By Kevin Glowacki

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However, due to the low electrical conductivity of a-MnO2·nH2O, a conducting additive is required to realize a composite electrode for supercapacitors. In this study, taking into account that carbon nanotubes (CNTs) are strongly entangled, forming an interconnected conducting network, we propose to use them as alternative agent to carbon black. e. two electrode cells, based on the a-MnO2/CNTs composites. Therefore, for the first time, the problems of using manganese oxide in symmetric capacitors will be extensively discussed.

In fact, various forms of carbon constitute more than 95% of electrode composition [1]. Double layer capacity and energy storage capacity of the capacitor is directly proportional to the accessible electrode surface, which is defined as surface that is wetted with electrolyte and participating in the electrochemical process. Different types of activated carbon are among the most suitable materials for this purpose. For this reason specialists, involved in development of active materials for EC try to increase carbon’s specific surface as much as possible and to optimize the internal structure of the carbon porous structure.

25 The table shows, that resistance of dry activated carbon is more than 20 times higher than that of the least resistive graphite. In this table, Borondoped natural graphite, 2939APH–RG follows next after activated carbon. More interesting data was found in the mixtures: we have seen that carbon additives tend to reduce specific resistance of the mixture, while active material (activated carbon) increases resistance (54 10-3 ohm·m vs. 49 10-3 ohm·m). This phenomenon suggests that carbon-carbon component mixtures have better “packing” characteristics.

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