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posted by martyb on Monday April 06 2015, @08:47PM   Printer-friendly
from the better-hardware dept.

The Register reports

In a paper published at [Proceedings of the National Academy of Sciences] (abstract), the researchers claim capacitance of more than 1,100 Farads per cubic centimetre--or around 1,145 Farads per gram, which is about as much as they reckon you could get out of the manganese dioxide (MnO2) in the cap.

Using a combination of graphene and MnO2, the researchers say the energy density they can achieve can be as high as 42 Watt-hours per litre, which is getting close to that of a lead acid battery.

It's not much yet: the demonstrator pictured below from the UCLA California NanoSystems Institute is one-fifth the thickness of paper, however it can hold charge long enough to power the demo LED overnight.

That, the university claims, beats a thin-film lithium battery on a pound-for-pound (or rather gram-for-gram) basis.

Manganese dioxide is cheap and plentiful, and is good at storing charge--which is why it's popular in dry-cell batteries and alkaline batteries.

The combination of the MnO2 and laser-etched graphene--the secret sauce in all of this--can be produced without dry rooms or extreme temperatures.

 
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  • (Score: -1, Troll) by Anonymous Coward on Monday April 06 2015, @10:58PM

    by Anonymous Coward on Monday April 06 2015, @10:58PM (#167226)

    Now when Obama wants to electrocute the testicles of political dissidents, he can do it for cheap!

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  • (Score: 2) by arslan on Monday April 06 2015, @11:48PM

    by arslan (3462) on Monday April 06 2015, @11:48PM (#167250)

    Is it cheaper than electric eels? You can make some Unagi afterwards as well...

    • (Score: 0) by Anonymous Coward on Tuesday April 07 2015, @09:59AM

      by Anonymous Coward on Tuesday April 07 2015, @09:59AM (#167374)

      https://www.youtube.com/watch?v=0AckvdGbk4w [youtube.com] ... finding an entrance where they can.

    • (Score: 1) by nitehawk214 on Tuesday April 07 2015, @02:09PM

      by nitehawk214 (1304) on Tuesday April 07 2015, @02:09PM (#167446)

      My electrically powered hovercraft is full of eels.

      --
      "Don't you ever miss the days when you used to be nostalgic?" -Loiosh