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Graphene supercapacitors are one step closer to commercial production
In the laboratory, supercapacitors based on graphene in comparison with conventional traditional already proven their worth. However, scientists from the Australian Monash University (Melbourne) claim to have developed a new and efficient from an economic point of view, the method of production of graphene-based supercapacitors, which makes them one step closer to possible commercial applications.
With a virtually endless supply of life-cycle and the possibility of charging a matter of seconds, supercapacitors have a great potential for use in various fields – from the production of portable electronics, electric vehicles to large factories for the production of renewable energy. True, they have one seemingly small but quite significant drawback – they have a very low specific energy: in the average super-capacitor (or electric double layer capacitors) is something around 5-8 Wh / kg. At the same time they are discharged more quickly than conventional batteries, which means that they require much more frequent recharging.
However, Professor Dan Lee and his team from the Department of studying the production of materials at Monash University have created a graphene supercapacitor whose specific power density of 60 W * h / kg, which is approximately 12 times higher than that of any other conventional supercapacitor presented in this Currently on the market. In this case, a graphene supercapacitor discharges longer than conventional batteries.
To maximize the energy density, a team of scientists has created a graphene-adaptive compact gel film electrode. In order between graphene sheets on subnanometer level remained space scientists used liquid electrolyte which is commonly used as a conductor in conventional supercapacitors.
However, unlike the latter, which are typically used highly porous materials that allow the liquid electrolyte to conduct an electric charge, electrolyte Team Lee has a dual role: it conducts electricity and leaves space between the graphene pieces. This allows increasing the density without compromising the porosity itself supercapacitor.
To create a compact electrode researchers used a method that is very similar to the technique of producing plain paper. According to scientists, in the level of industrial production is less expensive.
“We have created a microscopic graphene material that opens up new horizons. And it is almost at the stage of transition from the laboratory to commercial production, “- said Professor Lee.
The results of these studies were published in the scientific journal Science.
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Tags: Graphene , Graphene capacitors .
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