, as high solvent content increases production costs and water leads to device corrosion and voltage deterioration, while heating for solvent removal decreases yield.
Innovation Solution
The method involves concentrating the alkali metal salt of fluorosulfonyl imide by bubbling a gas into the reaction solution and/or using thin film distillation to rapidly remove solvents without high-temperature heating, followed by drying at low temperatures to minimize impurity content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If heating is applied to remove solvent and water from fluorosulfonyl imide salt, then solvent and water content is reduced, but the yield decreases due to decomposition
Solution Approach 1:
The patent changes the parameter of temperature from high-temperature heating to low-temperature concentration (below decomposition point), combined with pH adjustment to prevent decomposition during concentration, thereby maintaining high yield while removing solvent and water
Solution Approach 2:
The patent performs preliminary pH adjustment to an acidic range (pH 1-3) before concentration to suppress decomposition of fluorosulfonyl imide salt during the concentration process, ensuring high yield is maintained while achieving solvent and water removal
2Quantity of substance
If conventional concentration methods are used, then solvent removal is achieved, but production costs increase due to loss of product
Solution Approach 1:
The patent changes the concentration temperature to below the decomposition point of fluorosulfonyl imide salt and controls pH to acidic range, enabling solvent removal without product loss, thereby reducing production costs while achieving the desired solvent content reduction
3Device complexity
If fluorosulfonyl imide salt is produced with high solvent content, then production process is simpler, but electrochemical device performance deteriorates
Solution Approach 1:
The patent applies simple pH adjustment to acidic range followed by low-temperature concentration to achieve solvent removal, maintaining production process simplicity while significantly improving voltage endurance by reducing solvent and water content in the final product
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in an alkali metal salt of fluorosulfonyl imide with enhanced heat resistance and reduced impurities, maintaining stable electrochemical properties over a wide temperature range.
Implementation Method 1
concentrating a solution of an alkali metal salt of fluorosulfonyl imide while bubbling a gas into a reaction solution containing the alkali metal salt of fluorosulfonyl imide
Implementation Method 2
concentrating the reaction solution containing the alkali metal salt of fluorosulfonyl imide by thin film distillation
Data Source
Figure 1
AI summary
The present invention provides an alkali metal salt of fluorosulfonyl imide represented by the following general formula (1) and having a content of sulfate ions of 3,000 ppm by mass or less, a content of potassium ions of 10,000 ppm by mass or less, and a content of fluoride ions of 1,000 ppm by mass or less.