Isotropic Sodiation Behaviors of Ultrafast-Chargeable Tin Crystals

Young Woon Byeon, Yong Seok Choi, Jae Pyoung Ahn, Jae Chul Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)41389-41397
Number of pages9
JournalACS Applied Materials and Interfaces
Volume10
Issue number48
DOIs
Publication statusPublished - 2018 Dec 5

Bibliographical note

Funding Information:
We appreciate to Cheol-Hwee Shim and Yanghee Kim from Advanced Analysis Center, Korea Institute of Science and Technology, for their technical assistance. This work was supported by the Samsung Research Funding Center of Samsung Electronics under project no. SRFC-MA1602-04.

Publisher Copyright:
© 2018 American Chemical Society.

Keywords

  • Na-ion batteries
  • in situ experiment
  • isotropic sodiation
  • phase transition
  • ultra-fast charging

ASJC Scopus subject areas

  • General Materials Science

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