title: In operando observation of sodium ion diffusion in a layered sodium transition metal oxide cathode material, P2 NaxCo0.7Mn0.3O2.
abstract: In operando powder X-ray diffraction data reveals an unexpected structural evolution in a layered P2 type NaxCo0.7Mn0.3O2material during cycling. The population of single crystallographic sites sometimes increases even though sodium ions are being extracted from the structure, implying a highly cooperative diffusion mechanism. The structural evolution is shown to proceed through a series of metastable structures that cannot be predicted by thermodynamics.
authors.affiliation: Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus C, Denmark. bo@chem.au.dk.
authors.forename: Steinar
authors.identifier: http://orcid.org/0000-0003-1647-6727
authors.initials: S
authors.lastname: Birgisson
authors.affiliation: Synfuels China Technology Co. Ltd, Leyuan South Street II, No.1, Yanqi Economic Development Zone C#, Huairou District, Beijing, 101407, China.
authors.forename: Yanbin
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus C, Denmark. bo@chem.au.dk.
authors.forename: Bo B
authors.identifier: http://orcid.org/0000-0002-4632-1024
authors.initials: BB
authors.lastname: Iversen