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- Title
Solid Solution Domains at Phase Transition Front of Li <sub>x</sub>Ni<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub>.
- Authors
Komatsu, Hideyuki; Arai, Hajime; Koyama, Yukinori; Sato, Kenji; Kato, Takeharu; Yoshida, Ryuji; Murayama, Haruno; Takahashi, Ikuma; Orikasa, Yuki; Fukuda, Katsutoshi; Hirayama, Tsukasa; Ikuhara, Yuichi; Ukyo, Yoshio; Uchimoto, Yoshiharu; Ogumi, Zempachi
- Abstract
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 Li xNi0.5Mn1.5O4 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.
- Subjects
SOLID solutions; ELECTRODES; MATHEMATICAL models; PHASE transitions; X-ray diffraction measurement; CRYSTALLIZATION
- Publication
Advanced Energy Materials, 2015, Vol 5, Issue 17, pn/a
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201500638