Solid Solution Domains at Phase Transition Front of LixNi0.5Mn1.5O4

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

研究成果: ジャーナルへの寄稿学術誌査読

27 被引用数 (Scopus)


Nickel-substituted manganese spinel LiNi0.5Mn1.5O4 (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 LixNi0.5Mn1.5O4 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.

ジャーナルAdvanced Energy Materials
出版ステータス出版済み - 9月 1 2015

!!!All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 材料科学(全般)


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