Byeon, Young-Woon Choi, Yong-Seok Ahn, Jae-Pyoung Lee, Jae-Chul 2024-01-19T21:04:21Z 2024-01-19T21:04:21Z 2021-09-05 2018-12-05 1944-8244 https://pubs.kist.re.kr/handle/201004/120587 High-rate performance and mechanical stability of anode materials are the two important characteristics that are necessary to develop fast-charging batteries with longevity. In the present study, we demonstrate that both high rate performance and mechanical stability of the anode can be achieved with the Na-Sn battery system. Experiments show that the sodiation rate in crystalline Sn (c-Sn) is 2-3 orders of magnitude faster than that reported for the Li Si system. Furthermore, this extraordinary rate is nearly the same regardless of the orientation of c-Sn, which can improve the cycle life by retarding the pulverization of c-Sn. Two main microstructural features responsible for the observed characteristics are identified: (1) a transformation from crystalline to amorphous phase occurring at thin layers of c-Sn near the interfacial front and (2) pipe diffusion of Na through sodiation-induced dislocations. In this study, the observed behaviors are explained by elucidating the diffusion kinetics, whereas the associated mechanistic origins are analyzed by resolving the diffusion process of Na+ near the Na/Sn interface using atomic simulations. English American Chemical Society IN-SITU TEM ELECTROCHEMICAL LITHIATION MOLECULAR-DYNAMICS DIFFUSION DYNAMICS SILICON NANOWIRES AMORPHOUS-CARBON EDGE DISLOCATION ION SODIUM LI Isotropic Sodiation Behaviors of Ultrafast-Chargeable Tin Crystals Article 10.1021/acsami.8b15758 1 ACS Applied Materials & Interfaces, v.10, no.48, pp.41389 - 41397 ACS Applied Materials & Interfaces 10 48 41389 41397 scie scopus 000452694100047 2-s2.0-85057528719 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article IN-SITU TEM ELECTROCHEMICAL LITHIATION MOLECULAR-DYNAMICS DIFFUSION DYNAMICS SILICON NANOWIRES AMORPHOUS-CARBON EDGE DISLOCATION ION SODIUM LI Na-ion batteries isotropic sodiation in situ experiment phase transition ultra-fast charging