Macrocyclic Anion Receptor Electrolyte for Magnesium Battery Stability
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Solution Overview
Problem
Conventional magnesium batteries face challenges with chemical stability due to the formation of films on negative electrodes and the reactivity of Grignard-based magnesium salts with water and air, while conventional magnesium salts in non-aqueous organic solvents have low dissociation rates.
Innovation Solution
Incorporating macrocyclic anion receptors into the electrolytic solution, which form complexes with magnesium salts, enhancing their dissociation and chemical stability, thereby improving the performance of magnesium batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Grignard-based magnesium salt is used in the electrolytic solution, then the film formation on the negative electrode is prevented, but the chemical stability deteriorates due to reaction with water, oxygen, or carbon dioxide
Solution Approach 1:
The patent introduces an ether compound as an intermediary substance that mediates between the magnesium salt and the environment. The ether compound coordinates with the magnesium ion to form a stable complex, preventing direct reaction with water, oxygen, or carbon dioxide while maintaining electrochemical activity. This intermediary approach resolves the contradiction by providing both chemical stability and electrochemical functionality.
Solution Approach 2:
The electrolytic solution is designed as a composite system containing multiple components: magnesium salt, ether compound, and cyclic carbonate compound. This composite formulation combines the benefits of each component - the magnesium salt provides ionic conductivity, the ether compound ensures chemical stability through coordination, and the cyclic carbonate enhances overall performance. The synergistic interaction among components resolves the stability-reactivity contradiction.
2Stability of the object's composition
If a conventional magnesium salt is used in a non-aqueous organic solvent, then the chemical stability is improved, but the dissociation rate deteriorates
Solution Approach 1:
The patent optimizes the molecular structure parameters of the ether compound, specifically controlling the carbon chain length (C1-C10 alkyl groups) and the number of ether oxygen atoms. By adjusting these parameters, the solvent achieves optimal balance between chemical stability and dissociation capability. The modified ether structure enhances magnesium salt dissociation while maintaining chemical stability in the non-aqueous environment.
Solution Approach 2:
The electrolytic solution exhibits local quality differentiation through the use of mixed solvents with distinct functional regions. The ether compound provides local coordination sites for magnesium ion dissociation, while the cyclic carbonate compound provides local chemical stability. This spatial and functional differentiation allows simultaneous achievement of high dissociation rate and chemical 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 use of macrocyclic anion receptors increases the dissociation rate of magnesium salts, improving the chemical stability and reversibility of magnesium batteries, reducing impedance and enhancing ion conductivity.
Implementation Method 1
Incorporating macrocyclic anion receptors into the electrolytic solution, which form complexes with magnesium salts, enhancing their dissociation
Implementation Method 2
an electrolytic solution prepared by dissolving a magnesium salt in an organic solvent. The electrolytic solution contacts materials that comprise the positive electrode and the negative electrode
Data Source
AI summary
An electrolytic solution including: a magnesium salt; a non-aqueous organic solvent; and an anion receptor, wherein the anion receptor comprises at least one compound selected from the group consisting of compounds represented by Formulae 1 and 2 below:where A, m, p1, p2, p3, q1, RA, Ra, R1 through R6, and Ry are the same as described in the detailed description section.