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Development of an efficient CVD technique to prepare TiO2/porous-carbon nanocomposites for high rate lithium-ion capacitors

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Title: Development of an efficient CVD technique to prepare TiO2/porous-carbon nanocomposites for high rate lithium-ion capacitors
Authors: Iwamura, Shinichiroh Browse this author →KAKEN DB
Motohashi, Shota Browse this author
Mukai, Shin R. Browse this author →KAKEN DB
Issue Date: 21-Oct-2020
Publisher: Royal Society of Chemistry
Journal Title: RSC advances
Volume: 10
Issue: 63
Start Page: 38196
End Page: 38204
Publisher DOI: 10.1039/d0ra07590f
Abstract: Titanium dioxide is a promising electrode material for lithium-ion capacitors. When using TiO2 as an electrode material, it is necessary to combine it with carbon at the nanometer level to improve its low electrical conductivity and low reactivity with Li+. However, preparation methods of reported TiO2/porous-carbon nanocomposites are generally not cost-effective, and their productivities are low. In this study, the vacuum liquid-pulse chemical vapor deposition (VLP-CVD) technique was developed to easily prepare TiO2/porous-carbon nanocomposites, where TiO2 nanoparticles with a diameter of similar to 4 nm could be homogeneously deposited inside the pores of meso- or macroporous carbons. Because the deposited TiO2 nanoparticles had access to effective electrically conductive paths formed by the porous-carbon substrate, they showed a high discharge capacity of similar to 200 mA h g(-1)-TiO2 (based on TiO2 weight). In particular, the composite prepared from macroporous carbon showed an extremely high rate performance, where 50% of the discharge capacity was retained at a current density of 15 000 mA g(-1) when compared to that measured at 50 mA g(-1). In addition, the composite also showed very high cyclability, where 80% of the discharge capacity was retained at the 10 000(th) cycle. Because the VLP-CVD technique can be performed using simple apparatus and commercially available starting materials, it can be expected to boost industrial production of TiO2/porous-carbon for lithium-ion capacitors.
Rights: https://creativecommons.org/licenses/by-nc/3.0/
Type: article
URI: http://hdl.handle.net/2115/80259
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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