Abstract Aqueous electrolytes are promising for high performance electrochemical supercapacitors. However, their present narrow electrochemical window, high-cost or toxicity , set limits for wide application. Here, we demonstrate the viability… Click to show full abstract
Abstract Aqueous electrolytes are promising for high performance electrochemical supercapacitors. However, their present narrow electrochemical window, high-cost or toxicity , set limits for wide application. Here, we demonstrate the viability of employing the PEO-strengthened 3 m LiTFSI aqueous electrolytes, which are high-conductive and eco-friendly, for high voltage supercapacitors application. Furthermore, symmetric supercapacitor with 3 m LiTFSI/30 g L−1 PEO is assembled. High operating-voltage of 2.4 V with excellent performance (125 F g−1 at 0.5 A g−1, and 67.3% capacitance retention of 50Ag-1/1 Ag-1) and longevity (>10,000 cycles) are achieved. Therefore, this work provides an effective and promising way to prepare green and high potential window electrolyte for high-voltage operating energy storage devices.
               
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