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Titolo:
LI-7 NMR-STUDY OF LI-DOPED POLYACENIC SEMICONDUCTOR (PAS) MATERIALS
Autore:
AGO H; TANAKA K; YAMABE T; TAKEGOSHI K; TERAO T; YATA S; HATO Y; ANDO N;
Indirizzi:
KYOTO UNIV,GRAD SCH ENGN,DEPT MOL ENGN,SAKYO KU KYOTO 60601 JAPAN KYOTO UNIV,GRAD SCH ENGN,DEPT MOL ENGN,SAKYO KU KYOTO 60601 JAPAN KYOTO UNIV,GRAD SCH SCI,DEPT CHEM,SAKYO KU KYOTO 606 JAPAN KANEBO LTD,BATTERY BUSINESS PROMOT,MIYAKOJIMA KU OSAKA 534 JAPAN
Titolo Testata:
Synthetic metals
fascicolo: 2, volume: 89, anno: 1997,
pagine: 141 - 147
SICI:
0379-6779(1997)89:2<141:LNOLPS>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
ION RECHARGEABLE BATTERIES; LITHIUM INSERTION; DISORDERED CARBON; PRISTINE; MECHANISM; RESONANCE; ELECTRON;
Keywords:
POLYACENIC SEMICONDUCTORS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; BATTERIES; LITHIUM DOPING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
H. Ago et al., "LI-7 NMR-STUDY OF LI-DOPED POLYACENIC SEMICONDUCTOR (PAS) MATERIALS", Synthetic metals, 89(2), 1997, pp. 141-147

Abstract

The polyacenic semiconductor (PAS) material prepared from phenol resin at relatively low temperature (680 degrees C) can be doped by a muchlarger amount of lithium atoms up to the C2Li state compared with graphite (C6Li state). To understand the Li storage mechanism as well as the electronic structure, Li-7 nuclear magnetic resonance (NMR) measurements have been performed for the Li-doped PAS materials. In the initial doping stage a broad signal was observed at 0 ppm, while the successive doping causes a Knight shift to 9 ppm. It is suggested from thisKnight shift that the Li nucleus slightly undergoes the Fermi contactinteraction with conduction electrons delocalizing through carbon pi-atomic orbitals. From the spin-lattice relaxation rate (1/T)(1) it is found that the Li nucleus in the PAS material loses its mobility by the surrounding Li nuclei with the proceeding doping and that the Li nucleus is more loosely trapped than that in the C6Li state of graphite. (C) 1997 Elsevier Science S.A.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/21 alle ore 09:02:04