期刊
JOURNAL OF POWER SOURCES
卷 361, 期 -, 页码 80-86出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.06.023
关键词
Lithium ion batteries; High-rate capability; T-Nb2O5 anode; Li+ intercalation pseudocapacitance
资金
- National Natural Science Foundation of China [51472065]
- Harbin Institute of Technology (HIT)
- Nanomaterials and Energy Group at University of Western Ontario
Orthorhombic Niobium oxide (T-Nb2O5) has been regarded as a promising anode material for high-rate lithium ion batteries (LIBs) due to its potential to operate at high rates with improved safety and high theoretical capacity of 200 mA h g(-1). Herein, three-dimensionally ordered macroporous (3DOM) T-Nb2O5, with mesoporous hierarchical structure, was firstly prepared by a simple approach employing self -assembly polystyrene (PS) microspheres as hard templates. The obtained T-Nb2O5 anode material presents obvious and highly-efficiency pseudocapacitive Li+ intercalation behaviour, which plays a dominant role in the kinetics of electrode process. As a result, rapid Li+ intercalation/de-intercalation are achieved, leading to excellent rate capability and long cycle life. The 3DOM T-Nb2O5 shows a remarkable high capacity of 106 and 77 mA h g(-1) at the rate of 20C and 50C. The work presented herein holds great promise for future design of material structure, and demonstrates the great potential of T-Nb2O5 as a practical high-rate anode material for LIBs. (C) 2017 Published by Elsevier B.V.
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