The self-diffusion coefficients, D, of lithium, anions, and solvents in four binary-solution electrolytes of ethylene carbonate (EC)-diethyl carbonate (DEC) and three single-solution electrolytes of EC, DEC, and propylene carbonate (PC) including 1 M LiPF6 were measured by H-1, Li-7, and F-19 NMR spectroscopy from (353 to 243) K or above freezing for seven solution electrolytes. In the single DEC electrolyte, D-Li and D-PF6 had almost the same values at every temperature, whereas D-Li was smaller than D-PF6 in the EC and PC solutions. In the binary EC-DEC electrolytes, as the ratio of EC increased, D-Li gradually became smaller, while D-PF6 remained almost unchanged in the temperature range studied. At 303 K, the degree of ion dissociation alpha was evaluated from the ionic conductivity, D-Li and D-PF6. The alpha value increased from 0.17 to 0.71 as the EC ratio increased from (0 to 100) %.