期刊
NANO ENERGY
卷 24, 期 -, 页码 130-138出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.04.021
关键词
Fe-2(MoO4)(3); NASICON; Micro-emulsion; High rate; Sodium ion battery
类别
资金
- National Basic Research Program of China [2013CB934103, 2012CB933003]
- International Science & Technology Cooperation Program of China [2013DFA50840]
- National Natural Science Foundation of China [51521001, 51272197]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- Hubei Provincial Natural Science Fund for Distinguished Young Scholars [2014CFA035]
- Fundamental Research Funds for the Central Universities [WUT: 2015-III-021, 2015-III-032, 2015-PY-2]
- Students Innovation and Entrepreneurship Training Program [20151049701034]
Na superionic conductor (NASICON) type Fe-2(MoO4)(3) with capacious ion diffusion tunnels and a flat discharge plateau, is a promising cathode material for sodium ion batteries. However, the sluggish electrochemical kinetics limits its further development due to the poor electron conductivity and long Na diffusion path. In this work, a graphene wrapped Fe-2(MoO4)(3) nanoparticle composite was synthesized via a micro-emulsion method followed by annealing. The composite exhibits ultra-high rate capability (64.1 mA h g(-1) at 100 C, better than all the reported works) and good high-rate cycling stability (76% capacity retention after 100 cycles at 10 C). The enhanced electrochemical performances are attributed to the unique composite structure with shortened ion diffusion distance and high electron conductivity. Furthermore, the Na insertion/extraction mechanism of the composite is systematically investigated, based on in-situ X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Our work demonstrates that the graphene wrapped Fe-2(MoO4)(3) nanoparticle composite has great potential for high-rate sodium ion batteries. (C) 2016 Elsevier Ltd. All rights reserved.
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