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Influence of Ti4+ on the Electrochemical Performance of Li-Rich Layered Oxides - High Power and Long Cycle Life of Li2Ru1–xTixO3 Cathodes

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    Research Article

    Influence of Ti4+ on the Electrochemical Performance of Li-Rich Layered Oxides - High Power and Long Cycle Life of Li2Ru1–xTixO3 Cathodes
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    † School of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju, 500-757, Republic of Korea
    ‡ Ultimate Manufacturing Technology R&BD Group, KITECH, Cheonan, 331-822, Republic of Korea
    § New and Renewable Energy Research Division, Korea Institute of Energy Research, Daejeon, 305-343, Republic of Korea
    *Tel: +82-62-530-1715. Fax: +82-62-530-1699. E-mail: [email protected] (W.B.I.).
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2015, 7, 13, 7118–7128
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    https://doi.org/10.1021/am507951x
    Published March 11, 2015
    Copyright © 2015 American Chemical Society
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    Abstract

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    Li-rich layered oxides are the most attractive cathodes for lithium-ion batteries due to their high capacity (>250 mAh g–1). However, their application in electric vehicles is hampered by low power density and poor cycle life. To address these, layered Li2Ru0.75Ti0.25O3 (LRTO) was synthesized and the influence of electroinactive Ti4+ on the electrochemical performance of Li2RuO3 was investigated. LRTO exhibited a reversible capacity of 240 mAh g–1 under 14.3 mA g–1 with 0.11 mol of Li loss after 100 cycles compared to 0.22 mol of Li for Li2Ru0.75Sn0.25O3. More Li+ can be extracted from LRTO (0.96 mol of Li) even after 250 cycles at 143 mA g–1 than Li2RuO3 (0.79 mol of Li). High reversible Li extraction and long cycle life were attributed to structural stability of the LiM2 layer in the presence of Ti4+, facilitating the lithium diffusion kinetics. The versatility of the Li2MO3 structure may initiate exploration of Ti-based Li-rich layered oxides for vehicular applications.

    Copyright © 2015 American Chemical Society

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    X-ray diffraction and electrochemical cycling of Li2Ru1–xTixO3 cathodes with x = 0, 0.1, 0.25, 0.4, 0.6, 0.8, and 1.0 at 143 mA g–1; voltage profile of Li2Ru0.75M0.25O3 (M = Sn and Ti) cathodes at different current densities; and electrochemical impedance spectra of Li2RuO3 and Li2Ru0.75M0.25O3 (M = Sn and Ti) cathodes at different state of charge. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Cite this: ACS Appl. Mater. Interfaces 2015, 7, 13, 7118–7128
    Click to copy citationCitation copied!
    https://doi.org/10.1021/am507951x
    Published March 11, 2015
    Copyright © 2015 American Chemical Society
    Request reuse permissions

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