4.7 Article

Unexpected discovery of magnesium-vanadium spinel oxide containing extractable Mg2+ as a high-capacity cathode material for magnesium ion batteries

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 405, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127005

Keywords

Magnesium ion battery; Mg-rich material; Spinel oxide cathode; Mg2+ extraction/insertion

Funding

  1. National Natural Science Foundation of China [51771071, 51972259]
  2. International Science & Technology Cooperation Program of China [2016YFE0124300]
  3. open fund of Collaborative Innovation Center of Green Light-weight Materials and Processing
  4. Hubei Provincial Key Laboratory of Green Materials for Light Industry [201710A05, 201611A07]
  5. Hubei provincial department of education [B 2019046]
  6. special funds for guiding local scientific and technological development by the central government of China [2019ZYYD015]

Ask authors/readers for more resources

Magnesium ion batteries (MIBs) are gaining significant attention as a promising candidate for the next generation energy storage system. The investigation of Mg(Mg0.5V1.5)O-4 as a potential cathode material has shown promising results in terms of fast reaction kinetics and superior performance, paving the way for the development and improvement of MIBs.
Magnesium ion batteries (MIBs) have attracted significant attention as a promising candidate for the next generation energy storage system owing to their large volumetric capacity and abundant resource. Currently, several researchers have focused on Mg-free materials to be used as cathode in MIBs; But the exploration of Mg-rich electrode materials will promote the development of magnesium batteries towards obtaining more flexible MIBs. Herein, a Mg(Mg0.5V1.5)O-4 is investigated as a potential cathode material, in which the Mg2+ can be extracted and the fast Mg2+ reaction kinetics. Benefited from the exceptional cathode, the Mg battery shows a high reversible specific capacity of 250 mA h g1 at 100 mA g(1) and capacity retention of 100 mA h g1 after 500 cycles at high rate of 1 A g(-1). The excellent rate capability and desirable cycling performance obtained herein outperformed those of previously reported magnesium spinel oxides. It is also demonstrated that Mg2+ extraction/insertion mechanism of Mg(Mg0.5V1.5)O-4 is related to the coexistence of two-phase process and single-phase solid solution reaction through a series of systematic in situ/ex situ characterizations. X-ray absorption near edge structure (XANES) demonstrates that the valence state of vanadium changes and the octahedral symmetry of vanadium site varies due to the extraction of Mg2+ from spinel Mg(Mg0.5V1.5)O-4. Significantly, the cathode containing extractable Mg2+ can be coupled with Mg-free anode materials (Na2Ti3O7) to assemble a full cell in Mg(TFSI)(2)/acetonitrile electrolyte, displaying a discharge capacity of 102 mA h g(-1) after 100 cycles at 50 mA g(-1). The encouraging results show that the Mg(Mg0.5V1.5)O-4 is a promising electrode material, which paves ways for the development and further improvements of MIBs.

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