Journal
IONICS
Volume 25, Issue 12, Pages 6007-6015Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-019-03141-y
Keywords
Cation-intercalated manganese oxide; Asymmetric supercapacitor; Aqueous electrolyte; High voltage
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The main challenge for aqueous asymmetric supercapacitors (ASCs) is the relatively low voltage, which significantly diminishes the energy density of the device. Here, cation-intercalated manganese oxide nanosheets Na0.55Mn2O4 center dot 1.5H(2)O (NaMnO) are synthesized via a facile molten salts method. We find that the electrode potential window for NaMnO nanosheets can be extended to 1.2 V using a low-cost and safe superconcentrated sodium perchlorate (NaClO4) water-in-salt (WIS) electrolyte. To construct the asymmetric supercapacitor, the as-prepared NaMnO nanosheets and activated carbon (AC) with a potential window of - 1.2-0 V are used as the positive and negative electrode, respectively. A high-voltage 2.4-V NaMnO//AC aqueous ASC in the concentrated NaClO4 WIS electrolyte is successfully assembled, which exhibited excellent rate performance (the highest power density of 24.0 kW kg(-1)) as well as good cycling stability (94.9% capacitance retention over 20,000 cycles at 5 A g(-1)). This low-cost WIS electrolyte provides new opportunities for developing high-voltage aqueous ASCs with high energy and high power densities.
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