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

Authors
Yu, Wen-Bei 
Hu, Zhi-Yi 
Jin, Jun 
Yi, Min 
Yan, Min 

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Article
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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.

Publication Date
2020-06
Online Publication Date
2020-02-20
Acceptance Date
2020-01-30
Keywords
(001) faceted TiO2 nanosheets, Li2Ti2O4 crystallites, porous hierarchy, reduced graphene oxide, unprecedented lithium storage capacity
Journal Title
Natl Sci Rev
Journal ISSN
2095-5138
2053-714X
Volume Title
7
Publisher
Oxford University Press (OUP)
Sponsorship
Changjiang Scholars and Innovative Research Team in University (IRT_15R52)
National Natural Science Foundation of China (U1663225)
National Key R&amp (2016YFA0202603, 2016YFA0202602)