Electrochemical Performance Of Na2o-Li2o-P2s5-V2s5 Glass-Ceramic Nanocomposites As Electrodes For Supercapacitors

The glass-ceramic nanocomposites, based on 18.75Na(2)O-18.75Li(2)O-37.5P(2)S(5)-25V(2)S(5) mol% glass, were successfully fabricated via heat treatment (HT) process at 405 degrees C for various times in the midair. The effects of HT time and nanostructure on the electrochemical performance for the glass-ceramic nanocompositions electrodes were examined by using DSC, XRD, TEM, FESEM, and electrochemical techniques, including cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The crystallite size was between 37 and 50 nm. FESEM morphologies displayed no uniform particles, which change with a difference of HT time. Benefiting from the existence of nanostructure in the glass-ceramic nanocompositions, the electrodes show a high specific capacitance up to 227.36 F g(-1) at 1 A g(-1) (based on the glass-ceramic nanocomposition heat treated for 20 h, which has the smallest crystallite size) and outstanding cycling stability (94% capacitance retention after 1000 cycles). In addition, the glass-ceramic nanocomposition electrode heat treated for 20 h demonstrated a higher energy density of 31.58 Wh kg(-1) at 500 W kg(-1). Thus, the outstanding performance of this fabricated glass-ceramic nanocomposition electrodes have delivered a suitable design strategy for improving high-performance supercapacitors.