LDFOP 1,4-Dioxane Solvate for Moisture-Stable Electrolyte Salt Purification
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Solution Overview
Problem
Existing methods for preparing lithium difluorobis(oxalato)phosphate (LDFOP) result in products that are difficult to purify due to poor crystallinity, are prone to moisture absorption, and have low solubility in carbonate-based solvents, leading to increased costs and handling difficulties.
Innovation Solution
The formation of a 1,4-dioxane solvate with lithium difluorobis(oxalato)phosphate through a specific reaction process using methyltrichlorosilane or silicon tetrachloride, resulting in a crystalline form with improved crystallinity and filterability, allowing for high-purity production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If LDFOP is prepared in solid form by conventional separation methods, then purity is improved, but crystallinity and filterability deteriorate, making purification difficult
Solution Approach 1:
The invention changes the physical-chemical parameters of LDFOP by forming a solvate complex with 1,4-dioxane. This parameter change transforms the poor crystalline structure into a well-defined solvate crystal structure with characteristic diffraction peaks, thereby improving both crystallinity and filterability while maintaining high purity
Solution Approach 2:
The invention creates a composite material system by forming a solvate complex between LDFOP and 1,4-dioxane. The solvate structure combines the LDFOP molecules with solvent molecules in a specific ratio (0.5-2.0 equivalents), producing a new crystalline phase with superior processing properties including improved filterability and crystallinity
2Ease of operation
If LDFOP is stored in solid form, then handling is improved, but moisture absorption increases, reducing stability
Solution Approach 1:
The 1,4-dioxane solvate structure creates a more stable crystalline environment that is less susceptible to moisture ingress. The solvate crystal lattice provides better protection against moisture absorption compared to conventional solid LDFOP, thereby improving moisture stability while maintaining ease of handling
3Reliability
If LDFOP is stored in solution form, then stability against moisture is improved, but solubility in carbonate-based solvents is insufficient, increasing cost
Solution Approach 1:
The invention changes the physical state parameter from solution to solid solvate form. This parameter change enables LDFOP to be stored as a stable solid while achieving sufficient solubility in carbonate-based electrolyte solvents, thereby eliminating the need for continuous moisture exclusion and reducing storage costs
4Manufacturing precision
If reaction temperature and equivalent are carefully controlled, then by-products are reduced, but yield decreases and unreacted substances increase
Solution Approach 1:
The invention changes the reaction parameters by using silicon tetrachloride or methyltrichlorosilane as reagents and conducting the reaction in 1,4-dioxane solvent. This parameter change enables high-yield synthesis with minimal by-products, achieving both high manufacturing precision and high productivity simultaneously
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 1,4-dioxane solvate exhibits excellent stability against moisture, enabling easy handling, distribution, and storage, with a purity of 99.5% or more, and facilitates industrial-scale production.
Implementation Method 1
1,4-dioxane can form a solvate in a stable complex form through coordinate bond with lithium difluorobis(oxalato)phosphate
Implementation Method 2
1,4-dioxane solvate of lithium difluorobis(oxalato)phosphate having excellent stability against moisture
Data Source
AI summary
A 1,4-dioxane solvate of lithium difluoro bis(oxalato)phosphate, a method for preparing the same, and an electrolyte composition containing the same are disclosed. The 1,4-dioxane solvate of lithium difluorobis(oxalato)phosphate has excellent crystallinity and filterability, so that a compound with high purity can be obtained in high yield. Further, since it has excellent stability against moisture, its distribution and storage are easy and the stability of the composition containing 1,4-dioxane solvate of lithium difluoro bis(oxalato)phosphate can be greatly improved.