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Prepare TiO2doped with ZnO or Fe2O3composite photocatalytic film by using sol-gel method and characterize its microstructure and light absorption performance with X-ray diffraction instrument (XRD), scanning electron microscopy (SEM) and UV-visible spectrophotometer. The results show that: particles of TiO2doped with Fe2O3composite photocatalytic film are uniform and well dispersed; the rough surface of the film has a certain gap which is helpful for the adhesion of gas and liquid; the diameter of the particles is about 50 nm. The crystal grain size of TiO2film doped with ZnO is bigger, about 100 nm; the gap of the film is less and particles are nearly spherical and protruding, the shape of grain is structured. The absorption spectrum of TiO2doped with ZnO or Fe2O3has a red shift and both of their absorption intensity is higher than that of pure TiO2film in the scope of the ultraviolet and visible region.

Lithium-ion secondary cell has high energy density, stable and high working voltage, wide working temperature and long working term. It is a safe and clean energy resource without pollution. At present, Lithium Hexafluorophosphate is used as conducting electrolyte lithium salt in lithium-ion secondary batteries. But Lithium Hexafluorophosphate as conducting electrolyte lithium salt has some disadvantages such as hydrolysis and instability. Lithium Bis (heptafluoroisopropyl) t-etrafluorophosphate Li [(C3F7)2PF4] was received by simons process from diisopropylchlorophosphane in this paper. As electrolyte of Li ion secondary cell, Li [(C3F7)2PF4] had lower vapor pressure than LiPF6 in the solvent in the same temperature, comparable conductivity and oxidation stability in the same concentration in room temperature. It was worth mentioning that Li [(C3F7)2PF4] has excellent stability towards hydrolysis. The synthesis process is safe and easily controlled.