All-Carbon Supercapacitor

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Currently supercapacitors are widely used in power electronics and hybrid electric vehicles. The advantages of supercapacitors as energy sources, compared to accumulators are well known: significantly less recharging time and orders of magnitude higher number of charge-discharge cycles.

The main difference between supercapacitors and accumulators is that accumulation and output of electric power in the former is not due to electrochemical reactions, but because of double layer formation on highly developed surface of the capacitor electrodes. The operating voltage of the majority of supercapacitors is in the range of 1.2-2.5 V. They withstand well short-term over-voltage.

There are three types of electrode materials used for supercapacitors: activated carbon materials, metal oxides and conductive polymers. The supercapacitors with activated carbon as the electrode material are the most prevalent due to their low cost, high capacity and stability during prolonged cycling.

Highly porous carbon materials are used as the electrode material due to their high surface area and electrochemical stability; most commonly carbon materials with surface area of 1500-2000 m2 g-1 are utilized. In such devices charge accumulation is based on electric double layer formation due to electrostatic adsorption of ions on the surface of porous carbon electrode.

In AkkoLab LLC we developed an electric double-layer supercapacitor where the electrode materials and the current collectors were fabricated exclusively on the basis of various carbon forms.

Our research group created highly porous carbon materials with surface area of 3200-3800 m2 g-1 (BET) and unique carbon composites as electrode materials were fabricated on their bases.

 

Полностью углеродный суперконденсатор

  

Capacity, F 3700
Maximumoperatingvoltage, V 2.3
Minimumoperatingvoltage, V 0
Energy in operating voltage range, kJ 9.7
Active mass, kg 0.260
Overall dimensions of active part, mm 52×100×100
Active volume, cm3 520
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