Aluminum-halogen fuel cell

An aluminum-halogen fuel cell comprising:

• a positive electrode;
• a negative electrode;
• and an electrolyte comprising an ionic liquid represented by formula (1):
• in the formula (1), R1 represents an unsubstituted or substituent-containing C1 to C20 alkyl group, R2 represents a hydrogen atom, a C1 to C4 alkyl group, an alkenyl group, or a polymer repeating unit derived from the alkenyl group, each of R3 and R4 independently represents a hydrogen atom, a halogen atom or a C1 to C4 alkyl group, R5 represents a hydrogen atom or a C1 to C4 alkyl group, X represents AlCl4, AlBr4, AlCl3Br or AlClBr3, and Y represents Al2Cl7, Al2Cl6Br, Al2Br7 or Al2ClBr6, provided that a combination of X and Y is a combination of AlCl4 and Al2Cl7, a combination of AlCl3Br and Al2Cl6Br, a combination of AlBr4 and Al2Br7 or a combination of AlClBr3 and Al2ClBr6, and n represents a real number of 0 to 1,
• by formula (2):
• in the formula (2), R6 represents a hydrogen atom or an unsubstituted or substituent-containing C1 to C10 alkyl group, R7 represents a C1 to C4 alkyl group, an alkenyl group, or a polymer repeating unit derived from the alkenyl group, k represents 0 or 1, and X, Y and n have the same meanings as X, Y and n in formula (1),
• or by formula (3):
• in the formula (3), A represents a nitrogen atom or a phosphorus atom, provided that when A represents a nitrogen atom, each of R8 to R11 independently represents a hydrogen atom or an unsubstituted or substituent-containing C1 to C10 alkyl group, and when A represents a phosphorus atom, each of R8 to R11 independently represents a halogen atom or an unsubstituted or substituent-containing C1 to C20 alkyl group, and X, Y and n have the same meanings as X, Y and n in formula (1).