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Potassium-ion intercalation in graphite within a potassium-ion battery examined using in situ X-ray diffraction

Published online by Cambridge University Press:  04 September 2017

James C. Pramudita
Affiliation:
School of Chemistry, UNSW Australia, Sydney NSW 2052, Australia Australia Nuclear Science and Technology Organisation, Kirrawee, DC NSW 2253, Australia
Vanessa K. Peterson*
Affiliation:
Australia Nuclear Science and Technology Organisation, Kirrawee, DC NSW 2253, Australia Institute for Superconducting and Electronic Materials, Faculty of Engineering, School of Mechanical, Materials, and Mechatronic Engineering, University of Wollongong, NSW 2522, Australia
Justin A. Kimpton
Affiliation:
Australian Synchrotron, 800 Blackburn Road Clayton, VIC 3168, Australia
Neeraj Sharma
Affiliation:
School of Chemistry, UNSW Australia, Sydney NSW 2052, Australia
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]

Abstract

Graphite has been widely used as a negative electrode material in lithium-ion batteries, and recently it has attracted attention for its use in potassium-ion batteries. In this study, the first in situ X-ray diffraction characterisation of a K/graphite electrochemical cell is performed. Various graphite intercalation compounds are found, including the stage three KC36 and stage one KC8 compounds, along with the disappearance of the graphite during the potassiation process. These results show new insights on the non-equilibrium states of potassium-ion intercalation into graphite in K/graphite electrochemical cells.

Type
Technical Articles
Copyright
Copyright © International Centre for Diffraction Data 2017 

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