Journal
NANO ENERGY
Volume 28, Issue -, Pages 216-223Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.08.010
Keywords
High-voltage; Na3V2(PO4)(3); Sodium-ion full cell; Polarization suppression
Categories
Funding
- National Basic Research Program of China [2013CB934103, 2012CB933003]
- International Science and Technology Cooperation Program of China [2013DFA50840]
- National Natural Science Foundation of China [51302203, 51272197, 51521001]
- Hubei Province Natural Science Fund for Distinguished Young Scholars [2014CFA035]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- Fundamental Research Funds for the Central Universities [WUT: 2015-111-021, 2015-111-032, 2015-111-052, 2015-PY-2]
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The application of sodium-ion batteries (SIBs) is largely depended on the high energy density electrode system since it suffers from intrinsic high voltage of Na (0.33 V vs. Li). To overcome these limitations, we propose a high-voltage sodium-ion full cell via cathodic polarization suppression. NASICON structured Na3V2(PO4)(3) (NVP) cathode and poorly-graphitized hard carbon (HC) anode are synthesized as the targeted materials through an easily scalable coprecipitation method and a simple biomass-directed technique, respectively. Through morphologic optimization and carbon decoration, the NVP half cell demonstrates a high output voltage of 3.4 V, ultralong cyclability (over 4000 cycles) and distinguished rate capability (77 mA h g(-1) at 150 degrees C), which is attributed to the enhanced electrical transport behaviors and carrier transmission dynamics. When extended to NVP//HC, the overpotential has been successfully restrained, and the full cell exhibits a theoretical average voltage of 3.3 V, which shows substantial increases in the energy density ( > 20%) compared to bulk and bare NVP based full cell. The prototype design of high-energy and low-cost sodium-ion full cell in this work opens the door for accelerating the development and application of SIBs. (C) 2016 Elsevier Ltd. All rights reserved.
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