Variable oxygen stoichiometry in layered rock salt cathodes, Lix(Mn,Ni)O2, depending on synthesis conditions

Denis Pasero, Nik Reeves, Lisa J. Gillie, Anthony R. West

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The oxygen content in a selection of layered rock salt phases in the system Li-Mn-Ni-O has been investigated by thermogravimetry. Phases that are oxygen-stoichiometric, such as Li2MnO3 and LiMn0.5Ni0.5O2, may lose up to 1% of their oxygen reversibly, on heating to ∼1000 °C. Cation-deficient phases, such as Li2/3(Mn2/3Ni1/3)O2, however, are capable of much greater reversible oxygen loss, leading eventually to an oxygen-stoichiometric cubic rock salt phase with a cation-disordered structure. The oxygen contents of such layered rock salt phases are determined directly by their synthesis conditions and have a direct effect on the charge/discharge capacity during lithium deintercalation.

Original languageEnglish
Pages (from-to)1078-1081
Number of pages4
JournalJournal of Power Sources
Volume174
Issue number2
DOIs
Publication statusPublished - 6 Dec 2007

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halites
Stoichiometry
stoichiometry
Cathodes
Salts
cathodes
Rocks
Oxygen
oxygen
synthesis
Cations
Positive ions
cations
thermogravimetry
Lithium
Thermogravimetric analysis
lithium
Heating
heating

Cite this

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title = "Variable oxygen stoichiometry in layered rock salt cathodes, Lix(Mn,Ni)O2, depending on synthesis conditions",
abstract = "The oxygen content in a selection of layered rock salt phases in the system Li-Mn-Ni-O has been investigated by thermogravimetry. Phases that are oxygen-stoichiometric, such as Li2MnO3 and LiMn0.5Ni0.5O2, may lose up to 1{\%} of their oxygen reversibly, on heating to ∼1000 °C. Cation-deficient phases, such as Li2/3(Mn2/3Ni1/3)O2, however, are capable of much greater reversible oxygen loss, leading eventually to an oxygen-stoichiometric cubic rock salt phase with a cation-disordered structure. The oxygen contents of such layered rock salt phases are determined directly by their synthesis conditions and have a direct effect on the charge/discharge capacity during lithium deintercalation.",
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Variable oxygen stoichiometry in layered rock salt cathodes, Lix(Mn,Ni)O2, depending on synthesis conditions. / Pasero, Denis; Reeves, Nik; Gillie, Lisa J.; West, Anthony R.

In: Journal of Power Sources, Vol. 174, No. 2, 06.12.2007, p. 1078-1081.

Research output: Contribution to journalArticle

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T1 - Variable oxygen stoichiometry in layered rock salt cathodes, Lix(Mn,Ni)O2, depending on synthesis conditions

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AU - Reeves, Nik

AU - Gillie, Lisa J.

AU - West, Anthony R.

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