期刊
ENERGY TECHNOLOGY
卷 2, 期 8, 页码 705-712出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201402045
关键词
aqueous electrolyte; carbon nanotubes; energy storage; NASCION sodium-ion batteries
资金
- National Basic Research Program of China (973 Program) [2014CB239701]
- National Natural Science Foundation of China [21173120, 51372116]
- Natural Science Foundation of Jiangsu Province [BK2011030]
- Fundamental Research Funds for the Central Universities of NUAA [NP2014403]
Sodium-ion batteries with good electrochemical performance are of great significance for grid-scale energy storage applications. Herein, an aqueous rechargeable Na-ion battery has been fabricated with multiwalled carbon nanotube (MWNT)-containing NaTi2(PO4)(3)/MWNTs nanocomposites as the anode and Na0.44MnO2 nanorods as the cathode in a 1m aqueous Na2SO4 electrolyte and the device was carefully studied. Owing to the open framework structures (containing large interstitial sites) that both NaTi2(PO4)(3) and Na0.44MnO2 possess, the fast Na-ions will facilitate free transport. Benefiting from their unique structural features, the aqueous battery system exhibited an average charge and discharge voltage of approximately 1.1 V, a high energy density of 58.7 Whkg(-1) in terms of total electroactive materials, and could deliver a reversible capacity of approximately 50 mAhg(-1) after 300 cycles at 2 degrees C rate; the corresponding coulombic efficiency was nearly constant at approximately 95%. These results, together with the safety and cost perspectives of aqueous electrolytes indicated that the aqueous Na-ion battery may be a good candidate for safe, inexpensive, high-power energy storage systems.
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