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Carbon-Polytetrahydrofuran Double-Coated Na~3~V~2~(PO~4~)~2~F~3~Submicron-Composite as High-Energy/Power Cathode Material for Sodium Metal Battery by Hougao Xiong; Yutao Liu; Yifu Yang; Huixia Shao is a Engineering article available to read on EtoBox.

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A carbon-polytetrahydrofuran double-coated Na 3 V 2 (PO 4 ) 2 F 3 composite has been prepared by synthesis of carbon coated Na 3 V 2 (PO 4 ) 2 F 3 followed by in situ polymerization of tetrahydrofuran on its surface. Thermal gravimetry analysis, Fourier transform infrared spectrum and high-resolution transmission electron microscopy are used to confirm the encapsulation structure of the inner carbon layer and the outer polytetrahydrofuran layer on Na 3 V 2 (PO 4 ) 2 F 3 . Electrochemical tests show that electrochemical performance and electronic conductivity of the composite are significantly improved due to the polytetrahydrofuran coating, and a reversible capacity of 123.6 mAh g -1 at a moderate 2 C rate is obtained with a high capacity retention of 98.5% after 250 cycles. Even at an extremely high rate of 10 C the discharge capacity is still as high as 115.8 mAh g -1 with a capacity retention of 80% over 400 cycles. Interestingly, sodium ion distribution in augmented triangular prismatic sites of Na 3 V 2 (PO 4 ) 2 F 3 is not unchanged, but shifts from the high energy Na(2)' site to the low energy Na(3)' site after a certain cycle, thus Na 3 V 2 (PO 4 ) 2 F 3 could obtain a high

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Author

Hougao Xiong; Yutao Liu; Yifu Yang; Huixia Shao

Publisher

The Electrochemical Society

Published

2018

Language

EN

Field

Engineering (Physical Sciences)