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Research Article

Free-standing hybrid films comprising of ultra-dispersed titania nanocrystals and hierarchical conductive network for excellent high rate performance of lithium storage

Kunlei Zhu1,2( ), Chenyu Li2, Yushuang Jiao1, Jiawen Zhu1, Hongtao Ren3, Yufeng Luo4, Shoushan Fan4, Kai Liu2( )
College of Chemistry and Chemical Engineering, Qufu Normal University, Jingxuan West Road NO.57, Qufu 273165, China
State Key Laboratory of New Ceramics and Fine Processing, and Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
School of Materials Science and Engineering, Liaocheng University, Hunan Road No. 1, Liaocheng 252000, China
Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China
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Graphical Abstract

Abstract

The construction of advanced electrode materials is key to the field of energy storage. Herein, a free-standing anatase titania (TiO2) nanocrystal/carbon nanotube (CNT) film is reported using a simple and scalable sol-gel method, followed by calcination. This unique free-standing film comprises ultra-small TiO2 nanocrystals (~ 5.9 nm) and super-aligned CNTs, with ultra-dispersed TiO2 nanocrystals on the surfaces of the CNTs. On the one hand, these TiO2 nanocrystals can significantly decrease the diffusion distance of the charges and on the other hand, the cross-linked CNTs can act as a three-dimensional (3D) conductive network, allowing the fast transport of electrons. In addition, the film is free-standing, without requiring electrode fabrication and additional conductive agents and binders. Owing to these above synergistic effects, the film is directly used as an anode in Li-ion batteries, and delivers a high discharge capacity of ~ 105 mAh·g-1 at high rate of 60 C (1 C = 170 mA·g-1) and excellent cycling performance over 2,500 cycles at 30 C. These results indicate that the free-standing anatase TiO2 nanocrystal/CNT film affords a superior performance among the various TiO2 materials and can be a promising anode material for fast-charging Li-ion batteries. Moreover, the TiO2/CNT film exhibits an areal capacity of up to 2.4 mAh·cm-2, confirming the possibility of its practical use.

Keywords

carbon nanotubesfree-standinghigh rateLi-ion batteriesTiO2ultra-small

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Nano Research
Volume 14 Issue 7,
July 2021
Pages 2301-2308
DOI: 10.1007/s12274-020-3225-7
Cite this article:
Zhu K, Li C, Jiao Y, et al. Free-standing hybrid films comprising of ultra-dispersed titania nanocrystals and hierarchical conductive network for excellent high rate performance of lithium storage. Nano Research, 2021, 14(7): 2301-2308. https://doi.org/10.1007/s12274-020-3225-7
Topics:
AnodesCarbon nanotubesEnergy storageGel process GelsIon batteriesLithiumNanocrystalsOxide mineralsSols

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Received: 17 September 2020
Revised: 28 October 2020
Accepted: 05 November 2020
Published: 05 July 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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