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

Young Sik Hong, Chi Hwan Han, Keon Kim, Chai Won Kwon, Guy Campet, Jin Ho Choy

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

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)[Mn1-3x/2 3+Mn1+x/2 4+ Lix/4 Co3x/4 3+]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.

Original languageEnglish
Pages (from-to)75-81
Number of pages7
JournalSolid State Ionics
Volume139
Issue number1-2
DOIs
Publication statusPublished - 2001 Jan 2

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Electrochemical properties
spinel
Structural properties
Ions
cobalt
lithium
Cobalt
Lithium
manganese ions
ions
citrates
chemical analysis
Jahn-Teller effect
Rietveld refinement
infrared spectra
Manganese
Chemical analysis
Solid state reactions
retarding
Citric Acid

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Structural and electrochemical properties of the spinel Li(Mn2-xLix/4Co3x/4)O4 . / Hong, Young Sik; Han, Chi Hwan; Kim, Keon; Kwon, Chai Won; Campet, Guy; Choy, Jin Ho.

In: Solid State Ionics, Vol. 139, No. 1-2, 02.01.2001, p. 75-81.

Research output: Contribution to journalArticle

Hong, Young Sik ; Han, Chi Hwan ; Kim, Keon ; Kwon, Chai Won ; Campet, Guy ; Choy, Jin Ho. / Structural and electrochemical properties of the spinel Li(Mn2-xLix/4Co3x/4)O4 In: Solid State Ionics. 2001 ; Vol. 139, No. 1-2. pp. 75-81.
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