Magnetic Electrocatalysts Enabling a High‐Rate Capability in Lithium‐Oxygen Batteries

Lithium‐oxygen batteries hold substantial promise for high‐energy‐density applications owing to their exceptional theoretical energy capacity. Nevertheless, the slow kinetics and pronounced capacity degradation significantly lead to inferior power density and cycle life, limiting the practical implementation of lithium‐oxygen batteries. This study introduces an innovative magnetic field‐assisted Li‐O 2 battery system using zinc‐iron oxide nanoparticles as bifunctional electrocatalysts with tunable magnetic properties. By tuning the Zn/Fe ratio, zinc‐iron oxide nanoparticles with controllable saturation magnetization ( M s ) are obtained, thereby generating localized magnetic fields that effectively enhance electrochemical reaction kinetics under a magnetic field. In addition, the magnetic catalysts facilitate faster electron transfer and improve lithium (Li + ) ion diffusion under the external magnetic field through a unique spin‐alignment mechanism. Remarkably, this approach achieves a high specific capacity of 4555 mAh g −1 at current rates up to 2000 mA g −1 , surpassing the performance of conventional lithium‐oxygen batteries. Density functional theory calculations further reveal that the external magnetic field promotes selective spin alignment in the zinc‐iron oxides, improving the decomposition of oxygen‐related intermediates and enhancing catalytic efficiency. This work pioneers a non‐invasive method for improving lithium‐oxygen battery performance by leveraging an external magnetic field, opening new directions for high‐rate Li‐O 2 batteries through magnetic field‐assisted catalysis.