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Title: Li MAS NMR investigation of electrochemical lithiation of RuO 2: Evidence for an interfacial storage mechanism
Authors: Bekaert, E.
Balaya, P. 
Murugavel, S.
Maier, J.
Ménétrier, M.
Issue Date: 10-Mar-2009
Citation: Bekaert, E., Balaya, P., Murugavel, S., Maier, J., Ménétrier, M. (2009-03-10). Li MAS NMR investigation of electrochemical lithiation of RuO 2: Evidence for an interfacial storage mechanism. Chemistry of Materials 21 (5) : 856-861. ScholarBank@NUS Repository.
Abstract: Nanocrystalline RuO 2 was electrochemically lithiated using a 6Li-enriched negative electrode, and selected samples at various states of lithiation-delithiation were characterized ex situ by 6Li magic-angle spinning nuclear magnetic resonance ( 6Li MAS NMR). In the first plateau (up to one Li per RuO 2), a signal with considerable shift and loss of intensity is observed, showing a strongly paramagnetic character for the LiRuO 2 phase. A signal due to solid electrolyte interphase (SEI) appears at ~0 ppm on this first plateau, but significantly grows only on the subsequent conversion plateau (from 1 to 4 Li/RuO 2). Li 2O is detected only at the very end of the latter plateau. On further lithiation (4 to 5.5 Li/RuO 2), the magnitude of the Li 2O signal remains constant, and a new signal at 4 ppm appears, that we can assign to interfacial Li hypothesized earlier in this system. Upon subsequent delithiation, NMR shows that the interfacial Li first disappears, then Li 2O also disappears, and the reconstructed Li-RuO 2 phase is clearly different from the one formed during the initial lithiation of RuO 2. Besides, the SEI signal slightly changes but does not decrease in magnitude upon delithiation. NMR results are in satisfactory agreement with the characteristic features of the proposed "job-sharing" mechanism. © 2009 American Chemical Society.
Source Title: Chemistry of Materials
ISSN: 08974756
DOI: 10.1021/cm8028005
Appears in Collections:Staff Publications

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