This new technology carbon nanotube, will greatly increasing the surface area of electrodes and the ability to store energy.

Now the new CNT battery will allowing the devices to retain the power and longevity advantages, while storing about as much energy as the batteries used in hybrids.

The amount of energy CNT battery can hold is related to the surface area and conductivity of their electrodes. Using carbon nanotubes increased the surface area by about 50,000 square centimeters, compared with 2,000 square centimeters using the carbon in a commercial ultracapacitor today. The highly pure carbon nanotubes are also extremely conductive, which will increase power output over existing ultracapacitors, the researchers say.

The CNT technology will find applications beyond hybrids, too. CNT batteries will allow laptops and cell phones to be charged in a minute. And unlike laptop batteries, which start losing their ability to hold a charge after a year or two, they could still be going strong long after the device is obsolete. “Theoretically, there’s no process that would cause the CNT battery to need to be replaced.

Chrysler is celebrating Earth Day today by unveiling the first four of what will be a fleet of 250 battery powered minivans for the US Postal Service. The U.S.P.S. will be using the vans for variety of duties at locations around the country – including daily home delivery.

The vans themselves are based on the concept Town and Country EV that was unveiled last fall by Chrysler. However, because of the duty cycle used by the Postal Service – which generally amounts to only about 18-20 miles per day on a fixed route – these vehicles are being built without the range extender seen on the concept. However, the electric drive portion of the vehicles, including the motor, electronics and A123 System lithium ion battery pack is identical. The head of Chrysler’s ENVI division Lou Rhodes told Autoblog Green this morning that Chrysler is marketing this battery-only version of the van to commercial fleet customers who typically have a shorter range requirements. The extended-range version will be focused on retail customers.

The initial batch of vehicles include a pair of right- and left-hand drive versions, and the total fleet will include a mix. The Postal Service will be using the vehicles for whatever applications they have in different regions of the country. The intent is to evaluate the usability of electric vans, as well as the interaction between the vehicles and the infrastructure. In addition to the post office, Consolidated Edison (Con Ed), Duke Energy, DTE Energy and Electric Power Research Institute (EPRI) will participate in the test program.

Credit: by Sam Abuelsamid on Apr 22nd, 2009