Multi-hierarchical nanosheet-assembled chrysanthemum-structured Na3V2(PO4)3/C as electrode materials for high-performance sodium-ion batteries

• Published in: Ionics Vol. 24; no. 6; pp. 1663 - 1673
• Main Authors: Ruan, Yanli, Liu, Jingjing, Song, Shidong, Jiang, Ningyi, Battaglia, Vincent
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2018; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Current density; Diffusion coating; Electrochemical analysis; Electrochemistry; Electrode materials; Energy consumption; Energy Storage; Ion diffusion; Nanosheets; Optical and Electronic Materials; Original Paper; Rechargeable batteries; Renewable and Green Energy; Sodium diffusion; Sodium-ion batteries; Structural hierarchy; Nanosheets; Na; C; Sodium-ion batteries; V; ); Cathode materials; PO
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-017-2342-0

The structure and morphology of sodium vanadium phosphate (Na 3 V 2 (PO 4 ) 3 ) play a vital role in enhancing the electrochemical performance of sodium-ion batteries due to the inherent poor electronic conductivity of the phosphate framework. In order to improve this drawback, a new chrysanthemum-structured Na 3 V 2 (PO 4 ) 3 /C material has been successfully assembled with multi-hierarchical nanosheets via a hydrothermal method. Continuous scattering nanosheets in chrysanthemum petals are beneficial in reducing energy consumption during the process of sodium ion diffusion, on which the carbon-coated surface can significantly increase overall conductivity. The as-prepared sample exhibits outstanding electrochemical performance due to its unique structure. It rendered a high initial specific capacity of 117.4 mAh g −1 at a current density of 0.05 C. Further increasing the current density to 10 C, the initial specific capacity still achieves 101.3 mAh g −1 and remains at 87.5 mAh g −1 after 1000 cycles. In addition, a symmetrical sodium-ion full battery using the chrysanthemum-structured Na 3 V 2 (PO 4 ) 3 /C materials as both the cathode and anode has been successfully fabricated, delivering the capacity of 62 mAh g −1 at 1 C and achieving the coulombic efficiency at an average of 96.4% within 100 cycles. These results indicate that the new chrysanthemum-structured Na 3 V 2 (PO 4 ) 3 /C can provide a new idea for the development of high-performance sodium-ion batteries.