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Materials engineers at Monash University in Australia have devised a method of producing graphene supercapacitors that have the same energy density as the lead-acid battery under your car’s hood. Not only are these supercapacitors about 10 times more energy-dense than commercial devices, but the method of producing the graphene inside the supercapacitors seems to be novel as well. The engineers say they used a process that is similar to traditional paper making — and that it could easily and cost-effectively scaled up for commercial production of graphene, and graphene-based supercaps.
Supercapacitors are essentially small batteries that can recharge and discharge almost instantly. While this results in a very high power density (lots of watts), their energy density is generally very low (watt-hours). For a conventional supercapacitor, we’re talking about a power density that’s 10-20 times higher than a conventional lithium-ion or lead-acid battery — but on the flip side, the energy density is 10-20 times worse. In short, supercapacitors are fantastic for when you need a short burst of energy — such as a quick burst of acceleration from a car’s kinetic energy recovery system (KERS) — but useless for powering everyday consumer electronics, like your smartphone.
Graphene, however, could change all that. The amount of energy stored by an electrochemical capacitor is closely tied to the amount of charge-carrying electrolyte that contacts the electrodes. The higher the surface area of the electrodes, the more charge-carrying ions that can be adsorbed (attached) to the electrodes, thus storing more energy. You can probably see where this is going. Because graphene is the thinnest known substance, it is capable of providing an astonishingly large surface area; somewhere on the order of thousands of square meters (that’s multiple tennis courts) per gram. The surface area is so large that graphene could be used to create supercapacitors that bridge the massive energy density gap between supercaps and batteries, while still retaining huge power density.
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Originally posted by Monkeygod333
We will only see these products decades from now when their patents have long since expired. Duracel and the like will see to that I am sure.
Originally posted by grey580
This could be a game changer right here.
A battery for your phone with the same kind of power as a lead acid battery.
In a small size because the graphene is so thin that in a gram you can have the same area as a bunch of tennis ball courts in a gram.
And can hold 90% of it's charge for some 300 hours.
Iene could be used to create supercapacitors that bridge the massive energy density gap between supercaps and batteries, while still retaining huge power density.
Originally posted by XL5
Beckybecky, it can be used as a battery even with that problem. If the energy is there, its there, it doesn't just go away. Sure a boost converter to keep the voltage from sagging would be used to get all the energy out, but if it lasts as long as they say it does, that extra cost will not matter much.
As for shorting the leads, you are not suppose to short the leads on anything that carries that much power anyway. Crashing a plane into the ground is also bad news, people don't stop flying because of that though.