The electrochemical behavior of a C-60 and C-7O mixture based composite electrode is examined in propylene carbonate solutions in which C-60/C-70 is not notably soluble. A wide variety of salts based on Li+ or quaternary ammonium (NR(4)(+)) where (R=C4H9, C3H7, and C2H5) were investigated. We show that when a C60C70 electrode is first polarized towards cathodic potentials, electrochemical intercalation is observed with a step-by-step formation of fullerites salts. The relative amounts of reacted species depends on the nature of both the cation and the anion employed in the salt.