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Krogstad, Matthew J; Rosenkranz, Stephan; Wozniak, Justin M; Jennings, Guy; Ruff, Jacob P C; Vaughey, John T; Osborn, Raymond
Nature materials, 01/2020, Letnik: 19, Številka: 1Journal Article
The intercalation of alkali ions into layered materials has played an essential role in battery technology since the development of the first lithium-ion electrodes. Coulomb repulsion between the intercalants leads to ordering of the intercalant sublattice, which hinders ionic diffusion and impacts battery performance. While conventional diffraction can identify the long-range order that can occur at discrete intercalant concentrations during the charging cycle, it cannot determine short-range order at other concentrations that also disrupt ionic mobility. In this Article, we show that the use of real-space transforms of single-crystal diffuse scattering, measured with high-energy synchrotron X-rays, allows a model-independent measurement of the temperature dependence of the length scale of ionic correlations along each of the crystallographic axes in sodium-intercalated V O . The techniques described here provide a new way of probing the evolution of structural ordering in crystalline materials.
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