Magnesium Compound Electrolyte for High Oxidation Potential
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Solution Overview
Problem
Magnesium batteries face limitations due to the low oxidation potential of their electrolyte solutions, which restricts the driving voltage and energy density, leading to potential decomposition of cathode active materials and instability at high voltages.
Innovation Solution
A magnesium compound represented by Formula 1, dissolvable in an ether solvent, is introduced, featuring electron withdrawing groups that enhance the oxidation potential of the electrolyte solution, allowing reversible dissolution and precipitation of magnesium, and is combined with a Lewis acid to stabilize the solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common electrolyte solution containing magnesium halide cations and organic anions is used, then the electrolyte solution can be prepared easily, but the oxidation potential remains very low which limits the driving voltage and energy density
Solution Approach 1:
The patent changes the chemical parameters of the electrolyte solution by replacing conventional magnesium halide cations with organometallic magnesium compounds containing electron-withdrawing groups. This parameter change increases the oxidation potential from very low levels to 2.70V or greater, enabling higher driving voltage and energy density while maintaining ease of preparation through dissolution in ether solvents
Solution Approach 2:
The patent creates a composite electrolyte solution by combining organometallic magnesium compounds with Lewis acids in ether solvents. This composite approach allows the solution to achieve both high oxidation potential (2.70V or greater) and improved electrochemical stability, resolving the contradiction between ease of manufacture and energy potential
2Use of energy by moving object
If the oxidation potential of the electrolyte solution is increased to improve energy density, then the driving voltage and energy density increase, but decomposition occurs on the cathode active material surface due to oxidation side reactions
Solution Approach 1:
The patent introduces Lewis acids as intermediary substances that mediate between the organometallic magnesium compounds and the cathode active material. The Lewis acids coordinate with the electrolyte components to form stable complexes, preventing direct oxidation reactions with the cathode material while maintaining the high oxidation potential (2.70V or greater) necessary for high energy density
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating electron-withdrawing groups on the magnesium compound and adding Lewis acids, which changes the redox characteristics of the electrolyte. This allows achieving oxidation potential of 2.70V or greater without causing decomposition, as the modified parameters prevent harmful side reactions
3Use of energy by moving object
If a cathode active material with high oxidation/reduction potential is used to increase energy density, then the energy density increases, but the electrolyte solution becomes unstable and decomposes
Solution Approach 1:
The patent uses Lewis acids as intermediary agents that stabilize the electrolyte solution when paired with high potential cathode materials. The Lewis acids form coordination complexes that prevent decomposition reactions, enabling the system to achieve high energy density through high oxidation/reduction potential cathodes while maintaining electrolyte stability
Solution Approach 2:
The patent creates a composite electrolyte system combining organometallic magnesium compounds with electron-withdrawing groups and Lewis acids. This composite structure provides both the high oxidation potential (2.70V or greater) needed for high energy density and the chemical stability required to prevent decomposition, resolving the contradiction between energy density and stability
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 increases the oxidation potential of the electrolyte solution to 2.70V or greater, enhancing the energy density and stability of magnesium batteries by preventing decomposition and improving electrochemical stability.
Implementation Method 1
a magnesium compound represented by Formula 1, wherein the magnesium compound is dissolvable in an ether solvent
Implementation Method 2
at least one of X2 and X3 each independently is an electron withdrawing group... increases the oxidation potential of an electrolyte solution
Implementation Method 3
is combined with a Lewis acid to stabilize the solution
Data Source
AI summary
A magnesium compound represented by Formula 1 wherein the magnesium compound is dissolvable in an ether solvent, an electrolyte solution for magnesium batteries that includes the magnesium compound and a magnesium battery including the electrolyte solution are provided:wherein, in Formula 1, X1 is a halogen atom; and at least one of X2 and X3 each independently is an electron withdrawing group, wherein, when X2 or X3 is not an electron withdrawing group, X2 or X3 is a hydrogen atom, a C1-C20 alkyl group, or a C6-C20 aryl group.