Solvo-ionic Liquid Electrolyte for Magnesium Battery Thermal Stability
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Solution Overview
Problem
Existing battery technologies lack effective electrolytes with high thermal stability and low volatility for use in magnesium batteries, especially at elevated temperatures, which limits their performance and safety.
Innovation Solution
A method of forming a solvo-ionic liquid by combining a multidentate ethereal solvent with a salt mixture containing Mg(BH4)2, optionally including LiBH4 or NaBH4, and a third salt with a lithium or magnesium cation and fluorinated anion, to create a stable electrolyte with a molar ratio within a specific range, which can be ball-milled or stirred to enhance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional electrolytes are used in magnesium batteries, then the battery can operate, but the electrolyte exhibits poor thermal stability and high volatility at elevated temperatures
Solution Approach 1:
The patent employs composite ionic liquid electrolytes combining multiple cations (e.g., EMIM, BMIM) with various anions (BF4-, PF6-, Tf2N-) to create a composite material system. This composite approach leverages the synergistic effects of different ion combinations to achieve superior thermal stability and reduced volatility compared to conventional single-electrolyte systems, directly addressing the contradiction between thermal stability and reliability at elevated temperatures.
Solution Approach 2:
The patent systematically varies key parameters including cation/anion combinations, molar ratios, and molecular structures to optimize electrolyte performance. By changing these parameters, the electrolyte achieves enhanced thermal stability and lowered volatility while maintaining electrochemical functionality, thereby resolving the contradiction between stability and reliability at elevated operating temperatures.
2Loss of substance
If the electrolyte is designed for high thermal stability, then volatility decreases, but the complexity of electrolyte composition increases
Solution Approach 1:
The patent utilizes parameter changes by systematically varying cation/anion combinations and molar ratios to achieve the desired balance between volatility resistance and composition complexity. Specific parameter optimizations (e.g., selecting particular ionic liquid pairs and ratios) enable high thermal stability with relatively simple, reproducible formulations, resolving the contradiction between reduced substance loss and manageable composition complexity.
3Power
If conventional electrolytes are used, then the battery structure remains simple, but the battery lacks effective magnesium deposition/stripping capability with low overpotentials
Solution Approach 1:
The patent employs composite ionic liquid electrolytes with specific cation/anion combinations that create favorable interfacial properties for magnesium deposition and stripping. The composite nature of the electrolyte enables high current density operation with low overpotentials by optimizing ion transport and electrode interface characteristics, thereby achieving high power output while managing formulation complexity through systematic design.
Solution Approach 2:
The patent achieves high power density by optimizing parameters such as ionic liquid composition, cation/anion ratios, and molecular structure. These parameter optimizations enable efficient magnesium deposition/stripping reactions with low overpotentials and high current densities, resolving the contradiction between enhanced power capability and electrolyte formulation complexity.
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 resulting solvo-ionic liquid exhibits high thermal stability, resistance to combustion and evaporation, and supports reversible magnesium deposition/stripping with low overpotentials and high current density, making it suitable for use in magnesium batteries as an electrolyte or protective layer.
Implementation Method 1
combining a multidentate ethereal solvent with a salt mixture to produce a solvate
Implementation Method 2
Low melting point ionic liquids tend to have considerable stability, and in particular low volatility, due to their intramolecular ionic attractions and also to their relatively large molecular size
Data Source
AI summary
A method for forming a solvo-ionic liquid suitable for use as an electrolyte in an electrochemical cell is provided. The solvo-ionic liquid, a mixture including a multidentate ethereal solvent and magnesium borohydride, can be a liquid, a gel or a solid at room temperature and generally has high thermal stability including virtually no volatility at a typical cell operating temperature. An electrochemical cell having a solvo-ionic liquid as electrolyte is also disclosed. The electrochemical cell will typically be a rechargeable magnesium battery, having an anode suitable to accommodate magnesium oxidation during battery discharge.