Chemically oxidized γ-MnO2 for lithium secondary batteries: structure and intercalation/deintercalation properties

Won Il Jung; Miki Nagao; Cédric Pitteloud; Keiji Itoh; Atsuo Yamada; Ryoji Kanno

doi:10.1039/B812683F

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Chemically oxidized γ-MnO₂ for lithium secondary batteries: structure and intercalation/deintercalation properties†

Won Il Jung,^a Miki Nagao,^a Cédric Pitteloud,^a Keiji Itoh,^b Atsuo Yamada^a and Ryoji Kanno*^a

Author affiliations

* Corresponding authors

^a Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Japan
E-mail: kanno@echem.titech.ac.jp
Fax: +81 45 924 5401
Tel: +81 45 924 5409

^b Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Japan

Abstract

Structural changes of chemically lithiated γ-MnO₂ during chemical oxidation were characterized by X-ray diffraction combined with a stacking fault analysis and neutron total scattering with a local structure analysis. Lithium ions intercalate into the crystallographic sites around “Ruetschi” protons prior to those around “Coleman” protons for the chemically lithiated γ-MnO₂. The “Ruetschi” and “Coleman” protons have O–H bond lengths of 1.2 Å and 1.9 Å, respectively, which decreased after the chemical oxidation. The chemically intercalated lithium ions are placed at the center of oxygen octahedra with an O–Li length of 1.9 Å.

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Supplementary files

Background of the structure for γ-MnO₂, oxidation mechanism, cyclability data for γ-MnO₂, comparison of ex-situ XRD patterns during the first two cycles (sampleRAM), the data file format of DIFFaX simulation for γ-MnO₂ in Backus–Naur form PDF (604K)

Article information

DOI: https://doi.org/10.1039/B812683F
Article type: Paper
Submitted: 24 Jul 2008
Accepted: 25 Sep 2008
First published: 06 Jan 2009

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J. Mater. Chem., 2009,19, 800-806

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Chemically oxidized γ-MnO₂ for lithium secondary batteries: structure and intercalation/deintercalation properties

W. I. Jung, M. Nagao, C. Pitteloud, K. Itoh, A. Yamada and R. Kanno, J. Mater. Chem., 2009, 19, 800 DOI: 10.1039/B812683F

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Journal of Materials Chemistry