Non-Aqueous Electrolyte Purification for Moisture and HF Removal
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Solution Overview
Problem
Existing methods for producing non-aqueous electrolytic solutions fail to effectively remove moisture and acidic impurities like hydrogen fluoride, leading to battery degradation and performance issues due to residual sodium ions from zeolite ion exchange.
Innovation Solution
An apparatus comprising a moisture adsorption apparatus with zeolite, an electrolyte addition apparatus, and an acid adsorption apparatus with a weakly basic anion exchange resin, which sequentially treats the organic non-aqueous solvent to reduce moisture and acidic impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If zeolite is used to remove moisture from the electrolytic solution, then moisture content is reduced, but sodium ions elute into the solution as impurities
Solution Approach 1:
The invention divides the purification process into two separate stages: first using zeolite to remove moisture from the solvent, then using an ion exchange resin to remove sodium ions from the electrolyte solution. This segmentation allows each material to perform its specific function without interference, preventing sodium ion elution into the final electrolytic solution.
Solution Approach 2:
The invention introduces an ion exchange resin as an intermediary substance between the zeolite moisture removal step and the final electrolytic solution. This intermediary captures the sodium ions that would otherwise elute into the solution, allowing the zeolite to effectively remove moisture without contaminating the final product with sodium ions.
2Device complexity
If moisture is not removed from the electrolytic solution, then the production process is simpler, but acidic impurities like hydrogen fluoride increase causing battery degradation
Solution Approach 1:
The invention performs moisture removal from the solvent as a preliminary action before adding the lithium salt electrolyte. By removing moisture in advance, the subsequent ion exchange step can effectively remove acidic impurities without the interference of moisture, ensuring high purity of the final electrolytic solution.
Solution Approach 2:
The invention implements a continuous purification process where the treated solvent is immediately used to prepare the electrolytic solution, which then passes through the ion exchange resin. This continuous action ensures that moisture and acidic impurities are systematically removed throughout the production process, preventing battery degradation.
3Quantity of substance
If sodium ions remain in the zeolite, then ion exchange with lithium ions occurs, but this causes sodium ions to elute into the electrolytic solution as impurities
Solution Approach 1:
The invention extracts the sodium ion removal function from the zeolite moisture removal process and places it in a separate ion exchange resin step. This extraction allows the zeolite to focus on moisture removal while the ion exchange resin specifically targets and removes sodium ions from the electrolyte solution.
Solution Approach 2:
The ion exchange resin serves as an intermediary that captures sodium ions between the zeolite moisture removal step and the final electrolytic solution formulation. This intermediary prevents sodium ions from eluting into the final product while allowing lithium ions to be properly incorporated into the electrolyte.
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 apparatus efficiently produces a non-aqueous electrolytic solution with reduced moisture and impurities, preventing sodium ion mixing and hydrogen fluoride content, thereby enhancing battery performance.
Implementation Method 1
a moisture adsorption apparatus accommodating zeolite through which an organic non-aqueous solvent passes
Implementation Method 2
an acid adsorption apparatus accommodating a weakly basic anion exchange resin through which an alkali metal salt electrolyte-containing solution obtained by the electrolyte addition apparatus passes
Data Source
AI summary
The apparatus for producing a non-aqueous electrolytic solution includes: a moisture adsorption apparatus accommodating zeolite through which an organic non-aqueous solvent passes, an electrolyte addition apparatus for adding an alkali metal salt electrolyte to the organic non-aqueous solvent treated by the moisture adsorption apparatus, and an acid adsorption apparatus accommodating a weakly basic anion exchange resin through which an alkali metal salt electrolyte-containing solution obtained by the electrolyte addition apparatus passes.