Isotropic Sodiation Behaviors of Ultrafast-Chargeable Tin Crystals
- Authors
- Byeon, Young-Woon; Choi, Yong-Seok; Ahn, Jae-Pyoung; Lee, Jae-Chul
- Issue Date
- 5-12월-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Na-ion batteries; isotropic sodiation; in situ experiment; phase transition; ultra-fast charging
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.10, no.48, pp.41389 - 41397
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 10
- Number
- 48
- Start Page
- 41389
- End Page
- 41397
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/71242
- DOI
- 10.1021/acsami.8b15758
- ISSN
- 1944-8244
- Abstract
- 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.
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