Electrochemical performance of novel Li3V2(PO4)3 glass-ceramic nanocomposites as electrodes for energy storage devices

• Published in: Journal of solid state electrochemistry 2016, Vol.20 (10), p.2663-2671
• Main Authors: El-Desoky, M. M., Al-Syadi, A. M., Al-Assiri, M. S., Hassan, Hassan M. A., El Enany, Gaber
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Aqueous electrolytes; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrochemistry; Electrodes; Electrons; Energy Storage; Glass ceramics; Heat treatment; Industrial applications; Ion diffusion; Ionic mobility; Lithium ions; Nanocomposites; Original Paper; Physical Chemistry; Sulfuric acid
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-016-3267-7

The novel Li 3 V 2 (PO 4 ) 3 glass-ceramic nanocomposites were synthesized and investigated as electrodes for energy storage devices. They were fabricated by heat treatment (HT) of 37.5Li 2 O–25V 2 O 5 –37.5P 2 O 5  mol% glass at 450 °C for different times in the air. XRD, SEM, and electrochemical methods were used to study the effect of HT time on the nanostructure and electrochemical performance for Li 3 V 2 (PO 4 ) 3 glass-ceramic nanocomposites electrodes. XRD patterns showed forming Li 3 V 2 (PO 4 ) 3 NASICON type with monoclinic structure. The crystalline sizes were found to be in the range of 32–56 nm. SEM morphologies exhibited non-uniform grains and changed with variation of HT time. The electrochemical performance of Li 3 V 2 (PO 4 ) 3 glass-ceramic nanocomposites was investigated by using galvanostatic charge/discharge methods, cyclic voltammetry, and electrochemical impedance spectroscopy in 1 M H 2 SO 4 aqueous electrolyte. The glass-ceramic nanocomposites annealed for 4 h, which had a lower crystalline size, exhibited the best electrochemical performance with a specific capacity of 116.4 F g −1 at 0.5 A g −1 . Small crystalline size supported the lithium ion mobility in the electrode by decreasing the ion diffusion pathway. Therefore, the Li 3 V 2 (PO 4 ) 3 glass-ceramic nanocomposites can be promising candidates for large-scale industrial applications in high-performance energy storage devices.