Magnesium Electrolyte Composition for Higher Coulombic Efficiency
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Solution Overview
Problem
Magnesium-based electrochemical devices face challenges in achieving high coulombic efficiency at the negative electrode, limiting the efficient use and cycle characteristics of magnesium in charge and discharge cycles.
Innovation Solution
An electrolytic solution is developed using a linear ether solvent containing a magnesium salt with a disilazide structure and another magnesium salt without this structure, enhancing the coulombic efficiency and cycle characteristics of the negative electrode in magnesium electrode-based electrochemical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrolytic solution is used in magnesium electrode-based electrochemical devices, then the device can operate, but the coulombic efficiency of the negative electrode is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the electrolytic solution by introducing a specific linear ether solvent with particular molecular structure characteristics. This parameter change in the solvent type enables the magnesium electrode to achieve higher coulombic efficiency while maintaining good charge and discharge performance, directly resolving the contradiction between reliability and productivity
Solution Approach 2:
The patent creates a composite electrolytic solution system by combining the linear ether solvent with magnesium salts. This composite material approach allows the electrolyte to simultaneously provide high coulombic efficiency at the negative electrode and maintain overall device productivity, solving the efficiency contradiction through material composition optimization
2Quantity of substance
If more magnesium is initially loaded to improve capacity, then the device can achieve higher energy storage, but the device size increases
Solution Approach 1:
By changing the electrolytic solution parameters to use the specific linear ether solvent, the patent improves magnesium utilization efficiency. This allows the device to achieve the same energy storage capacity with less initial magnesium loading, thereby reducing device size while maintaining the required quantity of active material
Solution Approach 2:
The improved electrolytic solution enables more efficient self-utilization of magnesium during charge and discharge cycles. The magnesium electrode achieves better coulombic efficiency, meaning more of the loaded magnesium is effectively utilized, reducing the need for excess magnesium loading and thus smaller device volume
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 improves the charge and discharge efficiency of the negative electrode, reducing the initial magnesium load and enabling a smaller device size while maintaining preferred cycle characteristics of the positive electrode, thereby optimizing the use of magnesium in electrochemical devices.
Implementation Method 1
an electrolytic solution responsible for ion transport between the positive electrode and the negative electrode
Implementation Method 2
Magnesium generally has a large amount of electricity per unit volume that can be extracted by a redox reaction
Data Source
AI summary
An electrolytic solution for an electrochemical device including a magnesium electrode as a negative electrode is provided. The electrolytic solution includes a linear ether solvent. The linear ether solvent includes a first magnesium salt having a disilazide structure represented by a general formula (R3Si)2N where R represents a hydrocarbon radical with one or more and ten or less carbon atoms and a second magnesium salt without the disilazide structure.