Solid Solution Domains at Phase Transition Front of Li<inf>x</inf>Ni<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf>

Hideyuki Komatsu, Hajime Arai, Yukinori Koyama, Kenji Sato, Takeharu Kato, Ryuji Yoshida, Haruno Murayama, Ikuma Takahashi, Yuki Orikasa, Katsutoshi Fukuda, Tsukasa Hirayama, Yuichi Ikuhara, Yoshio Ukyo, Yoshiharu Uchimoto, Zempachi Ogumi

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    Nickel-substituted manganese spinel LiNi<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> (LNMO) is a promising 5 V class positive electrode material for lithium-ion batteries. As micron-sized LNMO particles show high rate capability in its two-phase coexistence regions, the phase transition mechanism is of great interest in understanding the electrode behavior at high rates. Here, the phase transition dynamics of Li<inf>x</inf>Ni<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> is elucidated on high rate charging-discharging using operando time-resolved X-ray diffraction (TR-XRD). The TR-XRD results indicate the existence of intermediate states, in addition to the thermodynamically stable phases, and it is shown that the origin of such intermediate states is ascribed to the solid-solution domains at the phase transition front, as supported by the analysis using transmission electron microscopy coupled with electron energy-loss spectroscopy. The phase transition pathways dependent on the reaction rate are shown, together with possible explanation for this unique transition behavior. Here the phase transition dynamics of Li<inf>x</inf>Ni<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> is elucidated on high rate charging-discharging using operando time-resolved X-ray diffraction (TR-XRD). The TR-XRD results indicate the existence of intermediate states ascribed to the solid-solution domains at the phase transition front. The phase transition pathways dependent on the reaction rate are shown, together with possible explanation for this unique transition behavior.

    Original languageEnglish
    JournalAdvanced Energy Materials
    DOIs
    Publication statusAccepted/In press - 2015

    Keywords

    • High rate capability
    • LiNi<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf>
    • Lithium-ion batteries
    • Phase transition
    • Structure-property relationships

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Materials Science(all)

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