Non-Aqueous Electrolyte Purification Using Weak-Base Anion Resin
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Solution Overview
Problem
Existing methods for removing acidic impurities like hydrogen fluoride from non-aqueous electrolytic solutions used in lithium-ion batteries are ineffective due to quaternization reactions that modify the anion exchange resin, leading to non-selective adsorption of other components.
Innovation Solution
An apparatus and method utilizing a weakly basic anion exchange resin with a styrene-based substrate and a tertiary amino group, specifically designed to pass an alkali metal salt electrolyte-containing solution through an ion exchange unit, effectively removing acidic impurities while preventing quaternization reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a weakly basic anion exchange resin is used to remove acidic impurities from non-aqueous electrolytic solution, then acidic impurity removal capability is improved, but the resin undergoes quaternization reaction that modifies the tertiary amino group, leading to non-selective adsorption of other components
Solution Approach 1:
The patent changes the chemical structure parameters of the anion exchange resin by specifying a quaternary ammonium group with a specific structure (where R1-R6 are specific hydrocarbon groups) instead of a tertiary amino group. This structural parameter change prevents the quaternization reaction while maintaining anion exchange capability, thereby resolving the contradiction between acidic impurity removal and selective adsorption performance.
2Quantity of substance
If the anion exchange resin undergoes quaternization reaction, then adsorptive properties are improved, but it becomes difficult to selectively remove acidic impurities
Solution Approach 1:
The patent specifies precise structural parameters for the quaternary ammonium group (with R1-R6 being specific hydrocarbon groups having 1-6 carbon atoms) to optimize the balance between adsorptive capacity and selectivity. By controlling these structural parameters, the resin achieves sufficient adsorptive capacity while maintaining high selectivity for acidic impurities over other components like LiPF6.
3Ease of manufacture
If conventional anion exchange resin is used, then purification treatment can be performed, but target quality of electrolytic solution cannot be achieved due to non-selective adsorption
Solution Approach 1:
The patent changes the functional group parameter from tertiary amino to quaternary ammonium with specific hydrocarbon substituents (R1-R6). This parameter change enables the resin to maintain stable chemical properties during purification treatment while achieving the target quality of electrolytic solution by selectively removing acidic impurities without non-selective adsorption of other components.
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 solution enables easy purification of non-aqueous electrolytic solutions by effectively removing acidic impurities like hydrogen fluoride, thereby maintaining the quality of the electrolytic solution for lithium-ion batteries.
Implementation Method 1
an ion exchange unit accommodating a weakly basic anion exchange resin through which an alkali metal salt electrolyte-containing solution having the alkali metal salt electrolyte dispersed in an carbonate ester is passed to obtain the non-aqueous electrolytic solution
Implementation Method 2
a method of bringing an electrolytic solution for a lithium ion battery into contact with a weakly basic anion exchange resin that contains an anion exchange group having a tertiary amine structure (tertiary amino group)
Data Source
AI summary
Provided is an apparatus for producing a non-aqueous electrolytic solution capable of easily performing purification treatment by removal of acidic impurities such as hydrogen fluoride contained in a non-aqueous electrolytic solution.The apparatus for producing a non-aqueous electrolytic solution comprises an ion exchange unit accommodating a weakly basic anion exchange resin through which an alkali metal salt electrolyte-containing solution having the alkali metal salt electrolyte dispersed in an carbonate ester is passed to obtain the non-aqueous electrolytic solution, wherein the weakly basic anion exchange resin has a styrene-based resin as substrate and an amino group as weakly basic anion exchange group.