Metal free nanoporous graphene enables development of high performance all solid state magnesium air rechargeable batteries

University of Tsukuba researchers develop a magnesium-air battery using nitrogen-doped graphene that outperforms platinum-based systems and offers high flexibility.

By: AXL Media

Published: Mar 4, 2026, 9:17 AM EST

Source: The information in this article was sourced from University of Tsukuba

Advancements in magnesium air battery technology

The global shift toward electrification has created an urgent demand for high-capacity rechargeable batteries that do not rely on expensive and scarce materials like lithium or platinum. Magnesium-air batteries have emerged as a promising solution, utilizing a magnesium-metal anode and atmospheric oxygen as the active material at the cathode. While the theoretical performance of these systems is comparable to lithium-air batteries, they have traditionally suffered from degradation issues. Specifically, the chloride ions used in the electrolytes often cause internal chlorination, which reduces the battery's lifespan and overall efficiency. A new study from the University of Tsukuba addresses these limitations through the introduction of advanced carbon-based materials.

Innovative nitrogen doped graphene cathode

The research team, led by Professor Yoshikazu Ito, fabricated a specialized cathode using nitrogen-doped porous graphene. This material was engineered to possess strong resistance to chloride attack, preventing the degradation typically seen in magnesium-based systems. Unlike traditional cathodes that require precious metal catalysts, this graphene-based architecture is entirely metal-free. The nitrogen doping enhances the material's catalytic activity, while its nanoporous structure provides a high surface area that efficiently accommodates discharge products. This design ensures that the battery can sustain repeated charge-discharge cycles without a significant loss in performance.

All solid state architecture and safety

To further improve the battery's stability and safety, the researchers transitioned from a liquid electrolyte to an all-solid-state design. The battery utilizes a polymer gel infused with magnesium chloride as the solid electrolyte, paired with a commercially available magnesium-metal anode. This solidification eliminates the risk of electrolyte leakage, which is a common failure point in traditional liquid-based batteries. The move to a solid-state system not only improves the chemical stability of the magnesium interface but also simplifies the battery's construction, making it a more viable candidate for mass production in the electric vehicle sector.