In situ and operando investigation of the dynamic morphological and phase changes of a selenium-doped germanium electrode during (de)lithiation processes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Tianyi Li
  • Cheolwoong Lim
  • Yi Cui
  • Xinwei Zhou
  • Huixiao Kang
  • Bo Yan
  • Melissa L. Meyerson
  • Jason A. Weeks
  • Fangmin Guo
  • Ronghui Kou
  • Yuzi Liu
  • Vincent De Andrade
  • Francesco De Carlo
  • Yang Ren
  • Cheng-Jun Sun
  • C. Buddie Mullins
  • Lei Chen
  • Yongzhu Fu
  • Likun Zhu

Detail(s)

Original languageEnglish
Pages (from-to)750-759
Journal / PublicationJournal of Materials Chemistry A
Volume8
Issue number2
Online published5 Dec 2019
Publication statusPublished - 14 Jan 2020
Externally publishedYes

Abstract

To understand the effect of selenium doping on the good cycling performance and rate capability of a Ge0.9Se0.1 electrode, the dynamic morphological and phase changes of the Ge0.9Se0.1 electrode were investigated by synchrotron-based operando transmission X-ray microscopy (TXM) imaging, X-ray diffraction (XRD), and X-ray absorption spectroscopy (XAS). The TXM results show that the Ge0.9Se0.1 particle retains its original shape after a large volume change induced by (de)lithiation and undergoes a more sudden morphological and optical density change than pure Ge. The difference between Ge0.9Se0.1 and Ge is attributed to a super-ionically conductive Li-Se-Ge network formed inside Ge0.9Se0.1 particles, which contributes to fast Li-ion pathways into the particle and nano-structuring of Ge as well as buffering the volume change of Ge. The XRD and XAS results confirm the formation of a Li-Se-Ge network and reveal that the Li-Se-Ge phase forms during the early stages of lithiation and is an inactive phase. The Li-Se-Ge network also can suppress the formation of the crystalline Li15Ge4 phase. These in situ and operando results reveal the effect of the in situ formed, super-ionically conductive, and inactive network on the cycling performance of Li-ion batteries and shed light on the design of high capacity electrode materials.  © 2019 The Royal Society of Chemistry.

Citation Format(s)

In situ and operando investigation of the dynamic morphological and phase changes of a selenium-doped germanium electrode during (de)lithiation processes. / Li, Tianyi; Lim, Cheolwoong; Cui, Yi; Zhou, Xinwei; Kang, Huixiao; Yan, Bo; Meyerson, Melissa L.; Weeks, Jason A.; Liu, Qi; Guo, Fangmin; Kou, Ronghui; Liu, Yuzi; De Andrade, Vincent; De Carlo, Francesco; Ren, Yang; Sun, Cheng-Jun; Mullins, C. Buddie; Chen, Lei; Fu, Yongzhu; Zhu, Likun.

In: Journal of Materials Chemistry A, Vol. 8, No. 2, 14.01.2020, p. 750-759.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal