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Short-Range Ordering in Battery Electrode, the ‘Cation-Disordered’ Rocksalt Li1.25Nb0.25Mn0.5O2

preprint
submitted on 03.06.2019 and posted on 04.06.2019 by Michael Jones, Philip J. Reeves, Ieuan D. Seymour, Matthew J. Cliffe, Siân E. Dutton, Clare P. Grey
We show the occurrence of local cation ordering in Li-ion battery material Li1.25Nb0.25Mn0.5O2, previously thought to be disordered. We deduce this ordering from X-ray diffraction, and test it against neutron diffraction & PDF, magnetic susceptibility and solid state NMR evidence. We identify the nature of the ordering as having a local structure related to that of gamma-LiFeO2, determine the correlation length of such ordering, and demonstrate its significant consequences for the material's electrochemistry.

Funding

EPSRC Centre for Doctoral Training in Sustainable and Functional Nano

Engineering and Physical Sciences Research Council

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NorthEast Center for Chemical Energy Storage (NECCES)

Basic Energy Sciences

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History

Email Address of Submitting Author

maj62@cam.ac.uk

Institution

University of Cambridge, Department of Chemistry

Country

United Kingdom

ORCID For Submitting Author

0000-0002-6730-9964

Declaration of Conflict of Interest

No conflicts of interest to declare.

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