This is an interesting concept, but looks more suited for supplemental power -- extending operating time beyond what the normal lithium ion battery delivers -- rather than the primary energy storage device.
You are right now, since its only 1/10th the density of Li-ion today, but the researchers claim that they could rival NiMH very soon and current Li-ion in just a few years. Of course, Li-ion will have moved on by then to even higher densities, and others like Li-air will be on the scene too. Nevertheless for devices that have significantly more volume in their cases than their existing Li-ion battery takes up, building the battery into the case could become the primary power source.
I mentioned: "...there should have been a technology such that the display of the mobile device (or a transparent screen on it...the screen protector itself) to be able to harvest electrical energy from the solar energy to charge the battery of the device, so that my mobile will get charged on the way to my office..."
Hope to see a product around this idea sooner than I expected!!! But, did they stole my idea?.... LOL
Btw...what is the time taken by the super-cap to get completely charged with solar touch scree (patented by Apple)and how long the supercap would hold the charge on typical phone usage?
Similar arguments are made for embedded passives. The super caps either have to get higher DConstants or thinner. Making them thinner reduces breakdown voltage. So in the end, you really can't get there from here. They are useful for what Caps are typically useful for. mitigating current transients. Bah humbug. ;-)
I would have agreed with you before speaking with the Vanderbilt researchers, and they spoke ab out solutions to all the problems you mention including higher DC and making them very thin. There is more info in a paper at:
But its not free. I'll inquire with the author to see if he's got more/better descriptions of how he plans to achieve his goals and get back to you.
what is the time taken by the super-cap to get completely charged with solar touch scree (patented by Apple)and how long the supercap would hold the charge on typical phone usage?--Sanjib.A
Sorry, but Apple's patent is separate from Vanderbilt's work, so no metrics there. The Vanderbilt author claims to have a supercap in his office which has held its charge for two years, but no metrics yet on how long a smartphone-case sized unit would last since it depends on how much bigger the case is than a standart Li-ion battery. If the case is 10-times bigger than the Li-ion batter it houses now, then I would assume it would last just as long in use.
You are right with the technology in its current incarnation, but the researchers claim that they are improving it enough that the volume of the case could contain a supercap large enough to power mobile devices in the future. Their short-term goal is to rival NiMH battery's density with Li-ion in their sights within a few years.
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