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Enhancing Energy Conversion Efficiency and Suppression of Side Reactions in Li-O2 Batteries through a Magnetic Field
Hang Li1, Kang Shen1, Jianli Zhang1
1College of Material Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
None:
Enhancing the energy conversion efficiency of lithium-oxygen batteries remains a significant challenge. Side reactions and slow transfers of Li+, O2, and electrons cause the accumulation of insoluble byproducts on the cathode, leading to high discharge overpotentials and limited reversibility. In this study, the authors introduce a magnetic field to address these issues. Applying an external magnetic field to ferromagnetic catalysts significantly reduces the overpotential to only 0.57 V at 200 mA/g, while maintaining exceptional rate performance and cycle stability. In-situ characterization experiments demonstrate effective suppression of byproducts, primarily Li2CO3. Theoretical calculations further reveal that the magnetic field stabilizes highly reactive singlet oxygen within the battery system, inhibiting the byproduct formation pathways. Furthermore, the magnetic field plays a crucial role in promoting the decomposition of discharge products and Li+ mass transfer. Together, these effects minimize polarization and improve energy transfer efficiency, offering a versatile strategy for advanced metal-air batteries.
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