Eutectic Electrolyte for Thermal Stability
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Solution Overview
Problem
Existing non-aqueous electrolytes used in electrochemical devices suffer from low viscosity, volatility, flammability, and reduced durability and stability, while ionic liquids can deteriorate battery performance by reducing lithium ions at higher voltages.
Innovation Solution
A eutectic mixture composed of an alkoxy alkyl group-containing amide compound and an ionizable lithium salt, which provides high thermal and chemical stability and a smaller electrochemical window, enhancing the stability of electrochemical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-aqueous electrolytes using organic solvents are used, then the electrolyte shows good electrochemical performance, but the electrolyte exhibits easy leakage, strong volatility, and strong flammability
Solution Approach 1:
The patent changes the chemical composition parameters by using eutectic mixtures of lithium salt and amide compounds instead of conventional organic solvents. This parameter change eliminates the harmful properties of organic solvents (leakage, volatility, flammability) while maintaining electrochemical performance through the synergistic effects of the eutectic mixture components.
Solution Approach 2:
The patent employs composite materials by creating eutectic mixtures composed of multiple components (lithium salts and amide compounds). This composite approach combines the advantages of different materials to achieve both safety (reducing flammability and volatility) and electrochemical performance, resolving the contradiction between reliability and harmful factors.
2Reliability
If eutectic mixture of lithium salt and amide compound is used, then the electrolyte exhibits high thermal and chemical stability, but the electrochemical window lowest limit needs to be reduced for better performance
Solution Approach 1:
The patent uses parameter changes by adjusting the composition ratios of lithium salts and amide compounds in the eutectic mixture. By optimizing these parameters, the patent achieves both high thermal/chemical stability and an appropriate electrochemical window, enabling the electrolyte to function effectively across a wider range of electrochemical conditions.
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 eutectic mixture significantly improves thermal stability, reduces evaporation and ignition issues, and maintains electrochemical performance across various temperatures, making it suitable for diverse electrochemical applications.
Implementation Method 1
an electrolyte, which includes a eutectic mixture composed of (a) an alkoxy alkyl group-containing amide compound expressed by the following chemistry formula 1 or 2; and (b) an ionizable lithium salt
Data Source
AI summary
An electrolyte includes a eutectic mixture comprising (a) an alkoxy alkyl group-containing amide compound having a specific chemistry formula 1 or 2:wherein each of X, R, R1, R2, m and n is defined;and (b) an ionizable lithium salt. The eutectic mixture-containing electrolyte exhibits excellent high temperature stability as well as inherent characteristics of eutectic mixtures, including excellent thermal and chemical stability, thus contributing to improved high temperature stability and decreased lowest limit of electrochemical window. The electrolyte is useful in electrochemical devices comprising various anode materials.