Lithium Difluorophosphate Synthesis With Phosphorus Reagents for Higher Yield
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Solution Overview
Problem
Existing methods for producing lithium difluorophosphate have limitations in achieving high yield.
Innovation Solution
A method involving the use of lithium hexafluorophosphate, an oxide of phosphorus, and a lithium salt of phosphoric acid in a hydrocarbon solvent, followed by solvent removal and reaction in a sealed system, utilizing specific stoichiometric ratios and purification solvents to enhance yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods (reacting lithium hexafluorophosphate with silicon dioxide or hexamethyldisiloxane) are used, then lithium difluorophosphate can be produced, but the yield is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by replacing silicon-based reagents (silicon dioxide, hexamethyldisiloxane) with phosphorus-based reagents (phosphorus oxoacid salts). This parameter change transforms the reaction pathway to produce lithium difluorophosphate with significantly improved yield while maintaining process feasibility
Solution Approach 2:
The patent introduces phosphorus oxoacid salts as intermediary compounds that facilitate the transformation of lithium hexafluorophosphate into lithium difluorophosphate. These intermediaries enable a more efficient reaction pathway compared to direct silicon-based methods, resolving the yield limitation
2Productivity
If lithium hexafluorophosphate reacts with phosphorus oxoacid salts in hydrocarbon solvent, then high yield of lithium difluorophosphate is achieved, but solvent removal and purification steps are required
Solution Approach 1:
The patent performs preliminary solvent removal before the reaction reaches completion, concentrating the reactants and facilitating easier purification. This preliminary action simplifies subsequent processing steps while maintaining high yield by preventing solvent interference with the reaction equilibrium
Solution Approach 2:
The patent extracts and removes the hydrocarbon solvent from the reaction mixture at an appropriate stage, separating it from the solid lithium difluorophosphate product. This extraction step simplifies the overall process by eliminating the need for complex solvent recovery systems while preserving product yield
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
The method achieves a high yield of lithium difluorophosphate, improving its production efficiency and purity.
Implementation Method 1
a step of producing a crude product containing lithium difluorophosphate by reacting the second raw material mixture, wherein the step of producing the crude product is a step of producing the crude product by reacting lithium hexafluorophosphate with at least one selected from the group consisting of an oxide of phosphorus (A) and a lithium salt of phosphoric acid (B)
Implementation Method 2
a step of obtaining a first raw material mixture by mixing lithium hexafluorophosphate, at least one selected from the group consisting of an oxide of phosphorus (A) and a lithium salt of phosphoric acid (B), and a hydrocarbon solvent having from 6 to 12 carbon atoms
Implementation Method 3
a step of obtaining a solution by dissolving the crude product in a purification solvent; and a step of extracting lithium difluorophosphate from the solution
Data Source
AI summary
A method of producing lithium difluorophosphate, the method including: a step of obtaining a first raw material mixture by mixing lithium hexafluorophosphate, at least one selected from the group consisting of an oxide of phosphorus (A) and a lithium salt of a phosphoric acid (B), and a hydrocarbon solvent having from 6 to 12 carbon atoms; a step of obtaining a second raw material mixture by removing at least a part of the hydrocarbon solvent contained in the obtained first raw material mixture; and a step of producing a crude product containing lithium difluorophosphate by reacting the second raw material mixture.