oxidation-reduction catalyst for metal-air battery, air electrode for metal-air battery including the same, membrane-electrode assembly for metal-air battery

Manufacture of anti-deterioration lithium-air batteries

This technology relates to an oxidation-reduction catalyst for a metal-air battery, an air electrode, and a membrane-electrode assembly for a metal-air battery including the same.

Lithium-air batteries have an energy density that is more than 10 times higher than existing lithium batteries, making them promising as next-generation secondary batteries. However, there is a problem in that current density and lifespan characteristics deteriorate when lithium oxide (Li2O2) accumulates through repeated charging and discharging. To solve this problem, this technology proposes a method to reduce the permeation of redox mediator (RM) through the separation membrane.

This technology can not only improve the performance of metal-air batteries by reducing the permeation of redox mediators through the separator during charging and discharging, but also prevent the crossover phenomenon of redox mediators.

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Key Features:

• The oxidation-reduction catalyst for a metal-air battery is a binder and a redox mediator
• The first gel electrolyte is a fluorine-based polymer, a lithium precursor, and an ionic liquid
• The second gel electrolyte is a fluorine-based polymer, a lithium precursor, an ionic liquid, and an additive
• Hexagonal boron nitride, aluminum oxide (Al2O3), Carbon nanotubes (CNT) and silicon oxide (SiO2) are used as additives

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This technology was developed through support from the National Research Foundation of Korea's research project for a high current density water electrolysis system using a lithium ion exchange membrane.

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