Investigation Of Peo-Polymer Blend Electrolytes For Electrochemical Capacitors

ABSTRACT

Recently, there has been a drift of attention towards gel polymer based electrolytes owing to the fact that they are cheap and can achieve an extended potential window for improved energy density in supercapacitor devices when compared to aqueous electrolytes. Thus in this regard, the electrochemical characterization of symmetric supercapacitor devices based on different polyethylene oxide (PEO) based gel electrolytes was studied. The gel polymer electrolyte is based on methanol solvent, polyethylene oxide (PEO), lithium perchlorate (LiClO4) and ionic liquid (IL), tetraethylammonium tetrafluoroborate (TEABF 4). Polymer electrolytes with different compositions were prepared by varying the weight percentage of each of the constituents. The EDLC device made with the electrolyte composition of PEO: 10 wt. % LiClO4 + 20 wt. % IL showed a maximum operating voltage window of 2.3 V.A peak capacitance of 54.9 Fg-1 , energy and power density of 23.2 kWh g-1 and 10.8 kW/g were recorded. The enhanced performance were due to the improved conductivity of the electrolytes, which is favourable for fast ion transport.