A Study of Pulsed Laser Deposited Amorphous Nickel-V2O5 Composite Film and its Electrochemical Properties

Amorphous Ni-V2O5 composite film cathodes with excellent electrochemical properties were successfully prepared by 355 nm pulsed laser reactive deposition for the first time. The optimum experimental conditions for the film deposition are：a laser fluency of 2 J/cm2，a temperature of substrate at 300℃，oxygen gas pressure 14 Pa，deposition duration 0 . 5 h and stainless steel used as a substrate material. X-ray diffraction （XRD）and scanning electron microscopy（SEM）analyses indicated that the Ni-V2O5 composite films deposited on stainless steel substrate are amorphous. Among the three composite films with different Ni-V2O5 molar ratio （x= 0.1，0.3，0.5），Ni0.3V2O5 （x= 0.3）composite film electrode exhibited best electrochemical performance. This film electrode retained a capacity of 200 mAh/g at a high rate of 20 C with excellent reversibility，upon cycling with no obvious fading over more than 1000 cycles. The improved specific capacity，rate capability and cycleability of amorphous Ni-V2O5 film electrodes demonstrate that these film electrodes could be used as a promising cathode material for all-solid-state thin film lithium ion rechargeable batteries.