Ultrafast Synthesis of Oxygen Vacancy-Rich MgFeSiO4 Cathode to Boost Diffusion Kinetics for Rechargeable Magnesium-Ion Batteries

作者：Jie Xu, Yuqi Hong, Shuming Dou, Junhan Wu, Jingchao Zhang, Qingmeng Wang, Tiantian Wen, Yang Song, Wei‐Di Liu, Jianrong Zeng, Guangsheng Huang, Chaohe Xu, Yanan Chen, Jili Yue, Jingfeng Wang, Fusheng Pan · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.4c04908 · 被引用次数：16 · 研究领域：Advancements in Battery Materials、Magnesium Oxide Properties and Applications、Advanced Battery Materials and Technologies

Rechargeable magnesium ion batteries (RMBs) have drawn extensive attention due to their high theoretical volumetric capacity and low safety hazards. However, divalent Mg ions suffer sluggish mobility in cathodes owing to the high charge density and slow insertion/extraction kinetics. Herein, it is shown that an ultrafast nonequilibrium high-temperature shock (HTS) method with a high heating/quenching rate can instantly introduce oxygen vacancies into the olivine-structured MgFeSiO 4 cathode (MgFeSiO 4 -HTS) in seconds. As a proof of concept, the MgFeSiO 4 -HTS exhibits a higher electrochemical property and fast insertion/extraction kinetics in comparison to those prepared from the conventional sintering method. The MgFeSiO 4 -HTS displays remarkable long-term cycling lifespan properties with a reversible capacity of 85.65 and 54.43 mAh g –1 over 500 and 1600 cycles at 2 and 5 C, respectively. Additionally, by combining the electrochemical experiments and density functional theory calculations, oxygen vacancies can weaken the interaction and energy barrier between the Mg 2+ ions and the cathode, enhancing the Mg 2+ diffusion kinetics.