Journal
NANOSCALE
Volume 12, Issue 43, Pages 22140-22149Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr05178k
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Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20172420108590]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A2C1088424]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20172420108590] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019R1A2C1088424] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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: similar to 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.
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