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Electrodes are made of high specific capacity for “supercapacitor”

 

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At Stanford University (USA) has been tested promising technique for creating electrodes for “super capacitors” (capacitors electric double layer).

The material for the experiments was based on nanostructured electrodes of graphene and manganese dioxide, which is easy to manufacture, low cost and availability of raw materials. Blanks were formed on the basis of polyester fabric, which is immersed in graphene “ink” dried to a stable coating was applied on top of it, and MnO2.

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Distribution of similar MnO2-electrodes constrains weak electronic and ionic conductivity, leading to low power density. Trying to remedy this, scientists will complicate the above technology, adding one more operation – the creation of a conductive shell made of carbon nanotubes and the polymer.

Measurements showed that the conducting shell increases the specific capacitance of the electrodes immediately MnO2-20 (in the case of nanotubes), or 45 percent, and brings it to a numerical value of 400 F / g In addition, the modified nanostructures of graphene and MnO2 demonstrated excellent useful life, saving more than 95% of its original capacity at the end of 3000 cycles.
In the near future, the authors want to perform similar experiments with electrodes of lithium-ion batteries. “Our method of creating a conductive shell for various electrode materials, which provide a high energy density, but do not realize their potential because of poor conductivity,” – says study participant Guihua Yu (Guihua Yu).