期刊
ENERGY STORAGE MATERIALS
卷 11, 期 -, 页码 8-15出版社
ELSEVIER
DOI: 10.1016/j.ensm.2017.09.006
关键词
Na-ion hybrid capacitors; Quasi-solid-state; Surface-functionalized graphene; Surface oxygen; Energy-power density
资金
- National Key Basic Research Program of China (973 Program) [2014CB239701]
- National Natural Science Foundation of China [51372116, 51504139, 51672128]
- Natural Science Foundation of Jiangsu Province [BK20150739, BK20151468]
- Prospective Joint Research Project of Cooperative Innovation Fund of Jiangsu Province [BY2015003-7]
- Jiangsu Innovation Program for Graduate Education [KYLX16_0341]
- Outstanding Doctoral Dissertation in NUAA [BCXJ16-07]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Simultaneous integration of high power density, high energy density, long cycle life and superior safety in a single energy storage system is still a huge challenge. Addressing this issue requires the design of new energy storage systems with novel electrodes. Herein, we propose a novel electrochemical energy storage device called a quasi-solid-state Na-ion hybrid capacitor (QSS-NIC) based on surface oxygen-functionalized crumpled graphene (OCG) as both the negative and positive electrodes and a Na-ion conducting gel polymer as the electrolyte. The as-prepared OCG with dense and porous structure ensures abundant ion-accessible active sites and short ion diffusion path. The surface oxygen functional groups within OCG are favorable for high energy storage when applied as both battery-type negative electrodes and capacitor-type positive electrodes. Benefiting from the elaborate design of electrode materials and device configuration, the QSS-NIC achieves a high energy density of 121.3 W h kg(-1), high power density of 8000 W kg(-1) and a long cycling life of over 2500 cycles with a capacitance retention of similar to 86.7%. This work successfully demonstrates a proof of concept of quasi-solid-state Na-ion hybrid capacitors as a high performance energy storage device based on two graphene electrodes, which narrows the performance gap between conventional electrochemical capacitors and batteries.
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