Fe-doping accelerated magnesium storage kinetics in rutile TiO2 cathode materials

Qianwei Zhang, Xin Liu, Changliang Du, Mingwei Jin, Lifen Yang, Rong Jiang, Xilan Ma, Youqi Zhu*, Chuanbao Cao, Meishuai Zou

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

摘要

Rutile titanium dioxide (TiO2) is theoretically favored as the efficient cathode materials for magnesium secondary batteries, yet rarely reported due to sluggish kinetics, low capacity, and inferior reversibility. Herein, a defect engineering strategy is developed via cationic Fe-doping to enhance the electrochemical magnesium storage kinetics of the rutile TiO2 cathode materials and achieve the surface Mg2+ adsorption/diffusion mechanism. Abundant oxygen vacancies can be generated by Fe cations in rutile TiO2 via a molten salt flux method. The optimized rutile TiO2 cathode materials show large specific capacity of 204.8 mAh/g at current density of 100 mA g−1, higher than that of the TiO2-based counterparts reported previously. Additionally, the Mg2+ diffusion coefficient of Fe-doped rutile TiO2 cathode materials are significantly improved to enable rapid magnesium storage. Fe cations can activate the cathode surface and weaken the Coulombic interactions between Mg2+ and anions in the host material. Oxygen vacancies can provide active adsorption sites for Mg2+ and MgCl+ to avoid slow solid-state diffusion and thus accelerate magnesium storage kinetics. Ex-situ XRD and XPS indicate that Fe-doped rutile TiO2 cathode materials undergo the energy storage mechanism of Mg2+ adsorption/diffusion without phase transition or significant lattice expansion.

源语言英语
文章编号155812
期刊Chemical Engineering Journal
498
DOI
出版状态已出版 - 15 10月 2024

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