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Electron-injection-engineering induced dual-phase MoO2.8F0.2/MoO2.4F0.6 heterostructure for magnesium storage.

ABSTRACT: Rechargeable magnesium batteries (RMBs) have received increased attention due to their high volumetric capacity and safety. Nevertheless, the sluggish diffusion kinetics of highly polarized Mg2+ in host lattices severely hinders the development of RMBs. Herein, we report an electron injection strategy for modulating the Mo 4d-orbital splitting manner and first fabricate a dual-phase MoO2.8F0.2/MoO2.4F0.6 heterostructure to accelerate Mg2+ diffusion. The electron injection strategy triggers weak Jahn-Teller distortion in MoO6 octahedra and reorganization of the Mo 4d-orbital, leading to a partial phase transition from orthorhombic phase MoO2.8F0.2 to cubic phase MoO2.4F0.6. As a result, the designed heterostructure generates a built-in electric field, simultaneously improving its electronic conductivity and ionic diffusivity by at least one order of magnitude compared to MoO2.8F0.2 and MoO2.4F0.6. Importantly, the assembled MoO2.8F0.2/MoO2.4F0.6//Mg full cell exhibits a remarkable reversible capacity of 172.5 mAh g-1 at 0.1 A g-1, pushing forward the orbital-scale manipulation for high-performance RMBs.

SUBMITTER: Wang W 

PROVIDER: S-EPMC11312365 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature

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Electron-injection-engineering induced dual-phase MoO<sub>2.8</sub>F<sub>0.2</sub>/MoO<sub>2.4</sub>F<sub>0.6</sub> heterostructure for magnesium storage.

Wang Weixiao W   Xiong Fangyu F   Zhu Shaohua S   Yan Mengyu M   Liao Xiaobin X   Yu Kesong K   Cui Lianmeng L   Chen Jinghui J   Wang Junjun J   Lan Ruoqi R   Xie Jun J   An Qinyou Q   Mai Liqiang L  

National science review 20240711 8

Rechargeable magnesium batteries (RMBs) have received increased attention due to their high volumetric capacity and safety. Nevertheless, the sluggish diffusion kinetics of highly polarized Mg<sup>2+</sup> in host lattices severely hinders the development of RMBs. Herein, we report an electron injection strategy for modulating the Mo 4d-orbital splitting manner and first fabricate a dual-phase MoO<sub>2.8</sub>F<sub>0.2</sub>/MoO<sub>2.4</sub>F<sub>0.6</sub> heterostructure to accelerate Mg<sup>  ...[more]

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