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News source: Science and technology daily
According to United States physicist organization network recently reported that the United States researchers have made a new type of super capacitor (DLC), just less than 1 millisecond can be completed in charge, and has been successful in the AC circuit test. Related article in a recent issue of the journal Science. Ultracapacitors also called electric double layer capacitor, is a new type energy storage device, charge can be completed within a few seconds, also has a large capacity, high power, long life, economy and environmental protection and other features, digital cameras, handheld computers, and new energy vehicle areas have a broad application.

Ultracapacitor mainly through the conductor surface to store charge, therefore to store charge charge isolated area of the larger, more intensive, its larger capacity. Currently most of super capacitor using porous structure of activated carbon to expand storage area, this large surface area, with a very small charge separation distance, so that it is a normal capacitor energy storage capacity greater than, and the battery faster than energy transfer. But, in relation to some device, the charging time is still somewhat of a few seconds long.

By the United States JME company (located in the city of Shaker Heights, Ohio, a capacitor company) led by John Miller, Chief Executive of a research team, super capacitor structure, and a new electrode design, making it charge reduced to 200 microseconds (human blink time is about 0.2 seconds at a time of 0.4 seconds, or 200,000 microsecond-400,000 microseconds). New electrode by the United States State of Virginia of the College of William Mary luoen·aoteluo design. Whole consists of a set of perpendicular to the base of the Graphene substrate composition: Graphene substrate has only one atom thick, formed by plasma chemical sediments; its base made from graphite by 10 nanometers thick. Miller called it “a group of 600 nm high potato crisps, stood side by side”. Experiments have shown that was originally made of porous structure of activated carbon super capacitor than new capacitor is more efficient, can be done in less time charging.

According to Miller’s research team says, the new super capacitor can not only replaced 6 times times bigger than its traditional capacitor to create more space, but also to better control circuit voltage fluctuations. In addition, the capacitance is also an AC rectifier filter circuit tests have been successful, and due to the resistivity of porous activated carbon significantly larger than earlier metal, super capacitor used to be considered cannot be used in AC circuits.

Luoen·aoteluo said, the next step they would also seek to make Graphene sheets longer more parallel, to the maximum electric capacity and ion currents in minimum bound to find a balance, making super capacitor work out better performance. And with the weight and size are shrinking, ultracapacitors in more areas such as aviation, aerospace, and military applications.