Sodium vanadate nanowires @ polypyrrole with synergetic core-shell structure for enhanced reversible sodium-ion storage

Document Type

Article

Publication Date

12-12-2016

Abstract

Use of hybridized transition-metal oxides nanostructures with a shell coating show promise for improving the electrochemical performance of sodium-ion batteries. Herein, a novel type of designed sodium vanadate @ polypyrrole (Na5V12O32@PPy) nanocomposites with a synergetic core-shell structure was fabricated using sequential hydrothermal and electrodeposition methods. When the Na5V12O32@PPy nanocomposites were employed as a cathode, the assembled sodium-ion batteries exhibited a high reversible discharge capacity of 213 mAh g?1 at a current density of 30 mA g?1, high rate performance (133 mAh g?1 at 480 mA g?1) and superior cycling performance (202 mAh g?1 at 100 mA g?1 after 100 cycles with a capacity retention of 94%). By contrast, the cycling behavior of this novel material proved to be much better than the naked Na5V12O32 nanowires. This research provides a new pathway to explore cathode materials for sodium-ion battery with enhanced electrochemical performance.

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