Mixed polyanion Na2O-CuO-V2O5-P2O5 glass and glass ceramic cathode network: Relationship between structure and electrochemical performance

This investigation presents mixed polyanion G-NaCu 1 − x (VO) x PO 4 (x = 0.1, 0.3, 0.5,0.7and 0.9 mol%) glass-based cathode material network prepared using the melt-quenching process followed by heat-treating at its T c for 5h to form its glass-ceramic(GC- NaCu 1 − x (VO) x PO 4 ). The best crystalline NaV 2 O 5 (ICSD 760908) NaCu(PO 4 )(ICSD 581303), and Na 2 Cu(P 2 O 7 )(ICSD 556822) phases precipitated in the glass network during crystallization will accommodate sudden volume changes, resulting to trigger the fast diffusion of Na + ions in the glass-ceramic network leading to fast rate capability and voltage for longer durations. The lowest charge transfer resistance R ct = 7.086x10 3 Ω from 1st to 1000 cycles and highest retention of discharge capacity (99.71%) when the current rate is decreased from 10C to 0.1C, determines its long-term cycle life stability and rate capability more than other crystalline compounds.