Investigation of the chemical stability of Li sub(7)MnN sub(4) in air

The chemical reactivity in air of the promising metallic nitride Li sub(7)MnN sub(4) as negative electrode for Li-ion batteries has been studied. The evolution of the ageing process with exposure time has been examined by XRD and the degradation kinetics has been determined. This cubic metallic nitr...

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Bibliographic Details
Published in:Corrosion science 2013-12, Vol.77
Main Authors: Panabiere, E, Emery, N, Bach, S, Pereira-Ramos, J-P, Willmann, P
Format: Article
Language:English
Subjects:
Drying
Electrodes
Evolution
Integrity
Lattices
Lithium batteries
Nitrides
Preserves
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Summary:The chemical reactivity in air of the promising metallic nitride Li sub(7)MnN sub(4) as negative electrode for Li-ion batteries has been studied. The evolution of the ageing process with exposure time has been examined by XRD and the degradation kinetics has been determined. This cubic metallic nitride is found to be much less sensitive to the air atmosphere than that exhibited by the lamellar nitridocobaltates Li sub(3-2x)Co sub(x)N (0.1 less than or equal to x less than or equal to 0.44). A fast oxidation step in air leads to the delithiated Li sub(6.2)MnN sub(4) phase after a few hours and is thereafter progressively destroyed by reaction with moisture leading to the formation of LiOH times H sub(2)O and Li sub(2)CO sub(3). Electrochemical experiments on various aged samples support these results. The demonstration of Li sub(7)MnN sub(4) storage in dry air is showed to constitute a relevant solution to preserve the integrity of the nitride host lattice and then its excellent electrochemical properties.
ISSN:0010-938X