Via NYTimes

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(Source: Ars Technica; CNET)

At Technology Review’s EmTech conference last week, MIT professor Joel Schindall told the audience at a panel on energy storage why ultracapacitors may have a significant role to play in our transportation future. The good properties of these devices—fast charge/discharge cycles and an essentially unlimited number of cycles—make them a compelling choice for powering an electric vehicle. Schindall also explained why their downside, a far lower charge density than batteries, might not be as much of a problem as it might appear at first glance.

Schindall, who had spent some time away from academics, explained that during his first stint at MIT, a capacitor that could hold 350 Farads would have filled the whole stage. Before he returned, someone working on fuel cells had accidentally produced the first ultracapacitor. Now, with refinements, he was able to walk on stage with a 350 Farad ultracapacitor that was about the size of a D battery. The current generation of devices use activated carbon to hold charges, as its highly complex topology creates a lot of surface area across which charge differences can build up.

Although the improvements have been dramatic, Schindall said that ultracapacitors still badly lag batteries in terms of the storage density, holding only about five percent of the charge per volume of lithium batteris. Which is unfortunate, because they have some properties that would make them excellent for a variety of applications, including very rapid charging and the ability to withstand many more charge cycles than a battery. Schindall claimed they could be recharged indefinitely, since “greater than a million times, to me, is indefinite.”

Schindall’s research group has focused on replacing the disordered structure of activated carbon with a more ordered one that can increase the packing: carbon nanotubes. His research group has developed a vapor deposition process that can grow densely packed, vertically oriented clusters of carbon nanotubes on conducting surfaces. Current industrial processes for the production of carbon nanotubes tend to produce a variety of diameters and lengths, but Schindall told Ars that the process his group has developed keeps everything very regular—he was actually surprised by how even the lengths were.

In the U.S., early-stage companies designing the materials and electrolytes for ultracapacitors include Graphene Energy,EnerG2, and Ioxus. Much hyped EEStor, backed by venture capital firm Kleiner Perkins Caufield & Byers, has signed asupply deal with electric vehicle company Zenn, although its products are still not commercially available.

Compared to batteries, ultracapacitors can’t store a lot of energy, so they wouldn’t typically be used alone to run plug-in electric vehicles. On the other hand, ultracapacitors are “power dense,” which means that they can discharge the energy they do have quickly. Conversely, they can be recharged quickly–in seconds or minutes, and with almost no degradation in performance over time, say backers.

Schindall projects that ultracapacitors eventually will be able to store as much as 25 percent of the energy of batteries, a jump he said would be “disruptive.” Right now, nanostructures developed by MIT researchers can hold twice as much energy as activated carbon. In the coming months, his team expects to show it can hold five times the energy as activated carbon, he said.

Click here to read the entire article.

(Source: TeslaMotors@Twitter)

Looks like the German automaker, Daimler AG (maker of Mercedes vehicles) strongly feels about the growth of electric vehicles in the market.  Early this morning TransportGooru received the hot alert from Tesla’s Tweet that Daimler has acquired 10% of the company.   Sweet Deal!!! It will be a great & mutually beneficial relationship for both parties as it not only provides the much needed financial capital for Tesla, it  also allows for collaborative development of technologies that will be deployed in the future platforms manufactured by either company. 

• German automaker acquires nearly 10 percent of one of the leading electric vehicle companies

• Automakers agreed to cooperate in battery systems, electric drive systems and vehicle projects

The press release on Tesla’s Website is here for you to read..

May 19, 2009 

STUTTGART, Germany, and SAN CARLOS, Calif.

– Daimler AG has acquired an equity stake of nearly 10 percent of Tesla Motors Inc. This investment deepens the relationship between the inventor of the automobile and the newest member of the global auto industry. Tesla is the only production automaker selling a highway capable electric vehicle in North America and Europe.

The two companies have already been working closely to integrate Tesla’s lithium-ion battery packs and charging electronics into the first 1,000 units of Daimler’s electric smart car. In order to benefit from each other’s know-how, the investment enables the partners to collaborate even more closely on the development of battery systems, electric drive systems and in individual vehicle projects.

“Our strategic partnership is an important step to accelerate the commercialization of electric drives globally,” said Dr. Thomas Weber, Member of the Board of Daimler AG, responsible for Group Research and Mercedes-Benz Cars Development. “As a young and dynamic company, Tesla stands for visionary power and pioneering spirit. Together with Daimler’s 120 years of experience in the automotive sector this collaboration is a unique combination of two companies’ strengths. This marks another important milestone in Daimler’s strategy for sustainable mobility.”

“Daimler has set the benchmark for engineering excellence and vehicle quality for more than a century. It is an honor and a powerful endorsement of our technology that Daimler would choose to invest in and partner with Tesla,” said Tesla Chairman, CEO and Product Architect Elon Musk. “Daimler is also on the leading edge in the field of sustainable mobility. Among others the lithium-ion pouch-cell battery developed by Daimler and especially designed for automotive applications is of interest to us. We are looking forward to a strategic cooperation in a number of areas including leveraging Daimler’s engineering, production and supply chain expertise. This will accelerate bringing our Tesla Model S to production and ensure that it is a superlative vehicle on all levels.”

Image Courtesy: Tesla Motors

Together on the road to electro-mobility

As part of the collaboration, Prof. Herbert Kohler, Vice President E-Drive and Future Mobility at Daimler AG, will take a seat on Tesla’s board of directors. 

This long-term partnership with Tesla complements Daimler’s multi-facetted strategy to advance the electrification of the automobile.

Daimler is also moving forward the industrialization of lithium-ion technology. In March, the company founded the Deutsche Accumotive GmbH, a joint venture with Evonik Industries AG. As a result, Daimler is the first vehicle manufacturer worldwide that develops, produces and markets batteries for automotive applications. This is based on a Daimler stockholding in Li-Tec, the German specialist for lithium-ion battery cells.

100 smart electric cars have already been undergoing large-scale trials in London since 2007. These electric vehicles are being tested in day-to-day assignments by fleet operators and private customers.

The Tesla Model S builds upon the success of the Tesla Roadster by leveraging its technology into the world’s first fully electric sedan. Based in Silicon Valley, Tesla unveiled the Model S in March and plans to produce it in California starting in late 2011.