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Issue 22, 2012
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In situ investigations of a Li-rich Mn–Ni layered oxide for Li-ion batteries

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Abstract

A Li-rich layered oxide with the formula Li[Li0.2Mn0.61Ni0.18Mg0.01]O2 was successfully synthesised and characterised using several in situ characterisation techniques. The electronic state and structural evolution of the material upon cycling were investigated using in situ XRD, EXAFS and XANES measurements. XANES and SQUID magnetic measurements showed that the initial material contains a certain amount of Mn3+ in a low spin configuration (average Mn oxidation state: +3.75). In situ measurements showed that the first part of the charge (up to 4.4 V vs. Li+/Li) corresponds to oxidation of the Mn3+ fraction, and that the oxidation of nickel occurs only later, on the main charge plateau at 4.5 V. Electrochemical and structural results tend to show that the main first-charge plateau is a two-phase process where a new phase is created. This new phase is structurally very close to the starting one, and could be an oxygen-deficient spinel with a = 8.25 Å. This process is non-reversible, and further cycling occurs in the new phase formed in situ.

Graphical abstract: In situ investigations of a Li-rich Mn–Ni layered oxide for Li-ion batteries

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Publication details

The article was received on 27 Feb 2012, accepted on 31 Mar 2012 and first published on 02 Apr 2012


Article type: Paper
DOI: 10.1039/C2JM31205K
Citation: J. Mater. Chem., 2012,22, 11316-11322
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    In situ investigations of a Li-rich Mn–Ni layered oxide for Li-ion batteries

    L. Simonin, J. Colin, V. Ranieri, E. Canévet, J. Martin, C. Bourbon, C. Baehtz, P. Strobel, L. Daniel and S. Patoux, J. Mater. Chem., 2012, 22, 11316
    DOI: 10.1039/C2JM31205K

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