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Delicate Structural Control of Si-SiOx-C Composite via High-Speed Spray Pyrolysis for Li-Ion Battery Anodes

Cited 141 time in Web of Science Cited 148 time in Scopus
Authors

Lee, Seung Jong; Kim, Hye Jin; Hwang, Tae Hoon; Choi, Sunghun; Park, Sung Hyeon; Deniz, Erhan; Jung, Dae Soo; Choi, Jang Wook

Issue Date
2017-03
Publisher
American Chemical Society
Citation
Nano Letters, Vol.17 No.3, pp.1870-1876
Abstract
Despite the high theoretical capacity, silicon (Si) anodes in lithium-ion batteries have difficulty in meeting the commercial standards in various aspects. In particular, the huge volume change of Si makes it very challenging to simultaneously achieve high initial Coulombic efficiency (ICE) and long-term cycle life. Herein, we report spray pyrolysis to prepare Si-SiOx composite using an aqueous precursor solution containing Si nanoparticles, citric acid, and sodium hydroxide (NaOH). In the precursor solution, Si nanoparticles are etched by NaOH with the production of [SiO4](4-). During the dynamic course of spray pyrolysis, [SiO4](4-) transforms to SiOx matrix and citric acid decomposes to carbon surface layer with the assistance of NaOH that serves as a decomposition catalyst. As a result, a Si-SiOx composite, in which Si nanodomains are homogeneously embedded in the SiOx matrix with carbon surface layer, is generated by a one-pot process with a residence time of only 3.5 s in a flow reactor. The optimal composite structure in terms of Si domain size and Si-to-O ratio exhibited excellent electrochemical performance, such as reversible capacity of 1561.9 mAh g(-1) at 0.06C rate and ICE of 80.2% and 87.9% capacity retention after 100 cycles at 1C rate.
ISSN
1530-6984
URI
https://hdl.handle.net/10371/164716
DOI
https://doi.org/10.1021/acs.nanolett.6b05191
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  • College of Engineering
  • School of Chemical and Biological Engineering
Research Area Carbon nanotube, Graphene, Lithium-ion battery, Lithium-sulfur battery, Silicon anode

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