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Lithium Intercalation into Graphitic Carbons Revisited: Experimental Evidence for Twisted Bilayer Behavior

Senyshyn, Anatoliy and Dolotko, O. and Mühlbauer, M. J. and Nikolowski, Kristian and Fuess, Hartmut and Ehrenberg, Helmut (2013):
Lithium Intercalation into Graphitic Carbons Revisited: Experimental Evidence for Twisted Bilayer Behavior.
In: Journal of the Electrochemical Society, pp. A3198-A3205, 160, (5), ISSN 0013-4651, [Online-Edition: http://dx.doi.org/10.1149/2.031305jes],
[Article]

Abstract

The crystal structure of the 18650-type Li-ion cell constituents has been studied at ambient temperature by high-resolution neutron powder diffraction at different states of charge. The structure evolution occurring on the anode (graphite) site as a function of the cell state has been accurately monitored by simultaneous electrochemical measurements and powder diffraction. A set of 128 neutron powder diffraction patterns each over a 2θ angular range of 0.95°–160° has been collected during slow cell discharge/charge in a high-resolution mode. Severe deviations from the previously reported details of Li-intercalation into graphite have been observed, such as: structural evolution of the intercalated carbons depending either on charge or discharge; pronounced dependence of the interatomic spacings for the higher ordered LixC6 (incl. previously unknown ones). Instead of higher stages of Li-intercalation in the region of low Li-contents, which would have been observed by Bragg reflections at low 2θ angles, a modulation within the ab-planes is proposed, which is correlated between neighboured graphene layers and changes in dependence of the Li-content. On the basis of these results the phase diagram for lithium-intercalated carbons has been reconsidered and the alternative ordering model for the LixC6 (x < 0.5) has been proposed.

Item Type: Article
Erschienen: 2013
Creators: Senyshyn, Anatoliy and Dolotko, O. and Mühlbauer, M. J. and Nikolowski, Kristian and Fuess, Hartmut and Ehrenberg, Helmut
Title: Lithium Intercalation into Graphitic Carbons Revisited: Experimental Evidence for Twisted Bilayer Behavior
Language: English
Abstract:

The crystal structure of the 18650-type Li-ion cell constituents has been studied at ambient temperature by high-resolution neutron powder diffraction at different states of charge. The structure evolution occurring on the anode (graphite) site as a function of the cell state has been accurately monitored by simultaneous electrochemical measurements and powder diffraction. A set of 128 neutron powder diffraction patterns each over a 2θ angular range of 0.95°–160° has been collected during slow cell discharge/charge in a high-resolution mode. Severe deviations from the previously reported details of Li-intercalation into graphite have been observed, such as: structural evolution of the intercalated carbons depending either on charge or discharge; pronounced dependence of the interatomic spacings for the higher ordered LixC6 (incl. previously unknown ones). Instead of higher stages of Li-intercalation in the region of low Li-contents, which would have been observed by Bragg reflections at low 2θ angles, a modulation within the ab-planes is proposed, which is correlated between neighboured graphene layers and changes in dependence of the Li-content. On the basis of these results the phase diagram for lithium-intercalated carbons has been reconsidered and the alternative ordering model for the LixC6 (x < 0.5) has been proposed.

Journal or Publication Title: Journal of the Electrochemical Society
Volume: 160
Number: 5
Divisions: DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > T - Transfer projects > Subproject T1: in operando“ studies of materials fatigue in commercial battery-types by neutron tomography and diffraction
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > T - Transfer projects
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 13 May 2013 08:33
Official URL: http://dx.doi.org/10.1149/2.031305jes
Additional Information:

SFB 595 T1

Identification Number: doi:10.1149/2.031305jes
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