happydolphin said:
Hehe, you punny. Well, with a piece of graphene oxide the size of a stamp and what a tenth of a milimeter thin, they were able to power a led for 5 minutes. By comparison, the iphone 3G battery has these dimensions: 115.5 x 62.1 x 12.3 mm = 88.222 cubic cm In comparison this graphene oxide sheet used was 30 x 25 x 0.1 mm = 75 cubic mm So, with the graphene oxide sheet fit into an iphone 3G battery, you could power 88,222/75 = 1176 LEDs for 5 minutes. Anyone good in electrical science can compare the wattage of LEDs to the wattage of iPhones? Anyways I'll try. From yahoo answers: Low current LED's go down to 1mA at 1.8V (red) for their rated output, which is 1.8V * 0.001A = 2mW or 0.004W. 1176 LEDs would consume 4.7W What is the wattage of an iPhone? http://www.anandtech.com/show/4971/apple-iphone-4s-review-att-verizon/15
Let's go with 1.3W for the iphone. 4.7W / 1.3W = 3.61 From these newb calculations, it looks like the graphene oxide battery would be 3.61 times as efficient as the current iPhone battery. The cost? Well at 1500$-3000$ per metric ton which si then diluted into a base solution (not sure the cost on that) and repeatedly applied to dirt cheap CDs, this can't be costly I don't think. |
Rather impressive I must say. Well, if they manage to combine those two things they were talking about in the video. That is yet to be seen.
