The solvation states and properties of organic solvent electrolytes were investigated by C-13 NMR measurements. The electrolytes were binary mixtures composed of halogenated cyclic carbonates such as chloroethylene carbonate (CI-EC) or trifluoropropylene carbonate (TFPC) and a linear carbonate. Comparisons were made with the non-halogenated propylene carbonate (PC)/dimethyl carbonate (DMC) system. The solution structures of Cl-EC/DMC and TFPC/DMC systems, differing from those of PC/DMC system, have both cyclic and linear carbonates solvating to lithium ions. A study was also carried out on the performances of the model cells using organic electrolytes containing Cl-EC and TFPC as solvent, carbon anode, and lithium foil counter electrode. The current density dependence of the system using the pure TFPC as a solvent was much different from that of other systems. This is mainly due to the properties of interface between electrolyte and electrode of the cell.