Variation of chemical bonding nature of layered LiMnO2 upon delithiation/relithiation and Cr substitution

Seong Ju Hwang, Hyo Suk Park, Jin Ho Choy

Research output: Contribution to journalConference article

19 Citations (Scopus)

Abstract

X-ray absorption spectroscopic (XAS) and micro-Raman analyses have been performed to investigate the effect of delithiation/relithiation reaction on the electronic and crystal structures of layered LiMnO2. From the spectroscopic results presented here, it becomes clear that the local structure around manganese in LiMnO2 is changed from a layered α-NaFeO2-type structure to a spinel-like one upon Li deintercalation-intercalation reaction. Such results highlight the lattice instability of layered manganese oxide for the extraction of interlayer lithium, which is responsible for the remarkable capacity fading. On the basis of the present experimental findings, we have prepared the chromium-substituted LiMn1-xCrxO2 (0≤x≤0.15) oxides to improve the electrochemical performance of layered lithium manganate. As expected, the electrochemical measurements clarify that the Cr-substituted compounds possess better electrochemical properties than the pristine LiMnO2. According to the XAS and micro-Raman studies for these compounds, it is found that the trivalent chromium ions are fixed to the octahedral site of MnO2 layer before and after electrochemical charge-discharge process, and that the manganese ion can be stabilized through the shortening of (Mn-O) bond distances. In this regard, the improved electrochemical performance of LiMn1-xCrxO2 is surely attributed to the stabilization of layered lithium manganate lattice upon replacement of Mn with Cr.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalSolid State Ionics
Volume151
Issue number1-4
DOIs
Publication statusPublished - 2002 Nov 1
EventSSP- 2000 - Tokyo, Japan
Duration: 2000 Dec 112000 Dec 13

Fingerprint

Lithium
Substitution reactions
lithium
X ray absorption
Chromium
substitutes
Manganese
chromium
Ions
manganese ions
Manganese oxide
manganese oxides
fading
Intercalation
Electrochemical properties
intercalation
Oxides
spinel
Electronic structure
manganese

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Variation of chemical bonding nature of layered LiMnO2 upon delithiation/relithiation and Cr substitution",
abstract = "X-ray absorption spectroscopic (XAS) and micro-Raman analyses have been performed to investigate the effect of delithiation/relithiation reaction on the electronic and crystal structures of layered LiMnO2. From the spectroscopic results presented here, it becomes clear that the local structure around manganese in LiMnO2 is changed from a layered α-NaFeO2-type structure to a spinel-like one upon Li deintercalation-intercalation reaction. Such results highlight the lattice instability of layered manganese oxide for the extraction of interlayer lithium, which is responsible for the remarkable capacity fading. On the basis of the present experimental findings, we have prepared the chromium-substituted LiMn1-xCrxO2 (0≤x≤0.15) oxides to improve the electrochemical performance of layered lithium manganate. As expected, the electrochemical measurements clarify that the Cr-substituted compounds possess better electrochemical properties than the pristine LiMnO2. According to the XAS and micro-Raman studies for these compounds, it is found that the trivalent chromium ions are fixed to the octahedral site of MnO2 layer before and after electrochemical charge-discharge process, and that the manganese ion can be stabilized through the shortening of (Mn-O) bond distances. In this regard, the improved electrochemical performance of LiMn1-xCrxO2 is surely attributed to the stabilization of layered lithium manganate lattice upon replacement of Mn with Cr.",
author = "Hwang, {Seong Ju} and Park, {Hyo Suk} and Choy, {Jin Ho}",
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Variation of chemical bonding nature of layered LiMnO2 upon delithiation/relithiation and Cr substitution. / Hwang, Seong Ju; Park, Hyo Suk; Choy, Jin Ho.

In: Solid State Ionics, Vol. 151, No. 1-4, 01.11.2002, p. 275-283.

Research output: Contribution to journalConference article

TY - JOUR

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AU - Hwang, Seong Ju

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AU - Choy, Jin Ho

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N2 - X-ray absorption spectroscopic (XAS) and micro-Raman analyses have been performed to investigate the effect of delithiation/relithiation reaction on the electronic and crystal structures of layered LiMnO2. From the spectroscopic results presented here, it becomes clear that the local structure around manganese in LiMnO2 is changed from a layered α-NaFeO2-type structure to a spinel-like one upon Li deintercalation-intercalation reaction. Such results highlight the lattice instability of layered manganese oxide for the extraction of interlayer lithium, which is responsible for the remarkable capacity fading. On the basis of the present experimental findings, we have prepared the chromium-substituted LiMn1-xCrxO2 (0≤x≤0.15) oxides to improve the electrochemical performance of layered lithium manganate. As expected, the electrochemical measurements clarify that the Cr-substituted compounds possess better electrochemical properties than the pristine LiMnO2. According to the XAS and micro-Raman studies for these compounds, it is found that the trivalent chromium ions are fixed to the octahedral site of MnO2 layer before and after electrochemical charge-discharge process, and that the manganese ion can be stabilized through the shortening of (Mn-O) bond distances. In this regard, the improved electrochemical performance of LiMn1-xCrxO2 is surely attributed to the stabilization of layered lithium manganate lattice upon replacement of Mn with Cr.

AB - X-ray absorption spectroscopic (XAS) and micro-Raman analyses have been performed to investigate the effect of delithiation/relithiation reaction on the electronic and crystal structures of layered LiMnO2. From the spectroscopic results presented here, it becomes clear that the local structure around manganese in LiMnO2 is changed from a layered α-NaFeO2-type structure to a spinel-like one upon Li deintercalation-intercalation reaction. Such results highlight the lattice instability of layered manganese oxide for the extraction of interlayer lithium, which is responsible for the remarkable capacity fading. On the basis of the present experimental findings, we have prepared the chromium-substituted LiMn1-xCrxO2 (0≤x≤0.15) oxides to improve the electrochemical performance of layered lithium manganate. As expected, the electrochemical measurements clarify that the Cr-substituted compounds possess better electrochemical properties than the pristine LiMnO2. According to the XAS and micro-Raman studies for these compounds, it is found that the trivalent chromium ions are fixed to the octahedral site of MnO2 layer before and after electrochemical charge-discharge process, and that the manganese ion can be stabilized through the shortening of (Mn-O) bond distances. In this regard, the improved electrochemical performance of LiMn1-xCrxO2 is surely attributed to the stabilization of layered lithium manganate lattice upon replacement of Mn with Cr.

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