Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 14, Pages 6007-6014Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta00990b
Keywords
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Funding
- National Natural Science Foundation of China [51674202, 51521061]
- Fundamental Research Funds for the Central Universities [G2016KY0307, 3102017HQZZ007]
- Key R&D Program of Shanxi [2017ZDCXL-GY-08-03]
- TOP International University Visiting Program for Outstanding Young Scholars of Northwestern Polytechnical University
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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)(2)F-3@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.
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