Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector

A mixed electrolyte (IL?FB (1:5)) for aluminum ion batteries is synthesized by incorporating fluorobenzene into ionic liquid electrolyte. The IL?FB (1:5) promotes mass transport, enabling cycling for 7500 h under high current density and capacity (8 mA cm?2, 8 mAh cm?2). IL?FB (1:5) also exhibits significantly improved wetting ability with the polypropylene separator, guaranteeing 60% reduction in the cost of the AIB.The energy industry has taken notice of aluminum ion batteries (AIB) for their low cost, high safety, and high capacity. However, using the ionic liquid electrolyte results in the uneven Al electrodeposition and the reliance on expensive glass fiber separators, due to the sluggish mass transport and low wettability for the polypropylene separator. Herein, a mixed electrolyte is introduced by incorporating the co?solvent fluorobenzene into the traditional AlCl3/1?ethyl?3?methylimidazolium chloride ionic liquid, in which the fluorobenzene (FB) mitigates electrostatic interactions between ions and facilitates the ion diffusion. The optimization principle for the mixed electrolyte is proposed based on maximizing the mass transportation, as indicated by the limiting current density. The optimized mixed electrolyte IL?FB (1:5) offers the highest limiting current density of 12 mA cm?2, highly reversible plate/stripe of Al, and thus stable cycling for 7500 h with the high current density and capacity (8 mA cm?2, 8 mAh cm?2). Furthermore, IL?FB (1:5) also shows enhanced wettability for the polypropylene separator. The AIB with the polypropylene separator, exhibiting 60% decrease in cost, is achieved for the first time by using IL?FB (1:5), presenting a crucial step toward the initial practical application.

» Publication Date: 03/03/2025

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