Characterization of Nano-Sized Epitaxial Li₄Ti₅O₁₂(110) Film Electrode for Lithium Batteries (Increasing Demands for Next Generation New Rechargeable Batteries) Characterization of Nano-Sized Epitaxial Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>(110) Film Electrode for Lithium Batteries

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Author(s)

    • KIM Kyungsu KIM Kyungsu
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • SUZUKI Kota [他] SUZUKI Kota
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • TAMINATO Sou
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • TAMURA Kazuhisa
    • Japan Atomic Energy Agency, Synchrotron Radiation Research Center, Kansai Research Establishment
    • MIZUKI Jun’ichiro
    • Japan Atomic Energy Agency, Synchrotron Radiation Research Center, Kansai Research Establishment
    • HIRAYAMA Masaaki
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • KANNO Ryoji
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

Abstract

Electrochemical properties and structure changes of nano-sized Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> during lithium (de)intercalation were investigated using a two-dimensional thin film electrode. Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> thin films were deposited on a Nb:SrTiO<sub>3</sub>(110) substrate by a pulsed laser deposition technique. X-ray diffraction and reflectometry measurements confirmed the epitaxial growth of 27.6-nm-thick Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>(110) films. Galvanostatic charge-discharge curves showed a large discharge capacity of 217 mAh g<sup>−1</sup> at the initial discharge cycle, although the reversible capacity decreased in subsequent cycles. In situ X-ray diffraction measurements clarified the drastic structural changes of the Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> film upon soaking in the electrolyte and during the first intercalation and deintercalation processes. The surface region of Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> had a different structure from the bulk during electrochemical cycling and could cause the nano-sized Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> electrodes to have high capacities and poor stabilities.

Journal

  • Electrochemistry

    Electrochemistry 80(10), 800-803, 2012

    The Electrochemical Society of Japan

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