Revealing the effects of electrode crystallographic orientation on battery electrochemistry via the anisotropic lithiation and sodiation of ReS2

Qianqian Li, Yaobin Xu, Zhenpeng Yao, Joohoon Kang, Xiaolong Liu, Chris Wolverton, Mark C. Hersam, Jinsong Wu, Vinayak P. Dravid

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The crystallographic orientation of battery electrode materials can significantly impact electrochemical performance, such as rate capability and cycling stability. Among the layered transition metal dichalcogenides, rhenium disulfide (ReS2) has the largest anisotropic ratio between the two main axes in addition to exceptionally weak interlayer coupling, which serves as an ideal system to observe and analyze anisotropy of electrochemical phenomena. Here, we report anisotropic lithiation and sodiation of exfoliated ReS2 at atomic resolution using in situ transmission electron microscopy. These results reveal the role of crystallographic orientation and anisotropy on battery electrode electrochemistry. Complemented with density functional theory calculations, the lithiation of ReS2 is found to begin with intercalation of Li-ions, followed by a conversion reaction that results in Re nanoparticles and Li2S nanocrystals. The reaction speed is highly anisotropic, occurring faster along the in-plane ReS2 layer than along the out-of-plane direction. Sodiation of ReS2 is found to proceed similarly to lithiation, although the intercalation step is relatively quicker. Furthermore, the microstructure and morphology of the reaction products after lithiation/sodiation show clear anisotropy along the in-plane and out-of-plane directions. These results suggest that crystallographic orientation in highly anisotropic electrode materials can be exploited as a design parameter to improve battery electrochemical performance.

Original languageEnglish
Pages (from-to)7875-7882
Number of pages8
JournalACS nano
Volume12
Issue number8
DOIs
Publication statusPublished - Aug 28 2018

Keywords

  • 2D transition metal dichalcogenides
  • ReS
  • anisotropic lithiation and sodiation
  • in situ transmission electron microscopy
  • reaction mechanism of lithium/sodium-ion battery

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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