Comparison of Chloroaluminate Melts for Aluminum Graphite Dual‐Ion Battery Application

Herein, we report a comparison of aluminum graphite dual‐ion cells (AGDICs) electrochemical characteristics employing the conventional 1‐ethyl‐3‐methylimidazolium chloride:aluminum trichloride (EMIMCl : AlCl${}_3$) electrolyte and two popular deep eutectic solvents (DESs), namely urea : AlCl${}_3$ and acetamide:AlCl${}_3$. The three electrolytes′ characteristics have been evaluated in terms of Al‐stripping deposition capability and cycling behavior in AGDICs. The results evidence the EMIMCl : AlCl${}_3$′s Al‐stripping deposition and rate capability in AGDICs superior characteristics addressed to the lower viscosity and higher conductivity with respect to the urea : AlCl${}_3$ and acetamide:AlCl${}_3$. On the other hand, the urea : AlCl${}_3$ guarantees a much higher columbic efficiency in AGDICs, thanks to the superior electrochemical window stability.