Combustion synthesis of battery-type positive electrodes for robust aqueous hybrid supercapacitor.

Abstract

Producing materials with suitable features including robust, and high electrical conductivity for the realization of excellent electrochemical performance for supercapacitor devices remains a great challenge. In this regard, we optimize and used the combustion synthesis technique assisted with urea for the production of a positive electrode based on battery type lithium manganese oxide (LiMnO) and activated carbon as negative electrode materials for high voltage hybrid devices in aqueous electrolytes. The samples were analyzed with X-ray diffraction, Raman spectroscopy, and scanning electron microscopy. The structural properties of the material were studied and hybrid devices fabricated present a specific capacitance of 65 F g−1 and 78 F g−1, at 0.5 A g−1 in 1 M Li2SO4 and 1 M Na2SO4 respectively, with long-term stability after continuous cycling. These result shows that this strategy can revolutionize new ways to the synthesis of a plethora of materials for high voltage energy storage applications.

Keywords: Electric energy storage Supercapacitors, Double layer capacitors, Activated carbon LiMnO, Electric cars