Triethoxysilane-derived SiO: X-assisted structural reinforcement of Si/carbon nanotube composite for lithium-ion battery

Byung Hoon Park, Geon Woo Lee, Soo Bean Choi, Young Hwan Kim, Kwang Bum Kim

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Herein, triethoxysilane-derived SiOx is used as a robust adhesive anchor to bind Si nanoparticles (NPs) and carbon nanotubes (CNTs) to prepare a structurally reinforced Si/CNT microsphere composite. The chemical reaction between the silanol groups of triethoxysilane with the hydroxyl groups on the Si surface and acid-treated CNTs induce strong chemical bonds between the Si NPs and CNTs and among neighboring CNTs, facilitating electron-conduction pathways and structural integrity of the composite, even under severe stress/strain. Thus, the structurally reinforced Si/CNT/SiOx microsphere composite exhibits superior cyclability: ∼88% of its initial capacity of 1112 mA h g-1 is retained after 100 cycles at 0.5 A g-1. Moreover, the Si/CNT/SiOx composite exhibits a negligible change in electrode thickness after 100 cycles. The stable electrochemical behavior and negligible change in the electrode thickness are attributed to the maintenance of the electron-conduction pathways and structural integrity of the Si/CNT/SiOx composite, enabled by the binding of neighboring CNTs with the SiOx anchor.

Original languageEnglish
Pages (from-to)22140-22149
Number of pages10
JournalNanoscale
Volume12
Issue number43
DOIs
Publication statusPublished - 2020 Nov 21

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • General Materials Science

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