Anisotropic lithium-ion migration and electro-chemo-mechanical coupling in Sb2Se3 single crystals

Chunhao Sun, Weikang Dong, Le Yang, Xintao Zuo, Lixia Bao, Ze Hua, Xiaoxue Chang, Ran Cai, Haosen Chen, Xiaodong Han, Yang He*, Tiansheng Liu*, Ruiwen Shao*, Lixin Dong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Harvesting the promising high energy density of advanced electrode materials in lithium-ion batteries is critically dependent on a mechanistic understanding on how the materials function and degrade along with the battery cycling. Here, we tracked phase transformations during (de)lithiation of Sb2Se3 single crystals using in situ high-resolution transmission electron microscopy (HRTEM) technique, and revealed electro-chemo-mechanical evolution at the reaction interface. The effect of this electro-chemo-mechanical coupling has a complicated interplay on the lithiation kinetics and causes various types of defects at the reaction front, including dislocation dipoles, antiphase boundaries, and cracks. In return, the formed cracks and related defects build a path for fast diffusion of lithium ions and trigger a highly anisotropic lithiation at the twisted reaction front, giving rise to the formation of presumably “dead” Sb2Se3 nanodomains in amorphous LixSb2Se3. The detailed mechanistic understanding may facilitate the rational design of high-capacity electrode materials for battery applications.

Translated title of the contributionSb2Se3单晶中的各向异性锂离子迁移和电化学-力学 耦合
Original languageEnglish
Pages (from-to)2657-2664
Number of pages8
JournalScience China Materials
Volume65
Issue number10
DOIs
Publication statusPublished - Oct 2022

Keywords

  • cracks
  • dislocation dipole
  • electro-chemo-mechanical coupling
  • in situ TEM
  • interface

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