期刊
ELECTROCHIMICA ACTA
卷 114, 期 -, 页码 726-735出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.10.113
关键词
Nickel cobaltite; Capacitors; Hybrid; Anode; Sodium-ion
资金
- National Basic Research Program of China [2012CB932800, 2011CB935702]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars and State Education Ministry (SRF for ROCS, SEM)
- Chinese Academy of Sciences
Sodium (Na)-ion-based energy storage devices have been regarded as a promising alternative to the traditional lithium (Li)-ion-based energy systems because of the more abundant Na reserves on the earth. This work, we have made an investigation about spinel nickel cobaltite (NiCo2O4) as an anode material for Na-ion capacitors (NICs). The NiCo2O4 materials have been fabricated via a facile and scalable chemical deposition route. The obtained NiCo2O4 materials display a typical agglomerate porous morphology with large specific surface area (190.1 m(2) g(-1)) and high mesopore volume (0.943 cm(3) g(-1)). The NiCo2O4 electrode was found to show non-preferable Na-ion insertion/extraction behavior under the full charge/discharge condition. The designed 3.0-V class NiCo2O4/activated carbon (AC) hybrid capacitor exhibits a much superior performance to the theoretical 4.3-V class capacitor, owing to the effective control of Na-ion insertion/extraction reactions in the NiCo2O4 electrode. The mass-optimized (1:1)3.0-V class capacitor exhibits desirable energy and power performances (13.8 Wh kg(-1), 308 W kg(-1) at 0.4A g(-1)), good cycling stability (61.2% energy retention after 2000 cycles at 0.15 A g(-1)) and excellent Coulombic efficiency (almost at 100%), indicating a potential application of spinel NiCo2O4 for NICs. (C) 2013 Elsevier Ltd. All rights reserved.
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