Journal
BATTERIES & SUPERCAPS
Volume 2, Issue 11, Pages 918-923Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/batt.201900079
Keywords
nonaqueous; Na-ion; hybrid micro-supercapacitor; potential window; energy density
Funding
- Initiative and Networking Fund of the German Helmholtz Association, Helmholtz International Research School for Nanoelectronic Networks NanoNet [VH-KO-606]
- European Union's Horizon 2020 research and innovation programme [785219]
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The increasing demand on smart miniaturized electronics has greatly boosted the development of high-performance micro-supercapacitors (MSCs). However, the unsatisfied electrochemical performance (e. g., narrow potential window, low areal energy density) impedes their wide applications. Here, we demonstrate a novel type of nonaqueous Na-ion hybrid MSC, using VS2 nanosheets grown on electrochemically exfoliated graphene (VS2@EG) as the negative electrode and activated carbon as the positive electrode in nonaqueous sodium-ion electrolyte. Such constructed nonaqueous Na-ion hybrid MSCs show a remarkable areal capacitance of 110.7 mF cm(-2) at 0.2 mA cm(-2) in a wide potential range of 0.01-3.5 V and an outstanding areal energy density of 188.3 mu Wh cm(-2). Besides, an impressive cycling stability up to 5000 cycles without noticeable decay is also achieved for the nonaqueous Na-ion hybrid MSCs. This new hybrid MSC holds great potential application in on-chip electronics.
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