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Titolo:
Variation of the chemical bonding nature of LiMn2-xNixO4 spinel oxides upon delithiation and lithiation reactions
Autore:
Hwang, SJ; Park, HS; Choy, JH; Campet, G;
Indirizzi:
Seoul Natl Univ, Sch Chem & Mol Engn, Natl Nanohybrid Mat Lab, Seoul 151747, South Korea Seoul Natl Univ Seoul South Korea 151747 Lab, Seoul 151747, South Korea CNRS, Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France CNRS Pessac France F-33608 at Condensee Bordeaux, F-33608 Pessac, France
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 1, volume: 105, anno: 2001,
pagine: 335 - 342
SICI:
1520-6106(20010111)105:1<335:VOTCBN>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
ABSORPTION FINE-STRUCTURE; LITHIUM BATTERIES; CATHODE MATERIAL; LIMN2O4; CELLS; TRANSITION; INSERTION; LINIO2; PHASE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Choy, JH Seoul Natl Univ, Sch Chem & Mol Engn, Natl Nanohybrid Mat Lab, Seoul 151747, South Korea Seoul Natl Univ Seoul South Korea 151747 ul 151747, South Korea
Citazione:
S.J. Hwang et al., "Variation of the chemical bonding nature of LiMn2-xNixO4 spinel oxides upon delithiation and lithiation reactions", J PHYS CH B, 105(1), 2001, pp. 335-342

Abstract

The effect of nickel substitution on the chemical bonding nature of spinellithium manganate has been investigated by performing comparative X-ray absorption spectroscopic analyses for Ni- and Cr-substituted LiMn2-xMx O-4 (M= Ni and Cr) compounds. The Mn K-edge X-ray absorption spectroscopic results presented here clarify that the replacement of Mn with Ni or Cr gives' rise not only to the increase of the Mn oxidation state but also to the suppression of the tetragonal distortion in cubic spinel lattice. From the extended X-ray absorption fine structure analyses at the Ni and Cr K-edges, it has been confirmed that the substitution of nickel ion induces lower structural stability of the spinel lattice compared to that of chromium ion. Especially for the lithiated spinel phase, a remarkable tetragonal distortion is observed for the Ni-substituted case in contrast to the Cr-substituted one. On the basis of the present experimental findings, it is concluded that the substitution of Mn with Ni is less effective in stabilizing the cubic spinel lattice than that with Cr, which is responsible for the inferior electrochemical performance of LiMn2-x,NixO4.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 18:15:26