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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Revisiting on the effect and role of TiO2 layer thickness on SnO2 for enhanced electrochemical performance for lithium-ion batteries

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Title
Revisiting on the effect and role of TiO2 layer thickness on SnO2 for enhanced electrochemical performance for lithium-ion batteries
Author(s)
Jun Young Cheong; Joon Ha Chang; Chanhoon Kim; Frank Jaksoni Mweta; Ji-Won Jung; Jeong Yong Lee; Il-Doo Kim
Publication Date
2017-12
Journal
ELECTROCHIMICA ACTA, v.258, no., pp.1140 - 1148
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
Careful modulation of surficial and interfacial properties of electrode materials is a critical factor for determining overall electrochemical characteristics. Recent studies have indicated that metal oxide nanocoating layer (such as titanium (IV) oxide (TiO2)) on metal oxide anodes (such as tin (IV) oxide (SnO2)) exhibited superior electrochemical properties, but fundamental research on the effect and role of TiO2 layer thickness has been limited. Here we have successfully conducted in-depth study on how the thickness of TiO2 overlayer on SnO2 can have significant influence in the overall parameters of electro-chemistry. It is revealed that TiO2 overlayer with 12 nm shows good cycle retention (75.8%) even after 80 cycles and retains capacity of 438.3 mAh g(-1) even at high current density (5000 mA g(-1)). Surprisingly, it was further discovered that TiO2 layer not only alleviates the volume expansion but also helps to facilitate Li ion transport compared with SnO2. The improvements in both ionic and electrical conductivity of TiO2 layer are main factors in better cycle retention and rate capabilities. Finally, in situ transmission electron microscopy analysis was adopted to observe the growth dynamics of solid electrolyte interphase layer on TiO2@SnO2, which demonstrates that TiO2 overlayer results in homogeneous and thinner interphase layer compared with SnO2 NTs. (c) 2017 Elsevier Ltd. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/4758
ISSN
0013-4686
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
Electrochimica Acta 258 (2017) 1140e1148.pdfDownload

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