Disulfonylamide Salt Granule Crystallization for Low Residual Solvent
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Solution Overview
Problem
Existing methods for producing di(sulfonylamide) salts result in high impurity content, particularly residual solvents, which can deteriorate cell characteristics in secondary cells.
Innovation Solution
A method involving a crystallization step where an ester-based solvent solution containing a compound of formula [I] is added to a halogenated hydrocarbon-based solvent, achieving granules with a modal diameter of 5 µm to 80 µm, a median diameter of 5 µm to 45 µm, and a residual solvent concentration of 1500 ppm or less, ensuring a low impurity content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filtration methods are used to separate crystals, then production efficiency is maintained, but the concentration of residual solvent remains high causing cell characteristic deterioration
Solution Approach 1:
The patent changes the particle size parameters of the granules (modal diameter 5-80 μm, median diameter 5-45 μm) to optimize the balance between solvent removal efficiency and dissolution performance. This parameter optimization allows achieving low residual solvent concentration (1500 ppm or less) while maintaining good dissolution characteristics
Solution Approach 2:
The patent extracts and removes residual solvent from the granules through controlled crystallization and filtration processes, achieving solvent concentration of 1500 ppm or less. This extraction process eliminates the harmful factor without compromising the essential properties of the di(sulfonylamide) salt granules
2Speed
If granule size is reduced to improve dissolution speed, then dissolution efficiency increases, but production complexity and filtration difficulty increase
Solution Approach 1:
The patent optimizes granule size parameters (modal diameter 5-80 μm, median diameter 5-45 μm) to achieve the best balance between dissolution speed and production feasibility. This parameter range ensures quick and uniform dissolution while maintaining manageable production complexity
Solution Approach 2:
The patent creates granules with a specific size distribution pattern (modal diameter to median diameter ratio) that dynamically optimizes dissolution behavior. The granules are designed to dissolve quickly and uniformly without requiring overly complex production equipment or processes
3Ease of manufacture
If granule size is increased to simplify production, then manufacturing ease improves, but dissolution uniformity and speed decrease
Solution Approach 1:
The patent establishes specific granule size parameters (modal diameter 5-80 μm, median diameter 5-45 μm, with modal diameter to median diameter ratio of 0.2-1.8) that simultaneously achieve easy manufacture and uniform dissolution. These parameter ranges are optimized to balance production simplicity with dissolution performance
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 produces granules that quickly and uniformly dissolve, enhancing the efficiency of electrolytic solution manufacturing and reducing the risk of cell characteristic deterioration due to low impurity content, particularly solvents and metal ions.
Implementation Method 1
a crystallization step in which an ester-based solvent solution containing a compound of formula [I] is added to a halogenated hydrocarbon-based solvent
Data Source
AI summary
Granules or powders consisting of a compound of formula [I], in which a modal diameter is 80 µm or less, a median diameter is 45 µm or less, and/or, a ratio of (modal diameter) / (median diameter) is 1.7 or less, are preferably used for an electrolyte or the like. In formula [I], R1 and R2 each independently represents a fluoroalkyl group having 1 to 6 carbon atoms, or a fluorine atom, and Y+ represents an alkali metal cation or an ammonium cation.