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.
|Number of pages||10|
|Publication status||Published - 2020 Nov 21|
Bibliographical noteFunding Information:
This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP), the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [Grant No. 20172420108590], and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) [Grant No. 2019R1A2C1088424].
© The Royal Society of Chemistry.
All Science Journal Classification (ASJC) codes
- Materials Science(all)