Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 41, Pages 10460-10467Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201801345
Keywords
carbon fibers; electrospinning; Li-ion capacitors; mesoporous materials; microporous materials
Categories
Funding
- Research Grants Council of Hong Kong [T23-407/13-N]
- National Key Basic Research Program of China [2014CB932400]
- Joint Fund of the National Natural Science Foundation of China [U1401243]
- National Natural Science Foundation of China [51232005]
- Shenzhen Technical Plan Project [J-CYJ20150529164918735, CYJ20170412170911187, QJSCX20160226191136]
- Guangdong Technical Plan Project [2015TX01N011]
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The lithium-ion capacitor (LIC) has been regarded as a promising device that combines the merits of lithium-ion batteries and supercapacitors, and that meets the requirements for both high energy and high power density. The development of advanced electrode materials is the key requirement. Herein, we report the bottom-up synthesis of activated carbon nanofiber (a-PANF) with a hierarchical porous structure and a high degree of graphitization. Electrospinning has been employed to prepare an interconnected fiber network with macropores, and ferric acetylacetonate has been introduced as both a mesopore-creating agent and a graphitic catalyst to increase the degree of graphitization. Furthermore, chemical activation enlarges the specific surface area by producing abundant micropores. Half-cell evaluation of the as-prepared a-PANF gave a discharge capacity of 80mAhg(-1) at 0.1Ag(-1) within 2-4.5V and no capacity fading after 1000 cycles at 2Ag(-1), which represents a significant improvement compared to conventional activated carbon (AC). Furthermore, an as-assembled LIC with a-PANF cathode and Fe3O4 anode showed a superior energy density of 124.6Whkg(-1) at a specific power of 93.8Wkg(-1), which remained at 103.7Whkg(-1) at 4687.5Wkg(-1). This indicates promising application potential of a-PANF as an electrode material for efficient energy storage systems.
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