Preparation of Carbon Supported Manganese Dioxide and Its Application for Lithium Ion Supercapacitor

A new electrode material, carbon aerogel supported manganese dioxide (AG-MnO2) has been prepared Psychochemical and electrochemical characterizations indicated that the electrochemical performance of carbon aerogel can be dramatically improved only through depositing manganese dioxide on its surface A novel hybrid supercapacitor using AG-MnO2 and LiMn2O4 as negative and positive electrodes has been developed The effect of operating potential window of negative electrode on the performance of the hybrid supercapacitor has also been investigated in this paper The results showed that combined high capacitance AG-MnO2 material with a wide operating potential window of the negative electrode, the energy density of hybrid supercapacitor can reach to 92 Wh.kg(-1) (based on active material mass of positive and negative electrodes), almost five times higher than that of carbon supercapacitor After 1000 cycles, the capacitance of this new hybrid supercapacitor still remained above 80% of original value