Si-N-Si Ring Magnesium Salt Electrolyte for Battery Stability
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Solution Overview
Problem
Conventional magnesium battery electrolyte solutions with Grignard-based magnesium salts are electrochemically unstable, leading to reduced lifespan due to cation presence and film formation on the negative electrode, which hampers the reversibility between magnesium deposition and dissolution.
Innovation Solution
A non-aqueous organic solvent-based electrolyte solution containing a magnesium salt with a Si—N—Si ring-type non-nucleophilic structure, which maintains chemical reactivity while being electrochemically stable, and includes a Lewis acid to widen the oxidation potential range, enhancing reversibility and preventing film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a Grignard-based magnesium salt is used in the electrolyte solution, then film formation on the negative electrode is prevented, but electrochemical stability deteriorates due to cation presence
Solution Approach 1:
The patent changes the chemical structure parameters of the magnesium salt by introducing a Si-N-Si ring-type non-nucleophilic structure with specific substituents (CY1, CY2 rings and R1-R23 groups). This structural modification allows the electrolyte to maintain chemical reactivity while achieving electrochemical stability, resolving the contradiction between preventing film formation and ensuring stability.
Solution Approach 2:
The patent creates a composite electrolyte system by combining the specially structured magnesium salt (Formula 1) with a Lewis acid. This composite approach widens the oxidation potential range and enhances both electrochemical stability and reversibility, addressing the stability issue while maintaining the beneficial properties of Grignard-based salts.
2Productivity
If conventional electrolyte solutions are used, then magnesium deposition and dissolution can occur, but reversibility deteriorates and lifespan is reduced
Solution Approach 1:
The patent modifies the oxidation potential parameters of the electrolyte solution by incorporating a Lewis acid with the magnesium salt. This parameter change widens the oxidation potential range, which directly improves the reversibility of magnesium deposition and dissolution reactions, thereby extending battery lifespan through enhanced reaction efficiency.
3Reliability
If electrochemical stability is improved, then lifespan characteristics are enhanced, but chemical reactivity may be reduced
Solution Approach 1:
The patent carefully designs the magnesium salt structure (Formula 1) with specific ring systems (CY1, CY2) and substituent groups (R1-R23) to optimize the balance between electrochemical stability and chemical reactivity. The Si-N-Si ring structure provides stability while the可调 substituents maintain necessary reactivity for battery operation.
Solution Approach 2:
By combining the structurally optimized magnesium salt with a Lewis acid, the patent creates a composite electrolyte that synergistically enhances electrochemical stability while preserving chemical reactivity through the widened oxidation potential range.
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 electrolyte solution improves the lifespan characteristics of magnesium batteries by increasing the reversibility between magnesium deposition and dissolution, maintaining stability and preventing film formation on the negative electrode, thus extending battery life.
Implementation Method 1
an electrolyte solution including a non-aqueous organic solvent and a magnesium salt
Implementation Method 2
increasing reversibility between deposition and dissolution of magnesium
Data Source
AI summary
An electrolyte solution including a non-aqueous organic solvent and a magnesium salt represented by Formula 1:wherein in Formula 1, groups CY1, CY2, A1 to A10, and variable n are defined in the specification.