The spinel compound Li 4/3+xTi 5/3O 4 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).
Lithium-7 nuclear magnetic resonance and Ti K-edge X-ray absorption spectroscopic investigation of electrochemical lithium insertion in Li4/3+xTi5/3O4 / F., Ronci; P. E., Stallworth; F., Alamgir; T., Schiros; J., VAN SLUYTMAN; X., Guo; Reale, Priscilla; S., Greenbaum; M., DEN BOER; Scrosati, Bruno. - In: JOURNAL OF POWER SOURCES. - ISSN 0378-7753. - STAMPA. - 119-121(2003), pp. 631-636. [10.1016/S0378-7753(03)00191-5]
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Titolo: | Lithium-7 nuclear magnetic resonance and Ti K-edge X-ray absorption spectroscopic investigation of electrochemical lithium insertion in Li4/3+xTi5/3O4 | |
Autori: | ||
Data di pubblicazione: | 2003 | |
Rivista: | ||
Citazione: | Lithium-7 nuclear magnetic resonance and Ti K-edge X-ray absorption spectroscopic investigation of electrochemical lithium insertion in Li4/3+xTi5/3O4 / F., Ronci; P. E., Stallworth; F., Alamgir; T., Schiros; J., VAN SLUYTMAN; X., Guo; Reale, Priscilla; S., Greenbaum; M., DEN BOER; Scrosati, Bruno. - In: JOURNAL OF POWER SOURCES. - ISSN 0378-7753. - STAMPA. - 119-121(2003), pp. 631-636. [10.1016/S0378-7753(03)00191-5] | |
Handle: | http://hdl.handle.net/11573/341970 | |
Appartiene alla tipologia: | 01a Articolo in rivista |