Co[sub 0.56]Ni[sub 0.44] Oxide Nanoflake Materials and Activated Carbon for Asymmetric Supercapacitor

In this work, oxide nanoflakes with a maximum specific capacitance of are successfully synthesized by a facile chemical coprecipitation method. To enhance energy density, an asymmetric supercapacitor with high energy and power density has been constructed with oxide nanoflakes as the positive electrode and activated carbon as the negative electrode. The performance of the asymmetric supercapacitor was characterized by cyclic voltammetry and chronopotentiometry technology. By using the nanoflakes oxides electrode, the asymmetric supercapacitor exhibits high energy density and stable power characteristics; the maximum specific capacitance of and specific energy of are demonstrated for a cell voltage between 0 and .