Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 22, Pages 12583-12592Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.02.214
Keywords
Lithium-ion battery; Anode material; TiNb2O7; Amorphous carbon
Categories
Funding
- National Natural Science Foundation of China [21501101]
- Natural Science Foundation of Henan Province [182300410226]
- Technological Project of Henan Province [172102210426, 182102310068]
- Education Department Project of Henan Province [16A150038]
- Science and Technology Development Program of Jilin Province [20190103003JH]
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The unique ReO3 crystallographic shear structure of TiNb2O7 has enabled its application as anode material for lithium-ion batteries, in which the lattice parameter and volume change of TiNb2O7 are often negligible during lithium-ion insertion/extraction. However, several intrinsic problems of TiNb2O7, including low electronic and ionic conductivity, can restrict its application significantly. In this study, carbon-coated mesoporous TiNb2O7 microspheres are fabricated through a simple solvothermal reaction. By combining the advantages of both the amorphous carbon and mesoporous structure, TiNb2O7/C composite exhibits superior lithium storage performance, with higher rate capability (200 mAh g(-1) at 30 C) and cyclability (191 mAh g(-1) at 10 C after 500 cycles). The improved performance is due mainly to the high pseudocapacitance and low charge transfer resistance obtained from the mesoporous structure and amorphous carbon layer. The study provides a new way of constructing TiNb2O7 for ultra-fast storage devices, demonstrating great potential for application in power batteries. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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