Journal
JOURNAL OF POWER SOURCES
Volume 255, Issue -, Pages 235-241Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.01.017
Keywords
Ultrathin nanosheets; Pre-lithiation; Electrochemical devices; Vanadium oxides; Electrical transport; Lithium batteries
Funding
- National Basic Research Program of China [2013CB934103, 2012CB933003]
- National Natural Science Foundation of China [51272197, 51072153]
- International Science & Technology Cooperation Program of China [2013DFA50840]
- Foundation of State Key Laboratory of Advanced Technology for Materials Synthesis and Processing [2013-ZD-7]
- Fundamental Research Funds for the Central Universities [2012-yb-02]
- Students Innovation and Entrepreneurship Training Program [20131049701007]
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The novel ultrathin pre-lithiated V6O13 nanosheets are prepared through a low-temperature exfoliation in argon followed by a secondary hydrothermal lithiation. The smallest electrochemical devices based on nanosheet cathodes are fabricated to in situ probe the intrinsic advantages of pre-lithiated nanosheets. Pre-lithiated nanosheets show one order of magnitude higher in electrical conductivity compared with non-lithiated nanosheets. The conductance of ultrathin pre-lithiated V6O13 nanosheets still remains at the same level after discharge process while that of ultrathin non-lithiated nanosheets decreases over two orders of magnitude. The electrochemical performances of nanosheet cathodes before and after pre-lithiation are compared to further demonstrate the enhancement of the pre-lithiation. Ultrathin pre-lithiated V6O13 nanosheet cathodes exhibit a high discharge capacity of 301 mAh g(-1) at the current density of 100 rnA g(-1). At a higher current density of 1000 mA g(-1), the capacity retention after 150 cycles of ultrathin V6O13 nanosheet cathodes is greatly improved from 46% to 98% after pre-lithiation. The enhanced electrical conductance, excellent discharge capacities and cycling performance demonstrate the great potential of ultrathin pre-lithiated V6O13 nanosheets in next-generation high-performance energy storage applications. (C) 2014 Elsevier B.V. All rights reserved.
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