Electrochemical reductions of fluorinated fullerenes with compositions between C 60F 15 and C 60F 47 were investigated by potential sweep and constant current discharge in 1 M LiClO 4 propylene carbonate solution. The first reduction peak decreased from 3.28 V to 3.04 V with decreasing fluorine content of fluorinated fullerenes from C 60F 44 to C 60F 30. Carbon additives mixed in the electrodes as electrical conductors drastically changed the dissolution rate of reduced species of fluorinated C 60. The dissolution rates of the reduced anions decreased in the order of natural graphite powder, petroleum coke and acetylene black. The discharge capacities increased with decreasing dissolution rate of reduced species and with increasing fluorine content in the fluorinated C 60. Constant current discharge of C 60F 44 at 0.1 mA cm −2 gave the discharge capacity, 560 mA hg −1 and the energy density, 1400 Wh kg −1.