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Why Structure Matters:: How Crystallography Can Make an Impact on the Advancement of Energy Storage
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0002-8658-8938
2018 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

More than ever before there is a strong drive to improve or find new ways of storing energy. Despite the growing demand for better batteries, improvements are usually slow. This is in part due to the slow discovery of new structures for positive and negative electrodes followed by the extreme difficulty in scaling up and commercializing those new materials. That is, while the crystalline electrodes play a huge role in determining the theoretical performance of a battery, actual performance of a full cell comes from the complex interactions between all the components. Thus, improving battery design is a hugely challenging and multidisciplinary task. However, building a picture of how the other cell components influence the overall performance can significantly benefit from using structural markers of the electrodes, such as cell parameters or phase distributions. Monitoring these can serve as a diagnostic for aging, current distributions, reaction homogeneity and mobile cation inventory, among other important factors. This talk will focus on the detailed structural investigation of two different positive electrode materials: LiFeSO4F and Na2-xFe[Fe(CN)6]y.zH2O. For LiFeSO4F, there is an asymmetry between the lithium insertion and extraction reaction which then influences the distribution of phases during battery cycling and at different battery cycling rates [1].  The distribution of these phases provides insight to the effect different sources of resistance in the electrode have on reaction homogeneity. Na2-xFe[Fe(CN)6]y.zH2O, is a promising new high rate positive electrode material for sodium ion batteries whose synthesis and performance is typically challenging to understand and reproduce. Thus, in addition to all the complexity of multiple interacting components in a sodium ion battery, the material itself can vary markedly from synthesis to synthesis. Given the large range of reported electrochemical properties in the literature it is clear that a complete structural and morphological description of the material is vital. In this presentation some of the efforts in our group on understanding Prussian White will be covered. In summary this talk will demonstrate how understanding crystal structure is important for both controlling fundamental properties from an atomic scale to aiding in effective battery engineering on a macroscopic length scale.

Place, publisher, year, edition, pages
2018.
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-376558OAI: oai:DiVA.org:uu-376558DiVA, id: diva2:1286382
Conference
ILL and ESS European Users Meeting, October 10-12, 2018, Grenoble, France
Available from: 2019-02-06 Created: 2019-02-06 Last updated: 2019-09-30Bibliographically approved

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Brant, William

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