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Titolo:
Crystallization kinetics and mechanism of the LixNi2-xO2 (0 < x <= 1) fromLi2CO3 and NiO
Autore:
Lin, SP; Fung, KZ; Hon, YM; Hon, MH;
Indirizzi:
Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 70101, Taiwan Natl ChengKung Univ Tainan Taiwan 70101 ci & Engn, Tainan 70101, Taiwan
Titolo Testata:
JOURNAL OF CRYSTAL GROWTH
fascicolo: 1, volume: 234, anno: 2002,
pagine: 176 - 183
SICI:
0022-0248(200201)234:1<176:CKAMOT>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
NICKEL-OXIDE CATHODES; CARBONATE FUEL-CELLS; LITHIUM BATTERIES; LINIO2; PHASE; LIXNI1-XO;
Keywords:
solid solutions; X-ray diffraction; oxides; electroceramic materials;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Fung, KZ Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 70101, Taiwan Natl Cheng Kung Univ Tainan Taiwan 70101 , Tainan 70101, Taiwan
Citazione:
S.P. Lin et al., "Crystallization kinetics and mechanism of the LixNi2-xO2 (0 < x <= 1) fromLi2CO3 and NiO", J CRYST GR, 234(1), 2002, pp. 176-183

Abstract

LiNiO2 is known to be the potential material to replace expensive LiCoO2 cathode in lithium-secondary battery. Kinetics and mechanism of the LixNi2-xO2 (0 <x less than or equal to1) reacted from Li2CO3 and NiO were investigated by X-ray diffraction (XRD), SEM in this study. The formation of LixNi2-xO2 was found to be a thermally activated process, which can be representedas the Jander model [1 - (1-alpha)(1/3)](2) = kt and the reaction activation energy is estimated to be about 190 kJ/mol. The formation of LixNi2-xO2 Can be viewed as the combination of two reactions: (1) the oxidation of nickel (II) to nickel (III) accompanied by the creation of cation vacancies and followed by (2) the filling of lithium ions into the cation vacancies created. Based on the result of kinetics study in this work, the rate-determining step is considered to be the creation of nickel vacancies and can be described as 1/2O(2) ((NiO)) over right arrow V-Ni" + 2h(.) + O-0(x) (C) 2002Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 21:03:03