HONG, Young-Sik; HAN, Chi-Hwan; KIM, Keon; KWON, Chai-Won; CAMPET, Guy; CHOY, Jin-Ho

doi:10.1016/S0167-2738(00)00821-3

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

HONG, Young-Sik
Department of Chemistry

HAN, Chi-Hwan
Department of Chemistry

KIM, Keon
Department of Chemistry

Langue

Article de revue

Ce document a été publié dans

Solid State Ionics. 2001, vol. 139, n° 1-2, p. 75-81

Elsevier

Résumé en anglais

The Li+/Co3+-codoped LiMn2O4 spinel was prepared using two-step synthesis method consisting of solid-state reaction method and citrate modified sol–gel method, in order to investigate the changes of the electrochemical properties of the spinel LiMn2O4 on the amount of Li+/Co3+ ions. The FT-infrared spectra, chemical analysis, and Rietveld refinements of their XRD data revealed that the manganese ions in the 16d sites were replaced by both lithium and cobalt ions. Thus, the composition of obtained powders could be expressed as the new spinel formula (Li)[Mn2−xLix/4Co3x/4]O4, that is, (Li)[Mn3+1−3x/2Mn4+1+x/2Lix/4Co3+3x/4]O4. The inclusion of lithium and cobalt ions in 16d sites enhanced the electrochemical cyclability of LiMn2O4 at the expense of a reduction in the initial charge capacity. The improvement in cycling performance was mainly attributed to the suppression of Jahn–Teller distortion as shown in (Li)[Mn2−xLix]O4 and (Li)[Mn2−xCox]O4.< Réduire

Métadonnées

Licence d’utilisation du document

Structural and electrochemical properties of the spinel Li(Mn2−xLix/4Co3x/4)O4

Langue

Ce document a été publié dans

Résumé en anglais

DOI

Origine

Unités de recherche