This study reports a reversible oxygen reduction-oxygen evolution reaction (ORR-OER) that uses a solvate ionic liquid, [Li(triglyme)(1)][NTf2], as an electrolyte for a rechargeable Li-air (02) battery. Significantly, it was found that the reversibility and capacity retention for ORR-OER in the solvate ionic liquid was greatly improved with a decrease in the ORR discharge depth; the discharge to 2.2 V vs. Li/Li+ gave much better reversibility than that to 2.0 V vs. Li/Li+.