Journal
SMALL
Volume 11, Issue 28, Pages 3476-3484Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201403575
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Funding
- China Postdoctoral Science Foundation [13B10624]
- NSFC [51233001, 51173024]
- SRFDP [20110075110009]
- 111 Project [111-2-04]
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Nitrogen-doped carbon materials have attracted great interest in the energy storage due to the better electrochemical performances than the pristine carbon materials. In this work, a heterocyclic polyimide containing benzopyrrole and benzimidazole rings is carbonized to fabricate the free-standing and flexible carbon membrane (Carbon PI) with a high packing density (0.89 cm(-3)), in which the location of nitrogen atoms in the doped configurations is easily controlled. XPS analysis indicates that quaternary nitrogen is the predominant nitrogen-doped configurations. The high content of nitrogen effectively improves the wettability of the electrode materials. The Carbon PI membrane exhibits excellent volumetric capacitance (159.3 F cm(-3) at 1 A g(-1)), high rate capability (127.5 F cm(-3) at 7 A g(-1)), and long cycle life. TEM images reveal the very slight change of the microstructure of graphitic nanosheet of Carbon PI during the long charge/discharge cycles.
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