Magnesium Secondary Battery Electrolyte Using Organoaluminum Ate Complex
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Solution Overview
Problem
Magnesium secondary batteries face challenges with low coulombic efficiency due to the strong interaction between divalent magnesium ions and solvents in non-aqueous electrolyte solutions, limiting the deposition and dissolution of magnesium metal.
Innovation Solution
A non-aqueous electrolyte solution comprising a non-aqueous solvent, a magnesium salt, and an organoaluminum ate complex salt, which enables uniform distribution of magnesium ions on electrodes, promoting deposition and dissolution, and improving charge-discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-aqueous electrolyte solution containing a magnesium salt and cyclic acid anhydride is used, then the battery structure is established, but the coulombic efficiency remains low due to strong interaction between magnesium ions and solvent
Solution Approach 1:
The patent introduces an organoaluminum ate complex salt as an intermediary substance in the electrolyte solution. This complex acts as a mediator that weakens the strong interaction between divalent magnesium ions and the non-aqueous solvent, thereby improving coulombic efficiency. The organoaluminum ate complex salt specifically coordinates with magnesium ions to form a stable complex that reduces solvent binding strength, enabling better charge-discharge performance.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte solution by incorporating an organoaluminum ate complex salt with specific structural characteristics (formula (1) with alkyl groups or alkyl groups with functional groups). This parameter change in the electrolyte composition fundamentally alters the interaction dynamics between magnesium ions and solvent molecules, transforming the system from high interaction/low efficiency to low interaction/high efficiency.
2Productivity
If conventional non-aqueous electrolyte solutions are used, then the battery can operate, but the deposition and dissolution of magnesium metal are difficult due to strong solvent interaction
Solution Approach 1:
The organoaluminum ate complex salt serves as a intermediary that facilitates magnesium metal deposition and dissolution. By coordinating with magnesium ions, it creates a favorable interface for electron transfer and ion exchange, enabling efficient charge-discharge cycles that were previously difficult to achieve with conventional electrolyte solutions.
3Reliability
If existing magnesium secondary batteries use non-aqueous electrolyte solution with glyme, then the battery structure is formed, but the coulombic efficiency is low
Solution Approach 1:
The patent creates a composite electrolyte system by combining glyme (non-aqueous solvent), magnesium salt, and organoaluminum ate complex salt in specific proportions. This composite electrolyte composition leverages the solvating ability of glyme while the organoaluminum ate complex salt component addresses the strong interaction problem, achieving high coulombic efficiency through synergistic material combination.
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 the organoaluminum ate complex salt enhances magnesium ion conductivity and electrochemical stability, leading to improved charge-discharge efficiency and increased solubility of magnesium salts, thereby addressing the limitations of existing magnesium secondary batteries.
Implementation Method 1
an organoaluminum ate complex salt which enables uniform distribution of magnesium ions on a surface of electrodes
Implementation Method 2
uniform distribution of magnesium ions on a surface of electrodes
Implementation Method 3
non-aqueous electrolyte solution includes a non-aqueous solvent, a magnesium salt, and an organoaluminum ate complex salt
Data Source
AI summary
A non-aqueous electrolyte solution for a magnesium secondary battery includes a non-aqueous solvent, a magnesium salt, and an organoaluminum ate complex salt represented by formula (1) below. In formula (1), R1, R2, R3, and R4 are each independently (i) an alkyl group or (ii) an alkyl group with a functional group.