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  • Rate Dependent Performance Related to Crystal Structure Evolution 2 of Na0.67Mn0.8Mg0.2O2 in a Sodium-Ion Battery

    Rights statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright ©2015 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021%2Facs.chemmater.5b02142

    Accepted author manuscript, 4.14 MB, PDF document

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

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Rate Dependent Performance Related to Crystal Structure Evolution of Na0.67Mn0.8Mg0.2O2 in a Sodium-Ion Battery

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  • Neeraj Sharma
  • Nuria Tapia-Ruiz
  • Gurpreet Singh
  • A. Robert Armstrong
  • James C. Pramudita
  • Helen E. A. Brand
  • Juliette Billaud
  • Peter G. Bruce
  • Teofilo Rojo
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<mark>Journal publication date</mark>27/10/2015
<mark>Journal</mark>Chemistry of Materials
Issue number20
Volume27
Number of pages11
Pages (from-to)6976-6986
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Sodium-ion batteries are considered as a favorable alternative to the widely used lithium-ion batteries for applications such as grid-scale energy storage. However, to meet the energy density and reliability that is necessary, electrodes that are structurally stable and well characterized during electrochemical cycling need to be developed. Here, we report on how the applied discharge current rate influences the structural evolution of Na0.67Mn0.8Mg0.2O2 electrode materials. A combination of ex situ and in situ X-ray diffraction (XRD) data were used to probe the structural transitions at the discharged state and during charge/discharge. Ex situ data shows a two-phase electrode at the discharged state comprised of phases that adopt Cmcm and P63/mmc symmetries at the 100 mA/g rate but a predominantly P63/mmc electrode at 200 and 400 mA/g rates. In situ synchrotron XRD data at 100 mA/g shows a solely P63/mmc electrode when 12 mA/g charge and 100 mA/g discharge is used even though ex situ XRD data shows the p...

Bibliographic note

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright ©2015 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021%2Facs.chemmater.5b02142