Atomic-layer-deposited TiO2-SnZnO/carbon nanofiber composite as a highly stable, flexible and freestanding anode material for lithium-ion batteries
- Authors
- Joshi, Bhavana; Samuel, Edmund; Kim, Min-Woo; Park, Sera; Swihart, Mark T.; Yoon, Woo Young; Yoon, Sam S.
- Issue Date
- 15-4월-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Electrospinning; SnZnO; Carbon nanofiber; Atomic layer deposition; Lithium-ion battery; Anode
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.338, pp.72 - 81
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 338
- Start Page
- 72
- End Page
- 81
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/76138
- DOI
- 10.1016/j.cej.2018.01.004
- ISSN
- 1385-8947
- Abstract
- We demonstrate the synthesis of a highly stable, freestanding and flexible anode material for lithium-ion batteries created by depositing a conformal coating of TiO2 on a SnZnO/carbon nanofiber (CNF) composite using atomic layer deposition. The term SnZnO is used here because metallic Sn is observed in the SnZnO/CNF composites after annealing under argon gas. The elemental composition of the material was confirmed by energy-dispersive X-ray spectroscopy, while the oxidation states of the elements were determined by X-ray photoelectron spectroscopy. Cross-sectional transmission electron microscopy showed that the core regions of the composite nanofibers were almost uniformly covered by a TiO2 shell. The specific capacities of the TiO2-coated and uncoated samples at a high current density (5C) were 413 and 159 mAh.g(-1), respectively. An analysis of the surface morphology after cycling indicated that the stability of the solid electrolyte interface layer increased after the formation of the protective conformal TiO2 layer. As a result, no signs of anode degradation were observed even after 700 cycles at a current density of 5C. We attribute this exceptional stability to the buffering of the anode material by the protective coating during volumetric expansion.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
- College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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