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Lithium-7 nuclear magnetic resonance and Ti K-edge X-ray absorption spectroscopic investigation of electrochemical lithium insertion in Li4/3+xTi5/3O4

TitleLithium-7 nuclear magnetic resonance and Ti K-edge X-ray absorption spectroscopic investigation of electrochemical lithium insertion in Li4/3+xTi5/3O4
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2003
AuthorsRonci, F., Stallworth P.E., Alamgir F., Schiros T., Van Sluytman J., Guo X., Reale P., Greenbaum S., DenBoer M., and Scrosati B.
JournalJournal of Power Sources
Volume119-121
Pagination631-636
ISSN03787753
KeywordsElectrochemistry, Intercalation compounds, Lattice constants, Lithium compounds, Nuclear magnetic resonance spectroscopy, Titanium, X ray diffraction analysis, X-ray absorption fine structures (XAFS)
Abstract

The spinel compound Li4/3+xTi5/3O4 is known to undergo reversible lithium intercalation up to x=1 with almost no change in lattice parameters, hence its designation as a "zero strain" intercalation compound. Structural changes that accompany electrochemical Li intercalation into this compound were studied by both 7Li nuclear magnetic resonance (NMR) and Ti K-edge X-ray absorption fine structure (XAFS). The NMR results demonstrate that Li occupancies do not follow a simple distribution between two possible sites, one tetrahedral and one octahedral. The presence of at least one additional octahedral site is suggested. Line width measurements show that the Li+ ions do not return to their original distribution after cycling. XAFS results indicate the presence of modest static disorder in Ti-O and Ti-Ti distances above x = 0.5. Both methods thus reveal subtle structural details previously unobserved by X-ray diffraction (XRD). © 2003 Elsevier Science B.V. All rights reserved.

Notes

cited By 16; Conference of Selected Papers Presented at the 11th IMLB ; Conference Date: 22 June 2002 Through 28 June 2002; Conference Code:61111

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0038746684&doi=10.1016%2fS0378-7753%2803%2900191-5&partnerID=40&md5=7d13df8627c8507bc6b3809eaacefc0a
DOI10.1016/S0378-7753(03)00191-5
Citation KeyRonci2003631