Energy storage studies of bare and doped vanadium pentoxide, (V1.95M0.05)O5, M = Nb, Ta, for lithium ion batteries

Abstract

The bare V 2 O 5 and doped (V 1.95 M 0.05 )O 5 (M ¼ Nb, Ta) nano/submicron sized compounds were prepared by the simple polymer precursor method. The compounds were characterized by different physical and electroanalytical techniques. The effects of doping and different synthesis conditions on the energy storage performance of the V 2 O 5 compounds were discussed. All compounds delivered a discharge capacity (at the end of the 2 nd cycle) in the range 245 to 261 (AE3) mA h g À1 , except for the tantalum doped compound (V 1.95 Ta 0.05 )O 5 which exhibited a discharge capacity of 210 (AE3) mA h g À1 , cycled in the range 2.0-4.0 V at a current rate of 120 mA g À1 . An excellent cycling stability of 96% till twenty cycles was achieved for the compound V 2 O 5 prepared by the polymer precursor method. Electrochemical impedance spectroscopy studies at different voltages during discharge and charge cycles were discussed in detail.

Self-assembled V2O5 interconnected microspheres produced in a fish-water electrolyte medium as a high-performance lithium-ion-battery cathode

“…The R ct values were found to increase in the fully discharged state (454 Ω) and decrease in the fully charged state (307 Ω). This indicates that the Li intercalation (discharge) was not as smooth as Li de-intercalation (charge) [39,40]. However, this structure provided much easier charge transfer at the electrode-electrolyte interface and consequently decreased the overall internal resistance of the cell, which accounts for the excellent rate capability and cycling stability of the electrode.…”

Pristine hollow microspheres of Mn2O3 as a potential anode for lithium-ion batteries

“…44 Interestingly, formation of Mn 2 O 3 is understood from the appearance of new bands at 575 and 667 cm -1 , which could be attributed to the M-O bonds of Mn 2 O 3 (Fig. [47][48][49] Fig . 9,45 In order to get further information about the purity and chemical composition of the sample, we carried out X-ray photoelectron spectroscopy (XPS).…”

Electrostatic spray deposition of porous Fe2V4O13 films as electrodes for Li-ion batteries

“…polyaniline and polypyrrole [5]). Among these materials, vanadium oxide [6][7][8][9][10] and metal-vanadium-based oxides [11][12][13][14] [15]. The electrochemical performance of FeVO 4 ·nH 2 O was also studied and it was found that the insertion capacity highly depends upon the water content [16][17][18].…”