期刊
JOURNAL OF POWER SOURCES
卷 319, 期 -, 页码 227-234出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.04.033
关键词
TiO2 quantum dots; Bamboo-like porous carbon nanotubes; Anode; Lithium ion battery
资金
- Opened Fund of the Key Laboratory of Xinjiang Uygur Autonomous Region, China [2015KL010]
- excellent Youth Fund of Xinjiang Uygur Autonomous Region of China [2014721005]
- Joint Funds of NSFC-Xinjiang of China [U1303391, U1203292]
- National Natural Science Foundation of China [21362037]
- Xinjiang Autonomous Region Major Projects [201130113-1]
- Doctoral Innovation Program of Xinjiang University [XJUBSCX-2015012]
- Program for Changjiang Scholars and Innovative Research Team in the University of Ministry of Education of China [IRT1081]
TiO2 quantum dots embedded in bamboo-like porous carbon nanotubes have been constructed through the pyrolysis of sulfonated polymer nanotubes and TiO2 hybrids. The TiO2 quantum dots are formed during the pyrolysis, due to the space confinement within the highly cross-linked copolymer networks. The sulfonation degree of the polymer nanotubes is a critical factor to ensure the formation of the unique interpenetrating structure. The nanocomposites exhibit high reversible capacity of 523 mAh g(-1) at 100 mA g(-1), after 200 cycles, excellent rate capability and superior long-term cycling stability at high current density, which could attain a high discharge capacity of 189 mAh g(-1), at 2000 mA g(-1) for up to 2000 cycles. The enhanced electrochemical performance of the nanocomposites benefit from the uniform distribution of TiO2 quantum dots, high electronic conductivity of porous carbons and unique interpenetrating structure, which simultaneously solved the major problems of TiO2 anode facing the pulverization, loss of electrical contact and particle aggregation. (C) 2016 Elsevier B.V. All rights reserved.
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