Unprecedented and highly stable lithium storage capacity of (001) faceted nanosheet-constructed hierarchically porous TiO2/rGO hybrid architecture for high-performance Li-ion batteries

Wen Bei Yu, Zhi Yi Hu, Jun Jin, Min Yi, Min Yan, Yu Li, Hong En Wang, Huan Xin Gao, Li Qiang Mai, Tawfique Hasan, Bai Xiang Xu, Dong Liang Peng, Gustaaf Van Tendeloo, Bao Lian Su

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Abstract

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.

Original languageEnglish
Pages (from-to)1046-1058
Number of pages13
JournalNational Science Review
Volume7
Issue number6
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • (001) faceted TiOnanosheets
  • LiTiOcrystallites
  • porous hierarchy
  • reduced graphene oxide
  • unprecedented lithium storage capacity

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