Pulsed field gradient NMR measurements were carried out to determine the self-diffusion coefficients of the Li ion (D-Li) and anion (D-F) by Li-7 and F-19 species. The D-F of LiCF3SO3 in propylene carbonate (PC) solvent increased with the decrease of molar concentration and larger than D-Li in whole concentration region. The D-Li also increased with the concentration decrease and then saturated in the lower concentration region. The effective ionic radius of lithium estimated from the D-Li was about four times larger than that of naked Li ion. This indicates the solvation effect of PC on dissociated Li ions. In order to enhance the Li ion transport number of electrolytes, two types of acidic materials, trimethoxyborane ((CH3O)(3)B) and trimethyleneborate ((CH2)(3)(BO3C3H6)(2)) were added into PC solution of LiCF3SO3 changing the mixing ratio of the salt to the acid. The D-F decreased with the increase of (CH3O)(3)B content in spite of the decrease of the solution viscosity. The addition of (C(H)2)(3)(BO3C3H6)(2), on the other hand, induced decrease of both D-Li and D-F, mainly due to the increase of the solution viscosity. These results suggest that (CH3)(3)BO3 is effective to increase the transport number due to the acidic trapping effect on anions.