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Superionic Lithium Intercalation through 2 nm x 2 nm Columns in the Crystallographic Shear Phase Nb18W8O69

preprint
revised on 30.03.2020, 17:01 and posted on 31.03.2020, 09:33 by Kent Griffith, Clare P. Grey

Nb18W8O69 (9Nb2O5×8WO3) is the tungsten-rich end-member of the Wadsley–Roth crystallographic shear (cs) structures within the Nb2O5–WO3 series. It has the largest block size of any known, stable Wadsley–Roth phase, comprising 5 x 5 units of corner-shared MO6 octahedra between the shear planes, giving rise to 2 nm x 2 nm blocks. Rapid lithium intercalation is observed in this new candidate battery material and 7Li pulsed field gradient nuclear magnetic resonance spectroscopy – measured in a battery electrode for the first time at room temperature – reveals superionic lithium conductivity with Li diffusivities at 298 K predominantly between 10–10 and 10–12 m2·s–1. In addition to its promising rate capability, Nb18W8O69 adds a piece to the larger picture of our understanding of high-performance Wadsley–Roth complex metal oxides.

Funding

EP/M009521/1 (EPSRC)

Winston Churchill Foundation of the United States

Herchel Smith Scholarship

History

Email Address of Submitting Author

kentjgriffith@gmail.com

Institution

University of Cambridge

Country

United Kingdom

ORCID For Submitting Author

0000-0002-8096-906X

Declaration of Conflict of Interest

K.J.G. and C.P.G. are major shareholders in a start-up company developing fast charging batteries based on high-rate anode materials.

Version Notes

Manuscript and SI v2

Licence

Exports