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Unprecedented and highly stable lithium storage capacity of (001) faceted nanosheet-constructed hierarchically porous TiO<inf>2</inf>/rGO hybrid architecture for high-performance Li-ion batteries

Yu, WB and Hu, ZY and Jin, J and Yi, M and Yan, M and Li, Y and Wang, HE and Gao, HX and Mai, LQ and Hasan, T and Xu, BX and Peng, DL and Van Tendeloo, G and Su, BL (2020) Unprecedented and highly stable lithium storage capacity of (001) faceted nanosheet-constructed hierarchically porous TiO<inf>2</inf>/rGO hybrid architecture for high-performance Li-ion batteries. National Science Review, 7. pp. 1046-1058. ISSN 2095-5138

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Abstract

© 2020 The Author(s) 2020. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd. Active crystal facets can generate special properties for various applications. Herein, we report a (001) faceted nanosheet-constructed hierarchically porous TiO2/rGO hybrid architecture with unprecedented and highly stable lithium storage performance. Density functional theory calculations show that the (001) faceted TiO2 nanosheets enable enhanced reaction kinetics by reinforcing their contact with the electrolyte and shortening the path length of Li+ diffusion and insertion-extraction. The reduced graphene oxide (rGO) nanosheets in this TiO2/rGO hybrid largely improve charge transport, while the porous hierarchy at different length scales favors continuous electrolyte permeation and accommodates volume change. This hierarchically porous TiO2/rGO hybrid anode material demonstrates an excellent reversible capacity of 250 mAh g-1 at 1 C (1 C = 335 mA g-1) at a voltage window of 1.0-3.0 V. Even after 1000 cycles at 5 C and 500 cycles at 10 C, the anode retains exceptional and stable capacities of 176 and 160 mAh g-1, respectively. Moreover, the formed Li2Ti2O4 nanodots facilitate reversed Li+ insertion-extraction during the cycling process. The above results indicate the best performance of TiO2-based materials as anodes for lithium-ion batteries reported in the literature.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 26 Feb 2020 21:59
Last Modified: 02 Mar 2021 06:26
DOI: 10.1093/nsr/nwaa028