PDA

View Full Version : Science news: paper batteries and supercapacitors



Uncle Duke
12-08-2009, 03:57 PM
How about a piece of paper which is both a battery and and supercapacitor? And can be stacked like a ream of paper (since that's what it is)....

Starting last August:

The nanoengineered battery is lightweight, ultra thin, completely flexible, and geared toward meeting the trickiest design and energy requirements of tomorrow's gadgets, implantable medical equipment, and transportation vehicles. Along with its ability to function in temperatures up to 300 degrees Fahrenheit and down to 100 below zero, the device is completely integrated and can be printed like paper. The device is also unique in that it can function as both a high-energy battery and a high-power supercapacitor, which are generally separate components in most electrical systems.
http://www.sciencedaily.com/releases/2007/08/070814085347.htm

And from today:

Stanford scientists are harnessing nanotechnology to quickly produce ultra-lightweight, bendable batteries and supercapacitors in the form of everyday paper. Simply coating a sheet of paper with ink made of carbon nanotubes and silver nanowires makes a highly conductive storage device...
[snip]
The paper supercapacitor may last through 40,000 charge-discharge cycles -- at least an order of magnitude more than lithium batteries. The nanomaterials also make ideal conductors because they move electricity along much more efficiently than ordinary conductors
http://www.sciencedaily.com/releases/2009/12/091207165035.htm

paladin
12-08-2009, 04:28 PM
The problem comes with the current carrying capacity of the nano wires....A number of years ago I had constructed a power supply meant to charge a large capacitor bank....for a laser device...the cables were 4-0....They were connected in reverse by someone who thought that they knew more than I did...and when the power switch was thrown, the 4-0 cables evaporated.

LeeG
12-08-2009, 04:50 PM
just another step closer to the singularity, gotta power the Terminators with something



http://en.wikipedia.org/wiki/Technological_singularity