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Understanding structural changes in NMC Li-ion cells by in situ neutron diffraction

Dolotko, O. and Senyshyn, Anatoliy and Mühlbauer, M. J. and Nikolowski, Kristian and Ehrenberg, Helmut (2014):
Understanding structural changes in NMC Li-ion cells by in situ neutron diffraction.
In: Journal of Power Sources, pp. 197-203, 255, ISSN 03787753, [Online-Edition: http://dx.doi.org/10.1016/j.jpowsour.2014.01.010],
[Article]

Abstract

Commercial NMC cells of 18650-type based on a Lix(Ni0.5Mn0.3Co0.2)O2 cathode and a graphitic anode were studied in situ using a combination of high-resolution monochromatic neutron powder diffraction and electrochemical analysis. The structural changes of the electrode materials during cell charge/discharge have been determined using Rietveld refinement and single profile decomposition techniques. A transformation of the graphitic anode to LiC12 and LiC6 through the formation of higher ordered lithium intercalated carbons was observed. A different behavior of electrochemically-driven lattice distortion was observed for NMC material in comparison to LixCoO2 and its influence on the overall cell performance has been discussed in brief. Detailed analysis of the structural changes in the Lix(Ni0.5Mn0.3Co0.2)O2 cathode material revealed reversible Li/Ni cation mixing (5.6(8)%), which is state-of-charge independent below 1600 mAh and vanishing above 1800 mAh (∼0.8Qmax).

Item Type: Article
Erschienen: 2014
Creators: Dolotko, O. and Senyshyn, Anatoliy and Mühlbauer, M. J. and Nikolowski, Kristian and Ehrenberg, Helmut
Title: Understanding structural changes in NMC Li-ion cells by in situ neutron diffraction
Language: English
Abstract:

Commercial NMC cells of 18650-type based on a Lix(Ni0.5Mn0.3Co0.2)O2 cathode and a graphitic anode were studied in situ using a combination of high-resolution monochromatic neutron powder diffraction and electrochemical analysis. The structural changes of the electrode materials during cell charge/discharge have been determined using Rietveld refinement and single profile decomposition techniques. A transformation of the graphitic anode to LiC12 and LiC6 through the formation of higher ordered lithium intercalated carbons was observed. A different behavior of electrochemically-driven lattice distortion was observed for NMC material in comparison to LixCoO2 and its influence on the overall cell performance has been discussed in brief. Detailed analysis of the structural changes in the Lix(Ni0.5Mn0.3Co0.2)O2 cathode material revealed reversible Li/Ni cation mixing (5.6(8)%), which is state-of-charge independent below 1600 mAh and vanishing above 1800 mAh (∼0.8Qmax).

Journal or Publication Title: Journal of Power Sources
Volume: 255
Uncontrolled Keywords: Li-ion; NMC cell; In situ study; Electrodes; Neutron powder diffraction
Divisions: Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
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 > 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
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 28 Apr 2014 09:40
Official URL: http://dx.doi.org/10.1016/j.jpowsour.2014.01.010
Additional Information:

SFB 595 T2

Identification Number: doi:10.1016/j.jpowsour.2014.01.010
Funders: This work is financially supported by the Deutsche Forschungsgemeinschaft DFG as part of the Research Collaborative Centre 595 “Electrical fatigue in functional materials”. The authors thank to Andrea Voss (Institute for Complex Materials, IFW Dresden) fo
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