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Molybdenum disulfide (MoS2)-based cathodes have exhibited good electrochemical reactions in all phenyl complex (APC) electrolytes. However, APC electrolytes are highly corrosive and susceptible to oxidation. Alternatively, magnesium fluorinated alkoxyaluminate electrolyte (Mg[Al(HFIP)4]2) is a pioneering chloride-free electrolyte with remarkable electrochemical activity in rechargeable Mg batteries (RMBs). This study aims to investigate the compatibility of various MoS2 nanomaterials with Mg[Al(HFIP)4]2 in RMBs. Seven MoS2 nanomaterials were synthesized under different hydro/solvothermal conditions and evaluated as cathode materials in RMBs. The results revealed that the electrochemical activity of the as-synthesized MoS2 in RMBs significantly varied and MoS2 with high content of 1T-phase (M5) exhibited the best specific capacity of ca. 35 mAh g−1. Heteroatom doping, graphene oxide (GO) incorporation, and dual-salt electrolytes were employed to enhance the electrochemical performance of M5. The electrochemical tests showed that all doped-MoS2 and GO-MoS2 delivered poor specific capacities (< 20 mAh g−1), properly due to the disorder of the cathode material and the entrapment of Mg2+ ions. In contrast, dual-salt electrolytes (0.3 M Mg[Al(HFIP)4]2/0.3 M LiCl) improved the initial specific capacity by 242%. This is attributed to the preferential intercalation of Li+ ions that reduces the diffusion energy barrier and facilitates the intercalation of Mg+2 ions.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Rechargeable Mg battery; MoS2; Mg[Al(HFIP)4]2; Heteroatom doping; GO-MoS2 heterostructure; Li+/Mg2+ dual-salt electrolytes.

Date published: 2024-07-05

Publisher: Wiley

Journal:

• Batteries &amp; Supercaps (ISSN: 25666223) vol. 7 issue. 9 e202400231

Funding:

• Japan Science and Technology Agency JPMJPF2016
• Japan Science and Technology Agency JPMJGX23S1
• Ministry of Education, Culture, Sports, Science and Technology JPMXP0723833161
• Japan Society for the Promotion of Science JP21K05263
• Kyushu University

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/batt.202400231

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Updated at: 2024-10-10 08:30:55 +0900

Published on MDR: 2024-10-10 08:30:55 +0900