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

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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
Issue number2
Publication statusPublished - 6 Dec 2007


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