Rechargeable aluminum batteries: effects of cations in ionic liquid electrolytes.

Room temperature ionic liquids (RTILs) are solvent-free liquids comprised of densely packed cations and anions. The low vapor pressure and low flammability make ILs interesting for electrolytes in batteries. In this work, a new class of ionic liquids were formed for rechargeable aluminum/graphite battery electrolytes by mixing 1-methyl-1-propylpyrrolidinium chloride (Py13Cl) with various ratios of aluminum chloride (AlCl 3 ) (AlCl 3 /Py13Cl molar ratio = 1.4 to 1.7). Fundamental properties of the ionic liquids, including density, viscosity, conductivity, anion concentrations and electrolyte ion percent were investigated and compared with the previously investigated 1-ethyl-3-methylimidazolium chloride (EMIC-AlCl 3 ) ionic liquids. The results showed that the Py13Cl-AlCl 3 ionic liquid exhibited lower density, higher viscosity and lower conductivity than its EMIC-AlCl 3 counterpart. We devised a Raman scattering spectroscopy method probing ILs over a Si substrate, and by using the Si Raman scattering peak for normalization, we quantified speciation including AlCl 4 - , Al 2 Cl 7 - , and larger AlCl 3 related species with the general formula (AlCl 3 ) n in different IL electrolytes. We found that larger (AlCl 3 ) n species existed only in the Py13Cl-AlCl 3 system. We propose that the larger cationic size of Py13 + (142 Å 3 ) versus EMI + (118 Å 3 ) dictated the differences in the chemical and physical properties of the two ionic liquids. Both ionic liquids were used as electrolytes for aluminum-graphite batteries, with the performances of batteries compared. The chloroaluminate anion-graphite charging capacity and cycling stability of the two batteries were similar. The Py13Cl-AlCl 3 based battery showed a slightly larger overpotential than EMIC-AlCl 3 , leading to lower energy efficiency resulting from higher viscosity and lower conductivity. The results here provide fundamental insights into ionic liquid electrolyte design for optimal battery performance.