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Issue 14, 2018
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Na3V2(PO4)2F3@C dispersed within carbon nanotube frameworks as a high tap density cathode for high-performance sodium-ion batteries

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Abstract

Currently, the sodium-ion battery is one of the hottest topics in the field of battery research. For practical application, however, high tap density, which is a key point of electrode materials, has always been ignored in previous studies. Here, we present the fabrication of a NASICON-type Na3V2(PO4)2F3@C/CNT composite cathode with a high tap density of 1.2 g cm−3 for high power and long lifespan sodium-ion batteries. The spherical NVPF@C/CNTs synthesized through a spray drying method are composed of micron-sized primary particles dispersed within the intertwined carbon nanotube matrix. The CNT framework not only provides an efficient electrical highway between primary particles, but also forms a stable mechanical backbone for secondary particles. The initial discharge capacity of NVPF@C/CNTs is about 113 mA h g−1 at a current density of 1C, and the cell retains 98.2% after 300 cycles. Besides, a high rate capacity of 85 mA h g−1 has been achieved at 30C. We believe that our work presented here will be favorable for accelerating the commercialization of sodium-ion batteries.

Graphical abstract: Na3V2(PO4)2F3@C dispersed within carbon nanotube frameworks as a high tap density cathode for high-performance sodium-ion batteries

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Supplementary files

Article information


Submitted
30 Jan 2018
Accepted
19 Feb 2018
First published
20 Feb 2018

J. Mater. Chem. A, 2018,6, 6007-6014
Article type
Paper

Na3V2(PO4)2F3@C dispersed within carbon nanotube frameworks as a high tap density cathode for high-performance sodium-ion batteries

C. Shen, H. Long, G. Wang, W. Lu, L. Shao and K. Xie, J. Mater. Chem. A, 2018, 6, 6007
DOI: 10.1039/C8TA00990B

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