Journal
SOLID STATE IONICS
Volume 199, Issue -, Pages 37-43Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2011.07.015
Keywords
In-situ neutron diffraction; Li-ion batteries; Energy-storage; Time-dependent studies; Ex-situ diffraction
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Funding
- Australian Research Council (ARC) [DP0878611]
- Australian Research Council [DP0878611] Funding Source: Australian Research Council
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This work presents the first in-situ neutron diffraction study of the MoS2 electrode, undertaken in a custom-built Li-ion battery during discharge. A review of custom-designed cells for in-situ neutron diffraction experiments is presented along with our optimised cell, which we use to show real-time information corresponding to Li-insertion into MoS2 via disappearance of the (103) reflection and increase in the d-spacing of the (002) reflection. The changes in the diffraction patterns begin at the 1.1 V plateau and are complete during the 0.5 V plateau. Sequential Rietveld-refinement indicates the presence of an intermediate lithiated phase (LixMoS2) between MoS2 and LiMoS2. We observe the disappearance of all reflections for the MoS2, corresponding to the loss of long-range order, during the 0.5 V plateau and no new diffraction peaks appear with further electrochemical cycling. This result is indicative of a transformation from long-range ordered MoS2 to short-range ordered LiMoS2, a result that we confirm using ex-situ synchrotron X-ray and neutron diffraction. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
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