Isotropic Sodiation Behaviors of Ultrafast-Chargeable Tin Crystals

Young Woon Byeon, Yong Seok Choi, Jae Pyoung Ahn, Jae-chul Lee

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3 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

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Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)

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