Oxygen stoichiometry-structure-property correlations in Li2/3 [Mn2/3Ni1/3]O2-δ with O3 structure

D. Pasero, N. Reeves, L. Gillie, V. Pralong, A. R. West

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The layered rock salt material Li23 [Mn23 Ni13] O2-δ with the O3 structure loses up to 16 2 3 % of its oxygen reversibly at high temperature. It transforms initially to a second layered structure, O 3′, that may be associated with cooperative Jahn-Teller distortion of Mn3+ ions and considerable interlayer cation mixing. By continuous disordering and further oxygen loss, it finally transforms into a simple cubic rock salt structure above 1000°C, as shown by thermogravimetry and high-temperature X-ray powder diffraction. X-ray absorption near-edge structure results confirm that oxygen deficiency induces reduction of mainly Mn and to a small extent Ni, commencing with the fully oxidized stoichiometry Li23 [Mn 23 3.5+ Ni 13 3+] O2. This correlates with oxygen contents determined by thermogravimetry and Rietveld refinement of powder X-ray diffraction data, with oxidation states determined by chemical titration and with electrochemical behavior during cycling. The cycling results show that samples with the O2 structure have better performance and capacity than those with O3 and especially O 3′ structures and that the O3, O 3′ capacity decreases with increasing oxygen deficiency δ.

LanguageEnglish
JournalJournal of the Electrochemical Society
Volume154
Issue number8
DOIs
Publication statusPublished - 2007

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Stoichiometry
stoichiometry
halites
hypoxia
Oxygen
thermogravimetry
oxygen
cycles
x rays
X ray powder diffraction
Thermogravimetric analysis
diffraction
titration
Salts
Rocks
interlayers
Jahn-Teller effect
Rietveld refinement
X ray absorption
cations

Cite this

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title = "Oxygen stoichiometry-structure-property correlations in Li2/3 [Mn2/3Ni1/3]O2-δ with O3 structure",
abstract = "The layered rock salt material Li23 [Mn23 Ni13] O2-δ with the O3 structure loses up to 16 2 3 {\%} of its oxygen reversibly at high temperature. It transforms initially to a second layered structure, O 3′, that may be associated with cooperative Jahn-Teller distortion of Mn3+ ions and considerable interlayer cation mixing. By continuous disordering and further oxygen loss, it finally transforms into a simple cubic rock salt structure above 1000°C, as shown by thermogravimetry and high-temperature X-ray powder diffraction. X-ray absorption near-edge structure results confirm that oxygen deficiency induces reduction of mainly Mn and to a small extent Ni, commencing with the fully oxidized stoichiometry Li23 [Mn 23 3.5+ Ni 13 3+] O2. This correlates with oxygen contents determined by thermogravimetry and Rietveld refinement of powder X-ray diffraction data, with oxidation states determined by chemical titration and with electrochemical behavior during cycling. The cycling results show that samples with the O2 structure have better performance and capacity than those with O3 and especially O 3′ structures and that the O3, O 3′ capacity decreases with increasing oxygen deficiency δ.",
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Oxygen stoichiometry-structure-property correlations in Li2/3 [Mn2/3Ni1/3]O2-δ with O3 structure. / Pasero, D.; Reeves, N.; Gillie, L.; Pralong, V.; West, A. R.

In: Journal of the Electrochemical Society, Vol. 154, No. 8, 2007.

Research output: Contribution to journalArticle

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AU - West, A. R.

PY - 2007

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N2 - The layered rock salt material Li23 [Mn23 Ni13] O2-δ with the O3 structure loses up to 16 2 3 % of its oxygen reversibly at high temperature. It transforms initially to a second layered structure, O 3′, that may be associated with cooperative Jahn-Teller distortion of Mn3+ ions and considerable interlayer cation mixing. By continuous disordering and further oxygen loss, it finally transforms into a simple cubic rock salt structure above 1000°C, as shown by thermogravimetry and high-temperature X-ray powder diffraction. X-ray absorption near-edge structure results confirm that oxygen deficiency induces reduction of mainly Mn and to a small extent Ni, commencing with the fully oxidized stoichiometry Li23 [Mn 23 3.5+ Ni 13 3+] O2. This correlates with oxygen contents determined by thermogravimetry and Rietveld refinement of powder X-ray diffraction data, with oxidation states determined by chemical titration and with electrochemical behavior during cycling. The cycling results show that samples with the O2 structure have better performance and capacity than those with O3 and especially O 3′ structures and that the O3, O 3′ capacity decreases with increasing oxygen deficiency δ.

AB - The layered rock salt material Li23 [Mn23 Ni13] O2-δ with the O3 structure loses up to 16 2 3 % of its oxygen reversibly at high temperature. It transforms initially to a second layered structure, O 3′, that may be associated with cooperative Jahn-Teller distortion of Mn3+ ions and considerable interlayer cation mixing. By continuous disordering and further oxygen loss, it finally transforms into a simple cubic rock salt structure above 1000°C, as shown by thermogravimetry and high-temperature X-ray powder diffraction. X-ray absorption near-edge structure results confirm that oxygen deficiency induces reduction of mainly Mn and to a small extent Ni, commencing with the fully oxidized stoichiometry Li23 [Mn 23 3.5+ Ni 13 3+] O2. This correlates with oxygen contents determined by thermogravimetry and Rietveld refinement of powder X-ray diffraction data, with oxidation states determined by chemical titration and with electrochemical behavior during cycling. The cycling results show that samples with the O2 structure have better performance and capacity than those with O3 and especially O 3′ structures and that the O3, O 3′ capacity decreases with increasing oxygen deficiency δ.

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