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

Wang, Dongxu; Bie, Xiaofei; Fu, Qiang 1; Dixon, Ditty 1; Bramnik, Natalia 1; Hu, Yong-Sheng; Fauth, Francois; Wei, Yingjin; Ehrenberg, Helmut 1; Chen, Gang; Du, Fei
1 Institut für Angewandte Materialien (IAM), Karlsruher Institut für Technologie (KIT)


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.

Volltext §
DOI: 10.5445/IR/1000072214
DOI: 10.1038/ncomms15888
Zitationen: 203
Zitationen: 212
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000072214
HGF-Programm 37.01.12 (POF III, LK 01) Intercalation
Erschienen in Nature Communications
Verlag Nature Research
Band 8
Seiten Art.Nr.: 15888
Nachgewiesen in Scopus
Web of Science
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