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

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, enabling 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 mAh gāˆ’1 is retained after 100 cycles at 0.5 A gāˆ’1. Moreover, the Si/CNT/SiOx composite exhibits negligible change in electrode thickness after 100 cycles. The stable electrochemical behavior and negligible change in the electrode thickness are attributable to the maintenance of the electron-conduction pathways and structural integrity of the Si/CNT/SiOx composite, enabled by the binding of neighboring CNTs by the SiOx anchor.

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Supplementary files

Article information


Submitted
11 Jul 2020
Accepted
03 Oct 2020
First published
05 Oct 2020

Nanoscale, 2020, Accepted Manuscript
Article type
Paper

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

B. H. Park, G. Lee, S. B. Choi, Y. H. Kim and K. B. Kim, Nanoscale, 2020, Accepted Manuscript , DOI: 10.1039/D0NR05178K

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