Intermolecular interaction engineering to enhance Lithium-Ion storage in Two-Dimensional oxidized silicon nanosheet anodes

Se In Kim, Woong Ju Kim, Jin Gu Kang, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Unlike conventional Si anodes for use in Li-ion batteries, 2D oxidized Si nanosheets, i.e., siloxene, undergo negligible volume expansion during cycling owing to their unique geometries and chemical structures. Nevertheless, siloxene receives less attention than other Si-based nanostructures, partly because the interactions of siloxene with conventional binders and their effects on charge storage are largely unexplored. Herein, the intermolecular interactions of siloxene with four typical binders (alginate, carboxymethyl cellulose, polyacrylic acid, and α-polyvinylidene fluoride) are investigated to enhance the electrochemical performance using a simple method. The binders are selected using two criteria, i.e., polarity and functional groups, and they exhibit different intermolecular interactions with siloxene. Particularly, alginate forms the strongest intermolecular bonds, which are attributed to dipole–dipole attractions between the H atoms in siloxene and the OH groups in alginate. The trend of the intermolecular binding strengths of the binders is consistent with those of the cycling stabilities and rate performances. The alginate-based siloxene electrode displays an excellent charge capacity retention of 66 % after 500 cycles at 200 mA g−1, which is unprecedented for pristine siloxene anodes. This study provides useful guidelines for designing binders for use in electrode materials with chemical structures similar to that of siloxene.

Original languageEnglish
Article number143364
JournalChemical Engineering Journal
Volume467
DOIs
Publication statusPublished - 2023 Jul 1

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • 2D nanosheets
  • Binders
  • Intermolecular interactions
  • Lithium-ion batteries
  • Siloxene anodes

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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