Magnetic Field-Driven Catalysis: Revealing Enhanced Oxygen Reactions in Li-O₂ Batteries Using Tailored Magnetic...

Lithium-oxygen (Li-O₂) batteries offer immense promise for next-generation energy storage technology due to their ultra-high theoretical energy density. However, their adoption faces challenges like large overpotential and slow oxygen reaction kinetics. This study introduces a novel strategy that leverages custom-designed magnetic nanocatalysts and external magnetic fields to boost electrochemical performance. Mn-Co-Fe oxide catalysts with adjustable magnetic properties is developed and demonstrated the correlation between the magnetism of the catalysts and the enhancement of battery performance. In the presence of an external magnetic field, the paramagnetic oxygen molecules experience a Kelvin force, while the Li⁺ ions are influenced by a Lorentz force. This accelerates their diffusion, significantly enhancing the kinetics of both the oxygen reduction and oxygen evolution reactions. The catalyst with the highest magnetization boosted specific capacity by 52.9% (from 8143 to 12 455 mAh g⁻¹) and significantly lowered the overpotential. This breakthrough underscores magnetic field-driven catalysis as a crucial advancement in unlocking the full potential of Li-O₂ batteries, setting new benchmarks for energy storage technology.