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Supercapacitor 1970s developed an energy storage element, it has battery power density of more than ten times higher than the the electrostatic capacitor high number of times the energy density and fast charge and discharge rate of the environmentally pollution, long cycle life, etc., is expected to become a new type of green energy in the 21st century. In the the super capacitors development process, the choice of electrode materials is critical to the performance of the supercapacitor. In recent years, increasing emphasis on research and exploration of the the compound oxides and hydroxides of Ni, Co, Mn, and achieved a certain amount of research. This article by sol - gel method and high-temperature solid-phase method synthesized K 0.27 MnO 2 · 0.6H 2 O, and through the Ni , Co, Mn series hydroxide the doping modification to prepare a potassium-doped Ni, Co, Mn series oxide. The main contents include: (1) K 0.27 MnO 2 · 0.6H 2 O Preparation and Characterization of the structure and performance: by sol - condensate rubber and high-temperature solid-phase method were prepared K 0.27 of MnO 2 · 0.6H 2 O, by XRD, SEM sample morphology and The structure was characterized. The results showed that the samples synthesized by the two methods has a layered structure, the smaller the particle size of the sample by the sol - gel synthesis of samples than the high temperature solid state synthesis. Cyclic voltammetry and constant current charge-discharge tests to characterize the electrochemical properties of the sample. The results showed that both samples have a typical capacitance characteristics, can be used as a super-capacitor electrode material, synthesized by the sol - gel method sample having a relatively high specific capacitance and good cycle performance. (2) 1/2MnOOH 1/2Ni (OH) 2 and Ni of 1/3 the Co. 1/3 the Mn 1 / 3 OOH potassium-doped electrode materials Electrochemical Capacitance Performance: were synthesized by co-precipitation method the the precursor 1/2MnOOH 1/2Ni (OH) 2 and Ni , 1/3 Co 1/3 Mn 1/3 OOH, these two precursors, respectively, and anhydrous potassium carbonate according to a certain proportion of mixed calcined at a high temperature, and the calcined product was washed with water several times to remove the excess potassium carbonate, potassium-doped Ni, Mn oxide and Ni, Co, Mn oxide were obtained after drying. Were characterized by XRD, SEM, these two samples, the results showed that the two samples have similar K 0.27 MnO 2 · 0.6H 2 O of the layered structure. Cyclic voltammetry and constant current charge-discharge tests showed that the two samples have capacitance characteristics, lower scan speed, cyclic voltammetry curves better rectangular features.
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