Tungsten disulfide coupling with halogen-free electrolyte for magnesium battery applications.

Alahmadi, M.; El-Dek, Engy; Moselhy, Mostafa A.; Mostafa, Abdel Monem; Neair, Shereen H.; Refai, H. S.; El-Desoky, M. M.; Yang, Xiao-Yu; Sheha, E.

Magnesium batteries are promising post-lithium storms for their low cost and high energy density. Engineering novel cathodic materials compensate for the charge imbalance due to the introduction of the bivalent magnesium cation in the framework of the cathode, which is one of the key solutions for realizing a practical Mg battery. Herein, crystal engineering of WS2 using the Al doping strategy is conducted to regulate magnesium storage and electrochemical reaction kinetics of WS2 cathodes. Tungsten disulfide (WS2) and Al-doped WS2 (WS2@Alx, x = 0, 2, and 4 wt.%) are prepared by a one-step hydrothermal technique and used as a cathode material for magnesium batteries. We explore the Mg2+ insertion/extraction process on the WS2@Alx in the presence of a halogen-free electrolyte (HFE) based on 0.69 M Mg(NO3)2·6H2O dissolved in acetonitrile (ACN) to tetra ethylene glycol dimethyl ether (G4) (∼2:1). The Mg/WS2 full battery containing Al delivered a higher initial discharge capacity than the Al-free cell. Introducing an anode/electrolyte polymer interface inhibits the passivation of Mg anode via insulation between the liquid electrolyte and Mg anode. This study provides an effective method to design a practical Mg cathode and a new understanding of crystal engineering of WS2 by Al doping. This may help construct high-performance cathodes for Mg battery applications.

DIOXANE; CHEMICAL kinetics; MAGNESIUM ions; ENERGY density; POLYELECTROLYTES

Journal of Solid State Electrochemistry, 2024, Vol 28, Issue 9, p3109

1432-8488

Academic Journal

10.1007/s10008-024-05872-z