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Alloys to Replace Mg Anodes in Efficient and Practical Mg-Ion/Sulfur Batteries

Abstract : The development of rechargeable Mg/S batteries is driven by the design of reliable electrolytes. To date, they seem not suitable for industrial transfer as they are either corrosive or necessitate a complex formulation. The innovative strategy reported here, which replaces magnesium by Mg alloys at the negative electrode, enables employing facile electrolyte formulations as well as proposes an easier electrode-shaping process. As a proof-of-concept, Mg3Bi2/S cells were evaluated with simple Mg(TFSI)2/DME electrolyte. Electrochemical mechanisms including Mg3Bi2 dealloying and sulfur magnesiation were probed by X-ray diffraction and X-ray photoelectron spectrocsopy, respectively. In addition, very promising cycling performance at elevated current density is obtained. These preliminary findings pave the way for additional improvements toward further practical applications.
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https://hal.archives-ouvertes.fr/hal-02268144
Contributor : Romain Berthelot <>
Submitted on : Tuesday, August 20, 2019 - 2:16:54 PM
Last modification on : Monday, May 10, 2021 - 3:36:03 PM

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Zhen Meng, Dominique Foix, Nicolas Brun, Rémi Dedryvère, Lorenzo Stievano, et al.. Alloys to Replace Mg Anodes in Efficient and Practical Mg-Ion/Sulfur Batteries. ACS Energy Letters, American Chemical Society 2019, pp.2040-2044. ⟨10.1021/acsenergylett.9b01389⟩. ⟨hal-02268144⟩

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