Sodium vanadium titanium phosphate electrode for symmetric sodium-ion batteries with high power and long lifespan

Dongxue Wang, Xiaofei Bie, Qiang Fu, Ditty Dixon, Natalia Bramnik, Yong-Sheng Hu, Francois Fauth, Yingjin Wei, Helmut Ehrenberg, Gang Chen and Fei Du ()
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Dongxue Wang: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University
Xiaofei Bie: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University
Qiang Fu: Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT)
Ditty Dixon: Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT)
Natalia Bramnik: Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT)
Yong-Sheng Hu: Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, School of Physical Sciences, University of Chinese Academy of Sciences
Francois Fauth: CELLS-ALBA Synchrotron
Yingjin Wei: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University
Helmut Ehrenberg: Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT)
Gang Chen: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University
Fei Du: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Sodium-ion batteries operating at ambient temperature hold great promise for use in grid energy storage owing to their significant cost advantages. However, challenges remain in the development of suitable electrode materials to enable long lifespan and high rate capability. Here we report a sodium super-ionic conductor structured electrode, sodium vanadium titanium phosphate, which delivers a high specific capacity of 147 mA h g−1 at a rate of 0.1 C and excellent capacity retentions at high rates. A symmetric sodium-ion full cell demonstrates a superior rate capability with a specific capacity of about 49 mA h g−1 at 20 C rate and ultralong lifetime over 10,000 cycles. Furthermore, in situ synchrotron diffraction and X-ray absorption spectroscopy measurement are carried out to unravel the underlying sodium storage mechanism and charge compensation behaviour. Our results suggest the potential application of symmetric batteries for electrochemical energy storage given the superior rate capability and long cycle life.

Date: 2017
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DOI: 10.1038/ncomms15888

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