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

doi:10.1016/j.jpowsour.2007.06.037

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 journal › Article › peer-review

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 LiMn_0.5Ni_0.5O₂, may lose up to 1% of their oxygen reversibly, on heating to ∼1000 °C. Cation-deficient phases, such as Li_2/3(Mn_2/3Ni_1/3)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 language	English
Pages (from-to)	1078-1081
Number of pages	4
Journal	Journal of Power Sources
Volume	174
Issue number	2
DOIs	https://doi.org/10.1016/j.jpowsour.2007.06.037
Publication status	Published - 6 Dec 2007

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10.1016/j.jpowsour.2007.06.037

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

AU - Pasero, Denis

AU - Reeves, Nik

AU - Gillie, Lisa J.

AU - West, Anthony R.

PY - 2007/12/6

Y1 - 2007/12/6

N2 - 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.

AB - 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.

KW - Batteries

KW - Deficiency

KW - Lithium

KW - Oxygen

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DO - 10.1016/j.jpowsour.2007.06.037

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JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

IS - 2

ER -

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

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