期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 757, 期 -, 页码 1-7出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2015.09.002
关键词
Anode materials; Ti3+ self-doped Li4Ti5O12; Lithium-ion capacitor
资金
- National Basic Research Program of China (973 Program) [2014CB239701]
- National Natural Science Foundations of China [21173120, 51372116]
- Natural Science Foundations of Jiangsu Province [BK2011030]
- Fundamental Research Funds for the Central Universities of NUAA [NP2014403]
- Outstanding Doctoral Dissertation in NUAA [BCXJ14-10]
- Jiangsu Innovation Program for Graduate Education [KYLX_0255]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
To enhance kinetics of lithium insertion/extraction of anode materials for hybrid lithium-ion capacitors (hybrid LICs), we develop a new applicable strategy toward the synthesis of trivalent Ti self-doped Li4Ti5O12 nanopartides. Starting with Ti2O3, we show that subsequent solid state reaction with Li2CO3 leads to the formation of trivalent Ti self-doped Li4Ti5O12. The presence of trivalent Ti gives rise to high electric conductivity and the nanostructure reduces the transport path lengths of lithium-ions and electrons, permitting fast kinetics for both transported lithium-ions and electrons, thus enabling high-power performance. A high performance hybrid LIC is fabricated by using Ti3+ self-doped Li4Ti5O12 as an insertion-type anode and activated carbon derived from outer peanut shell as cathode, which delivers high energy density (67 Wh kg(-1)), high power density (8000 W kg(-1)). Additionally, the device still retains about 79% of its original capacity even after 5000 cycles at 0.5 A g(-1). (C) 2015 Elsevier B.V. All rights reserved.
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