Abstract:(TiO

2

)

x

-V

2

O

5

composite electrochemical ion storage films were prepared by sol-gel method. The effects of organic-inorganic Ti source and doping amount of TiO

2

(x=0

0.05

0.1

0.2

0.3 mol)on the microstructure and properties of V

2

O

5

films were investigated. The surface morphology

electrochemical performance and optical property were characterized

by FE-SEM

cyclic voltammetry and UV-Vis transmission

respectively. The results show that TiO

2

doping reduces the ion storage capacity of V

2

O

5

films

and(TiO

2

)

x

-V

2

O

5

composite films prepared by inorganic Ti source have higher UV-Vis transmittance and ion storage capacity than that by organic Ti source. The UV-Vis transmittance of(TiO

2

)

x

-V

2

O

5

composite films prepared by inorganic Ti source is 20% higher than that of V

2

O

5

film. Meanwhile

the ion storage capacity of V

2

O

5

films prepared by inorganic Ti source decreases with the Ti content. However

the decreasing trend of ion storage capacity of V

2

O

5

films becomes gradually slow and then keeps stable during the cycles after doping TiO

2

. The cycle stability of V

2

O

5

films can be improved by doping TiO

2

and the storage capacity of V

2

O

5

film after 50 cycles is reduced by 25% and 16% in average without and with doping TiO

2

repectively. Moreover

doping TiO

2

significantly reduces the cathode coloring effect of V

2

O

5

electrochemical ionic storage films. With the increase of TiO

2

doping amount

the UV-Vis transmittance improves.