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

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.


EP/M009521/1 (EPSRC)

Winston Churchill Foundation of the United States

Herchel Smith Scholarship


Email Address of Submitting Author


University of Cambridge


United Kingdom

ORCID For Submitting Author


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