Non-aqueous LiClO4 solutions kneaded with various fumed oxides (fumed silica, fumed alumina, and fumed titania) were employed as model systems of lithium ion batteries. The properties of the solid phase and Li + ions, which affect solvent molecules, were evaluated using 1 H NMR spectroscopy and 1 H NMR relaxation time (T1, T2) measurements. The 1 H NMR signals of propylene carbonate (PC) molecules were influenced by the coexisting solid phase in the LiClO4-PC solution/fumed oxide nanoparticle dispersion. The mobilities of the PC molecules drastically decreased in the presence of only 1-2 vol% of the solid phase (liquid phase thickness is 15-20 nm or less), regardless of the fumed oxide employed. In the IR spectra of the PC/fumed alumina systems, the vibrations at higher wavenumbers were predominantly observed because of indirect electron-donation

Dynamic properties related to 1 H NMR relaxation in SiO2 fine powder/non-aqueous LiClO4 solution was measured for using propylene carbonate (PC) and PC-1,2-dimethoxyethane (DME). The influence of solid phase and variation of effect of DME on ionic mobility is also discussed. For 1 H NMR spectra of PC-DME binary solution, adding of SiO2 powder caused the broadening of NMR signal of 1 H in PC and DME molecules. In pure PC-DME system, since DME is preferentially affected by solids rather than PC, as the ratio of DME increased, values of solvent molecules detected by NMR decreased. In 1 mol/L LiClO4/PC-DME system, as the ratio of DME in solution was higher, The interaction between the PC and the Li + ion is weakened by the decrease of the dissociation degree, and the mobility of the PC was restored.

In this study, the non-aqueous LiClO4 solution mixed with fumed silica as model system of LIBs was applied, and the dynamic properties and influences which solvent molecules received from solid phase or Li + ion in using the NMR spectroscopy and the relaxation time (T1, T2) measurements were evaluated. The NMR signal of 1 H in PC molecules is influenced by coexisting solid phase in LiClO4-PC solution /oxide powder. The dynamic property of the PC molecules drastically decreased in comparison with the system of the liquid only system. In IR spectra of PC/Alumina systems, the vibration in higher wavenumber range are predominantly observed due to indirect electron-donation from solid surface. The signal intensity depends on influenced liquid content from solid phase. Especially, the LiClO4-PC solution /alumina systems, the intensity is abruptly decreased due to widely spread influences of solid phases. Moreover, the influence from the solid phase to the PC molecules is much smaller than the water molecules from the 1H spin-spin relaxation time (T2). As for the electrolyte concentration dependence, PC system was more remarkable than the water solution system, namely the network structure of the whole PC solvent is greatly affected by the addition of the Li + ion, and it is thought that relaxation time largely decreased.