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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. and West, Anthony R. (2007) Variable oxygen stoichiometry in layered rock salt cathodes, Lix(Mn,Ni)O2, depending on synthesis conditions. Journal of Power Sources, 174 (2). pp. 1078-1081. ISSN 03787753

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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.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Schools: School of Applied Sciences
School of Applied Sciences > Materials and Catalysis Research Centre
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Depositing User: Sara Taylor
Date Deposited: 20 Feb 2009 14:34
Last Modified: 02 Jun 2009 13:30
URI: http://eprints.hud.ac.uk/id/eprint/3458

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