Electrochemical behavior of carbonic precursor with Na3V2(PO4)3nanostructured material in hybrid battery system
The nanostructured Na3V2(PO4)3 (NVP) cathode material has been synthesized using the sol-gel route for different molar fractions of citric acid as a carbon source during the synthesis. The nanostructured NVP as cores with carbonic shell structures are fabricated with two different citric acid molar ratios. The thermal treatment has been optimized to convert the amorphous carbon shell into graphitic carbon to realize the better electrical conductivity and thus effective electron transfer during the electrochemical charge transfer process. The X-ray diffraction measurements confirmed the rhombohedral crystallographic phase (space group R-3c) with average crystallite size ~28 ± 5 nm. The coin cells are assembled in a hybrid rechargeable electrochemical cell configuration with lithium as a counter electrode and LiPF6-EC:DEC:DMC (1:1:1 ratio) as the electrolyte. The electrochemical charge/discharge measurements are carried out at C/10 and C/20 rates and the measured specific capacities are 80 and 120 mAhg−1 for samples with lower and higher citric acid molar ratios, respectively. The studies suggest that NVP can be used as an effective cathode material in hybrid electrochemical cells, and a higher concentration of citric acid may result in the effective carbonic shell for optimal electron transfer and thus enhanced electrochemical performance.
KeywordsNa3V2(PO4)3 NASICON Cathode material Carbon percentage effect
The author Ambesh Dixit acknowledges the Department of Science and Technology (DST), Government of India (project #INT/RUS/RFBR/P-190), for the financial support for this work. The authors Aleksandr Ivanishchev and Alexei Churikov acknowledge the Russian Science Foundation (project #15-13-10006) and by the Russian Foundation for Basic Research (projects #14-29-04005, #15-53-45091).
- 17.Nie P, Zhu Y, Shen L, Pang G, Xu G, Dong S, Dou H, Zhang X (2014) From biomolecule to Na3V2(PO4)3/nitrogen-decorated carbon hybrids: highly reversible cathodes for sodium-ion batteries. J Mater Chem A 2:18606–18612Google Scholar
- 18.Zhang S, Deng C (2015) Superior sodium intercalation of honeycomb-structured hierarchical porous Na3V2(PO4)3/C microballs prepared by a facile one-pot synthesis. J Mater Chem A Mater energy Sustain 3:7732–7740Google Scholar
- 19.Song W, Cao X, Wu Z, Chen J, Huangfu K, Wang X, Huang Y, Ji X (2016) A study into the extracted ion number for NASICON structured Na3V2(PO4)3 in sodium-ion batteries. Phys Chem Chem Phys 16:17681–17687Google Scholar
- 24.Cullity BD, Stock SR (2013) Elements of X-ray diffraction 3e. PearsonGoogle Scholar