Preparation and characterization of lithium trivanadate thin films by spray pyrolysis method for supercapacitor applications

被引:5
作者
Varghese, Rojin [1 ]
Vijay, V. Shobin [1 ]
Shanmugaraj, Pavithra [1 ]
Unnikrishnan, Gayathri [1 ]
Swaminathan, Rajesh [1 ]
Ayyasamy, Sakunthala [1 ]
机构
[1] Karunya Inst Technol & Sci, Dept Appl Phys, Solid State Ion & Thin Film Batteries Lab, Coimbatore 641114, Tamil Nadu, India
关键词
Lithium trivanadate; Thin film; Spray pyrolysis; Nanorod; Symmetric supercapacitor; Specific capacitance; ELECTROCHEMICAL PROPERTIES;
D O I
10.1016/j.tsf.2023.139755
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The lithium trivanadate (LiV3O8) thin films were deposited over stainless steel (SS) substrates by spray pyrolysis method. The material deposited at an optimized substrate temperature of 350 degrees C and at an annealing temperature of 500 degrees C (LV350_500/SS) performed better in electrochemical properties. The structural and surface morpho-logical characteristics of the as deposited materials were determined using the X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) analyses. The stable V5+ state was observed for the as-prepared LiV3O8 thin film in the X-ray photoelectron (XPS) spectrum. The electrochemical performance of the thin films were characterized using a three-electrode configuration with Ag/AgCl as the reference electrode, thin film material as the working electrode, and the platinum wire as the counter electrode. The 1 M LiNO3 aqueous solution was taken to be the electrolyte. LV350_500/SS made using a Li/V molar concentration of 0.1: 0.3 displayed an initial specific discharge capacitance value of 695 Fg-1 at a current density of 0.25 Ag-1, in the voltage range of-0.4 V to 0.4 V. But, the LV350_500/SS prepared using Li/V molar concentration of (0.05: 0.15) showed a low specific capacitance value of 181 Fg-1. A symmetric supercapacitor device made with the LV350_500/SS thin film as the electrodes and poly(vinylidene fluoride-co-hexafluoropropylene)/2D Graphene Oxide (PVdF-HFP/GO) composite polymer membrane as the electrolyte showed an excellent specific discharge capacitance value of 31 Fg-1 for a current density of 0.25 Ag-1. The calculated specific energy density and specific power density values were found to be 69 Whkg-1 and 1002 Wkg-1 respectively, for the above sym-metric device.
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页数:10
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