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Real physical things never scale linearly over orders of magnitude.... and since the surface area of a capacitor is directly proportional to its energy density, I see no reason why such a "nano-ultracapacitor" couldn't eventually surpass the energy density of the best batteries.
A startup called Nanotune says its ultracapacitor technology could make electric cars cheaper and extend their range. The company, based in Mountain View, California, has developed a way to make electrodes that results in ultracapacitors with five to seven times as much storage capacity as conventional ones.
Small number, big name.Nanotune, however, which has raised $3 million from the venture capital firm Draper Fisher Jurvetson, says its ultracapacitors are close to competing with batteries in terms of energy storage, and could soon surpass them.
They say they might reach 40Wh/kg by the end of the year. About lead-acid/ni-cad levels. Still a ways to go before matching nimh or li-ion. Price is probably a bigger issue if it wants to be used in hybrids.
They say they might reach 40Wh/kg by the end of the year. About lead-acid/ni-cad levels. Still a ways to go before matching nimh or li-ion. Price is probably a bigger issue if it wants to be used in hybrids.
The article doesn't really indicate whether doubling the capacity, which they hope to achieve by the end of the year, would already make them competitive also on a price basis
Rice University researchers have created a solid-state, nanotube-based supercapacitor that promises to combine the best qualities of high-energy batteries and fast-charging capacitors in a device suitable for extreme environments.
But traditional EDLCs rely on liquid or gel-like electrolytes that can break down in very hot or cold conditions. In Rice's supercapacitor, a solid, nanoscale coat of oxide dielectric material replaces electrolytes entirely.
The researchers also took advantage of scale. The key to high capacitance is giving electrons more surface area to inhabit, and nothing on Earth has more potential for packing a lot of surface area into a small space than carbon nanotubes.
Another day, another university breakthrough.
Lets see the game changing products hit the market already!