Magnesium Battery Electrolyte Additives for High Capacity
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Solution Overview
Problem
The existing nonaqueous electrolytic solutions for magnesium batteries face challenges such as low oxidation decomposition potential, instability of raw materials, and complex manufacturing processes, which hinder the commercialization of magnesium batteries and limit their capacity and safety.
Innovation Solution
A nonaqueous electrolytic solution containing magnesium ions, where metal magnesium, alkyl trifluoromethanesulfonate, and quaternary ammonium or 1,3-alkyl methylimidazolium salts are added to an ether system organic solvent, along with aluminum halides and trifluoroborane-ether complexes, to enhance the electrochemical performance and stability of magnesium batteries, allowing for manufacturing in a general environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing nonaqueous electrolytic solutions are used for magnesium batteries, then the battery can operate, but the oxidation decomposition potential is low and stability is poor
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolytic solution by introducing specific additives (lithium halide, aluminum halide, and their complexes) to existing nonaqueous electrolytic solutions. This modifies the oxidation decomposition potential and stability characteristics, resolving the contradiction between operability and stability.
Solution Approach 2:
The patent creates composite electrolytic solutions by combining multiple components: base nonaqueous electrolyte, lithium halide additive, aluminum halide additive, and their complexes. This composite approach enhances both the oxidation decomposition potential and stability while maintaining battery operability.
2Reliability
If complex manufacturing processes are used, then electrochemical performance can be improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functional components (electrolyte solvent, lithium halide, aluminum halide, and their complexes) into a single integrated electrolytic solution formulation. This merging approach achieves enhanced electrochemical performance while simplifying the manufacturing process, as all components are mixed together in one step rather than requiring separate complex processing stages.
3Quantity of substance
If battery size is increased to improve capacity, then energy storage increases, but device size increases
Solution Approach 1:
The patent changes the electrochemical parameters of the electrolytic solution by adding lithium halide and aluminum halide complexes, which significantly enhance the discharge capacity of magnesium batteries. This allows achieving high energy storage density without increasing battery size, as the improvement comes from enhanced electrochemical efficiency rather than increased physical dimensions.
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
This solution significantly increases the discharge capacity of magnesium batteries, enabling them to reach up to 99% of theoretical capacity without increasing battery size, while ensuring stability and safety, and can be manufactured in a dry room environment, making them more viable for commercial use.
Implementation Method 1
A metal which is easy to emit an electron to become a cation, that is, a metal having a large ionization tendency is given as a material suitable for a negative-electrode active material
Implementation Method 2
metal magnesium and the magnesium ions are very promising materials as the electrode active material in the electrochemical device, and the electric charge carriers in the electrolytic solution, respectively
Implementation Method 3
aluminum halides and trifluoroborane-ether complexes, to enhance the electrochemical performance and stability
Data Source
AI summary
A Mg battery has a positive-electrode can, a positive-electrode pellet made of a positive-electrode active material or the like, a positive electrode composed of a metallic net supporting body, a negative-electrode cup, a negative electrode made of a negative-electrode active material, and a separator impregnated with an electrolytic solution and disposed between the positive-electrode pellet and the negative-electrode active material. By adopting a structure that copper contacts the positive-electrode active material, the electrochemical device can be given a large discharge capacity.