Improving optical features and electrochemical efficiency of vanadium-doped lithium borate glasses for Li-ion batteries

Abstract

In this framework, lithium vanadium-borate 30Li2O-(20+x)V2O5-(50-x)B2O3 glasses encoded as LVB, x ranges from 10 to 40 mol%, were synthesized. The thermal stability, the amorphous state and the surface morphology of LVB glasses were determined via differential scanning calorimetry DSC, X-Ray diffraction XRD, and scanning electron microscope SEM, respectively. FTIR and Raman spectra have provided information about the functional groups. The energy of the bandgap was calculated, which decreased from 3.507 eV to 2.779 eV. The optical constants, loss energy tanδ, sheet resistance Rsh, the coverage density D, and the figure of merit ϕ were all calculated. The charge and discharge curves of glasses were discussed. Capacities during charging were measured at 212, 197, 164.47, and 112 mAh/g. During discharge, capacities were measured at 290, 165, 147, and 112 mAh/g which represent the charge released per unit mass.