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Structure-Stability Correlations in Li-ion Battery Cathode Materials

Published online by Cambridge University Press:  12 May 2014

Christopher Patridge ,
Corey Love ,
Wojtek Dmowski ,
David Ramaker ,
Michelle Johannes  and
Karen Swider-Lyons
Christopher Patridge
Affiliation:
Chemistry Dept., D’youville College, Buffalo, NY 14201
Corey Love
Affiliation:
Chemistry Division, U.S. Naval Research Laboratory, Washington DC 20375
Wojtek Dmowski
Affiliation:
Department of Materials Science, University of Tennessee, Knoxville, TN 37996
David Ramaker
Affiliation:
Chemistry Division, U.S. Naval Research Laboratory, Washington DC 20375
Michelle Johannes
Affiliation:
Center for Computational Materials Science, U.S. Naval Research Laboratory, Washington DC 20375
Karen Swider-Lyons
Affiliation:
Chemistry Division, U.S. Naval Research Laboratory, Washington DC 20375
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Abstract

Detailed structural studies of two lithiated metal oxides, Li2CuO2 and nanoscale LiCoO2, have been carried out using ex situ high-energy X-ray diffraction (XRD) and in situ X-ray absorption spectroscopy (XAS) with the objective of understanding structural changes that might cause capacity loss during cycling. XRD on the cuprate was studied at various states of charge and phase composition, and the bulk state was determined by Rietveld refinement and pair density function (PDF) analysis. Results showed a largely irreversible structural change of the material upon oxidation of Cu2+ as well as CuO formation. The in-situ XAS of the LiCoO2 was analyzed through a difference method to extract the changes in the local structure that occur upon cycling in both the near edge (XANES) and extended region (EXAFS). Results suggest that cycling causes site exchange of the Co and Li ions near the surface of the nanoscale LiCoO2.

Keywords

oxidex-ray diffraction (XRD)extended x-ray absorption fine structure(EXAFS)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1655: Symposium OO – Solid-State Chemistry of Inorganic Materials , 2014 , mrsf13-1655-oo07-05
Copyright
Copyright © Materials Research Society 2014 

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References

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