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- W3136990887 abstract "Complex hydrides are potential candidates for the solid electrolyte of all-solid-state batteries owing to their high ionic conductivities in which icosahedral anion reorientational motion plays an essential role in high cation diffusion. Herein, we report molecular dynamics (MD) simulations based on a refined force field and first-principles calculations of the two complex hydride systems Li2B12H12 and LiCB11H12 to investigate their structures, order–disorder phase-transition behavior, anion reorientational motion, and cation conductivities. For both systems, force-field-based MD successfully reproduced the structural and dynamical behavior reported in experiments. Remarkably, it showed an entropy-driven order–disorder phase transition associated with high anion reorientational motion. Furthermore, we obtained comparative insights into the cation around the anion, cation site occupancy in the interstitial space provided by anions, cation diffusion route, role of cation vacancies, anion reorientation, and effect of cation–cation correlation on cation diffusion. We also determined the factors responsible for lowering phase transition temperature. These findings are of fundamental importance in fast ion-conducting solids to diminish the transition temperature for practical applications." @default.
- W3136990887 created "2021-03-29" @default.
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- W3136990887 date "2021-03-19" @default.
- W3136990887 modified "2023-10-01" @default.
- W3136990887 title "Comparative Molecular Dynamics Study of the Roles of Anion–Cation and Cation–Cation Correlation in Cation Diffusion in Li<sub>2</sub>B<sub>12</sub>H<sub>12</sub> and LiCB<sub>11</sub>H<sub>12</sub>" @default.
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- W3136990887 doi "https://doi.org/10.1021/acs.chemmater.0c04473" @default.
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