The Truth About Cars » Supercapacitors http://www.thetruthaboutcars.com The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. Thu, 17 Jul 2014 20:36:40 +0000 en-US hourly 1 http://wordpress.org/?v=3.9.1 The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. The Truth About Cars no The Truth About Cars editors@ttac.com editors@ttac.com (The Truth About Cars) 2006-2009 The Truth About Cars The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. The Truth About Cars » Supercapacitors http://www.thetruthaboutcars.com/wp-content/themes/ttac-theme/images/logo.gif http://www.thetruthaboutcars.com Volvo Capacitive Carbon Fiber Panels Could Replace Batteries, Save Weight In EVs & Conventional Cars http://www.thetruthaboutcars.com/2013/10/volvo-capacitive-carbon-fiber-panels-could-replace-batteries-save-weight-in-evs-conventional-cars/ http://www.thetruthaboutcars.com/2013/10/volvo-capacitive-carbon-fiber-panels-could-replace-batteries-save-weight-in-evs-conventional-cars/#comments Thu, 24 Oct 2013 10:30:51 +0000 http://www.thetruthaboutcars.com/?p=632762 volvobatterybodypanels-7-640x353

That CFRP cowl panel is really storing electricity.

BMW is using carbon fiber composite unibodies for the electric i3 and i8 models to reduce their weight, thereby increasing their range. Now, Volvo is using carbon fiber in a novel way for EVs. Using carbon fiber it has developed a composite material that acts as a capacitor, storing electrical energy, so theoretically body panels and structural components could act as battery equivalents. Unlike conventional batteries, which add weight to a vehicle, the carbon fiber capacitive body panels wouldn’t just power the vehicles but also reduce weight.

To demonstrate the technology, Volvo replaced the the trunk lid, door panels, cowl, and hood of an S80 with the new composite. The panels are made of multiple layers of carbon fiber, insulated from each other with layers of fiberglass. The fiberglass acts as a dielectric with the layers of carbon fiber performing the tasks of the anode and cathode in a conventional capacitor.

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Volvo estimates that replacing an EV’s entire battery pack with capacitive panels would reduce total vehicle weight by 15%.  It would also help in packaging. One criticism of the Chevy Volt is that its large centrally mounted battery pack turns a five passenger platform into a four passenger car. If the car’s structure is the power source, space formerly used for batteries can be put to better use.

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There are possibilities for conventional vehicles as well, with the potential to replace the heavy 12 volt starter battery with just a few capacitive carbon fiber panels.

There are possible drawbacks, including cost and safety. Carbon fiber is expensive to work with so panels would be costly to make and to replace. Also, in the event of a collision that damages the panels’ electrical safety could be a concern.

As usual, there was no world on when, or if, this technology will ever see its way to a production vehicle.

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Are Graphene Micro-Supercapacitors An EV Gamechanger? http://www.thetruthaboutcars.com/2013/02/are-graphene-micro-supercapacitors-an-ev-gamechanger/ http://www.thetruthaboutcars.com/2013/02/are-graphene-micro-supercapacitors-an-ev-gamechanger/#comments Mon, 25 Feb 2013 13:30:29 +0000 http://www.thetruthaboutcars.com/?p=478801 Micro-supercapacitor-prv UCLA Photo

Energy density isn’t the only reason why battery-powered cars have never caught on. As was highlighted in Tesla’s somewhat less than successful media road trip, the amount of time it takes to fill batteries with electrons can be as significant a factor in the practicality of EVs as the amount of electrons those batteries can hold.

That’s one of the reasons why high power capacitors, also known as supercapacitors or ultracapacitors, have held promise – caps can charge and discharge very quickly. That promise, though, has been held back by the old bugaboo of energy density. Capacitors unfortunately have limited capacity. Researchers at UCLA who had previously announced the almost accidental discovery of a simple and inexpensive method of creating graphene sheets, which have ideal properties for fabricating ultracapacitors, have now published the results of their further research, demonstrating a scalable process for fabricating flexible graphene micro-supercapacitors that have some of the highest energy densities achieved yet for such capacitors.

 

Click here to view the embedded video.

The team, led by Richard Kaner, is developing the devices out of one of those fortuitous discoveries that expands the frontiers of science, like penicillin or nylon. Maher El-Kady, of Kaner’s lab, had invented an elegantly simple and inexpensive method of making graphene, a single atom thick sheet of carbon atoms arranged in that hexagonal latice that C loves so well. He poured out a layer of graphite oxide solution on a plastic substrate and then exposed it to laser light. The process wasn’t the most clever thing about El-Kaner’s discovery, it was the equipment that he used. El-Kaner’s substrates were DVDs and he used a standard consumer grade LightScribe DVD burner for the laser. Refining the process, the team has now figured out a way to embed electrodes into the graphene, which is formulated over a flexible film, and they claim energy density comparable to current thin-film lithium ion batteries.

Often “scalable” means scaling up, but Kaner and El-Kady discovered that scaling down has advantanges. Miniaturizing the devices enhances charge storage capacity and charge/discharge rate and it also allowed them to produce more than 100 micro-supercapacitors on a single disc in 30 min or less. The flexible substrate allows for packaging options and the size means that they can be mounted on the back of solar cells or other chips.

As is always the case with potential energy gamechangers, the research team is looking for partners to produce their invention in industrial quantities. While the initial applications will likely not be for transportation, any development concerning electrical storage that combines enhanced energy density, faster charge/discharge rates, and lightweight miniaturization is bound to attract attention from the EV crowd.

UCLA press release here.

Ronnie Schreiber edits Cars In Depth, a realistic perspective on cars & car culture and the original 3D car site. If you found this post worthwhile, you can dig deeper at Cars In Depth. If the 3D thing freaks you out, don’t worry, all the photo and video players in use at the site have mono options. Thanks for reading – RJS

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