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

04 June 2019, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

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.

Keywords

Diffraction
x-ray
neutron
Li-ion battery materials
Solid state NMR
Magnetic susceptibilities
PDF analysis

Supplementary materials

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Michael Jones Short Range Ordering ESI 20190602
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