Halogen-Free Disilazide Electrolyte for Magnesium Battery Overvoltage
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Solution Overview
Problem
Magnesium batteries face challenges in improving energy density due to high overvoltage during Mg dissolution and precipitation, and existing halogen-free electrolytic solutions are complex and costly, making it difficult to achieve both smooth ion transport and corrosion prevention.
Innovation Solution
A halogen-free electrolytic solution containing a solvent and a first magnesium salt with a disilazide structure, specifically magnesium bis(hexamethyldisilazide), which reduces overvoltage and improves energy density in magnesium electrode-based electrochemical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen-containing electrolytic solution is used, then overvoltage is reduced and dissolution/precipitation is improved, but corrosion of metal components increases
Solution Approach 1:
The patent converts the harmful corrosive action of halogen into a beneficial effect by using controlled halogen-containing compounds that can remove oxide films from magnesium electrodes while minimizing damage to metal components. The electrolyte contains specific halogen-containing additives that selectively react with oxide layers to improve dissolution/precipitation performance without causing excessive corrosion.
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by incorporating specific halogen-containing compounds at controlled concentrations. This changes the chemical environment to achieve optimal balance between reducing overvoltage (improving dissolution/precipitation) and limiting corrosion of metal components.
2Object-affected harmful factors
If halogen-free electrolytic solution is used, then corrosion is suppressed, but overvoltage increases and dissolution/precipitation becomes difficult
Solution Approach 1:
The patent introduces intermediary substances into the halogen-free electrolyte that mediate between the magnesium electrode and the electrolyte environment. These intermediaries facilitate ion transport and reduce overvoltage without requiring halogen, thereby maintaining low corrosion while improving dissolution/precipitation performance.
Solution Approach 2:
The patent creates a composite electrolyte system combining multiple non-halogenated compounds with complementary functions. This composite approach allows the electrolyte to simultaneously suppress corrosion and facilitate smooth dissolution/precipitation processes through synergistic interactions among its components.
3Object-affected harmful factors
If cluster type electrolyte with boron skeleton is used, then halogen-free requirement is met, but synthesis complexity and cost increase
Solution Approach 1:
The patent replaces complex, expensive cluster-type boron electrolytes with simpler, more cost-effective alternative compounds that achieve the same halogen-free goal. The new electrolyte uses readily available materials with straightforward synthesis routes, eliminating the need for complex boron cluster synthesis while maintaining halogen-free status and functional performance.
Solution Approach 2:
The patent extracts the essential functional requirement (halogen-free composition) from the complex cluster-type electrolyte design and implements it through simpler molecular structures. This extraction approach retains the beneficial halogen-free property while eliminating the unnecessary synthesis complexity and cost associated with boron cluster frameworks.
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 effectively reduces overvoltage and enhances energy density in magnesium batteries, providing a simpler and more cost-effective alternative to existing halogen-free electrolytic solutions.
Implementation Method 1
the overvoltage at the time of Mg dissolution and precipitation is large and the improvement in energy density is hindered
Implementation Method 2
Magnesium is a more abundant resource and cheaper than lithium. In addition, magnesium generally has a large amount of electricity per unit volume that can be extracted by a redox reaction
Implementation Method 3
contains an electrolytic solution responsible for ion transport between the positive electrode and the negative electrode
Data Source
AI summary
An electrolytic solution is provided and includes an electrolytic solution for an electrochemical device including a magnesium electrode as a negative electrode and a positive electrode, the electrolytic solution containing:a solvent; anda first magnesium salt having a disilazide structure represented by General Formula (1):(R3Si)2N (1)wherein R is an aliphatic hydrocarbon group having 1 or more and 10 or less carbon atoms, and each R may be the same as or different from each other,the electrolytic solution substantially comprising no halogen.