Specific Energies of Concentration Cells Using Room Temperature Chloroaluminate Ionic Liquids

摘要

Acid-base concentration cells using room temperature ionic liquids have been constructed, discharged, and analyzed in previous work in the Frank J. Seiler Research Laboratory. The ionic liquid electrolytes in these cells are formed by mixing 1-methyl-3-ethylimi-dazolium chloride (MC1) with AlCl3 at various mole fractions, N, of AlCl3. The proposed electrode processes in the cell are oxidation of the aluminum anode in basic melts, N < or = 0.5, and reduction of Al2Cl7 in acidic melts, N > or = 0.5, to A1 at the cathode. The theoretical specific energies of such cells depends on the values of N for the acidic and basic melts and the transport numbers of the M+, AlCl4, and Al2Cl7 ions. This report shows how the specific energy depends on these parameters and how theoretical specific energies were calculated. Theoretical results are also shown to agree with previously obtained experimental results.