Electrochemical Conditioning‐Free and Water‐Resistance of the hybrid AlCl₃/MgCl₂/Mg(TFSI)₂ Electrolytes for Rechargeable Mg Batteries

Rechargeable magnesium batteries are thought of a promising alternative to Li‐based energy storage due to the abundant and inexpensive resources. Due to the high sensitivity and reactivity of the organic Mg²+ electrolyte, it is still a challenge to develop high‐performance electrolyte. In this studies, we have developed a new hybrid electrolyte, including three simple inorganic salts of AlCl₃, MgCl₂ and Mg(TFSI)₂. The hybrid electrolyte exhibited unprecedented electrochemical performance for reversible deposition and stripping of Mg, with Coulombic efficiency up to 97%, overpotential down to 0.10 V, good stability especially for aluminum and stainless steel current collector. Most importantly, the electrolyte could maintain its activity even after introducing 2000 ppm water and it could be prepared by impure chemicals, which make it more promising for potential applications. Finally, we assembly a full cell with the hybrid electrolyte and Mg foil as anode, Mo6S8 as cathode. The cell showed a specific capacity of 98 mAh/g and could maintain 94% capacity after 100 cycles at a rate of 0.20 C, indicating the good compatibility of the hybrid electrolyte.

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