Journal
NANO ENERGY
Volume 28, Issue -, Pages 224-231Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.08.026
Keywords
Sodium-ion battery; Hierarchical architecture; Mesoporous nanosheet; NaTi2(PO4)(3); NASICON structure
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Funding
- National Basic Research Program of China [2013CB934103]
- National Key Research Program of China [2016YFA0202603, 2016YFA0202604]
- National Natural Science Foundation of China [51502226, 51521001, 51272197, 51302203, 51502227]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- Hubei Provincial Natural Science Fund for Distinguished Young Scholars [2014CFA035]
- China postdoctoral Science Foundation [2016M592401, 2015T80845]
- Fundamental Research Funds for the Central Universities [WUT: 2016III001, 2016III002, 2016III003, 2016III004, 2016III005, 2016III006, 152401004, 2014-IV-062, 2014-IV-147, 2015-111-022, 2016IVA091]
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NASICON structured NaTi2(PO4)(3) with stable and open framework has become a promising electrode material for sodium-ion batteries. However, the intrinsic low electronic conductivity of NaTi2(PO4)(3) leads to inferior rate capability and poor active material utilization. Herein, we first report the synthesis of carbon-coated hierarchical NaTi2(PO4)(3) mesoporous microflowers (NTP/C-F), via a facile and controllable solvothermal method and subsequent annealing treatment. The unique structural features endow the NTP/C-F with excellent structural stability, enhanced charge transfer kinetics, and suppressed polarization. This architecture exhibits superior sodium storage performance: high initial capacity (125 mA h g(-1) at 1 degrees C), outstanding rate capability (95 mA h g(-1) at 100 degrees C), and ultra-long cycling stability (capacity retention of 77.3% after 10,000 cycles at 20 degrees C). Time-resolved in-situ X-ray diffraction study reveals a typical two-phase electrochemical reaction with reversible structure change. This work suggests the integration of hierarchical structure and carbon coating provides a promising approach for boosting the electrochemical performances of battery electrode materials. (C) 2016 Published by Elsevier Ltd.
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