lithium-ion battery
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Researchers increase charging capacity, speed of lithium ion batteries by a factor of ten
It's not every day that we get to write about advancements in battery technology -- much less one as potentially groundbreaking as what a group of engineers at Northwestern University claim to have pulled off. In fact, Professor Harold Kung and his team say they've successfully managed to increase both the charging capacity and speed of lithium ion batteries by a factor of ten. The key, according to Kung, is the movement of the lithium ions nestled between layers of graphene. The speed at which these ions move across a battery's graphene sheets is directly related to how fast a device can recharge. To speed up this process, Kung decided to poke millions of tiny, 10-20nm-sized holes into a mobile battery's graphene layers, thereby providing the ions with a "shortcut" to the next level. As a result, Kung's perforated batteries were able to charge ten times faster than traditional cells, going from zero to hero in 15 minutes. Not satisfied with that achievement alone, Kung and his squad then set about increasing their battery's charging capacity, as well. Here, they increased the density of lithium ions by inserting small clusters of silicon between each graphene slice. This approach allows more ions to gather at the electrode and, by taking advantage of graphene's malleable properties, avoids some of the silicon expansion problems that have plagued previous attempts at capacity enhancement. The result? A battery that can run on a single charge for more than a week. "Now we almost have the best of both worlds," Kung said. "We have much higher energy density because of the silicon, and the sandwiching reduces the capacity loss caused by the silicon expanding and contracting. Even if the silicon clusters break up, the silicon won't be lost." There is, however, a downside, as both charging capacity and speed sharply fell off after 150 charges. But as Kung points out, the increase in charge retention would more than make up for this shortcoming. "Even after 150 charges, which would be one year or more of operation, the battery is still five times more effective than lithium-ion batteries on the market today," he told the BBC. For more technical details, hit up the links below.
College students unveil the Kiira EV, Uganda's first electric car (video)
Take a good look at that lime green hornet pictured above, because it may just herald the dawn of a new era in Ugandan transportation. Known as the Kiira EV, this plug-in was designed by students at Makerere University in Uganda, where electric cars, as you might imagine, are something of a rare commodity. In fact, local media outlets are heralding the Kiira as the first EV ever produced within the central African country, and it's not too shabby, either. On Tuesday, after nearly three years of development, the two-seater successfully completed its first test run, reaching a top speed of 65 kilometers per hour and nimbly making its way up a 55-degree incline. According to Paul Isaac Musasizi, who oversaw the project, the Kiira is capable of maxing out at a speed of 150 kilometers per hour, and can run for up to 80 kilometers on a single charge. Aside from its steering wheel and other accessories, every other component was designed and constructed domestically. Perhaps more important than the Kiira EV's specs, however, is what it symbolizes for Uganda. "When we started the project, we wanted to demonstrate that Uganda has as good talent as that in the US or Germany," Musasizi told Uganda's Daily Monitor. "Now that this is over, we expect and want it to be taken up." It remains to be seen whether the Kiira actually enters production anytime soon, but Musasizi says his team is already working on a 28-seat EV for public transportation, underscoring their commitment to bringing green technology to their country. Hum past the break to see video of the momentous occasion, along with coverage from Uganda's NTV. [Thanks, Roger]
Panasonic, Tesla rekindle romance, strike supply agreement for Model S batteries
Panasonic and Tesla renewed their corporate wedding vows yesterday, with a new supply agreement on lithium-ion batteries. Under the accord, Panasonic will provide Tesla with cells for some 80,000 cars over the next four years, effectively ensuring that the manufacturer will meet its ramped-up production targets for 2012 -- including more than 6,000 orders for its Model S EV. As for the batteries themselves, they'll be made using Panasonic's nickel-type cathode technology, which, according to the company, will offer the highest energy density known. Of course, we're still awaiting for the Model S to actually enter full production, but you can whet your electric appetite with Panasonic's full press release, available after the break.
Nissan's new charging technology will juice your EV in ten minutes, ten years from now
Nearly a month after unveiling its revamped quick charger, Nissan has now announced that it's working on new technology that would make EV charging... well, quicker. A lot quicker. Developed alongside researchers from Japan's Kansai University, the manufacturer's approach would allow drivers to fully charge their plug-ins in just ten minutes, without taking any toll on a lithium-ion battery's storage or voltage. Nissan says it could achieve this by tinkering with a charger's capacitor -- more specifically, by replacing its carbon electrode with one based on a composite of tungsten oxide and vanadium oxide. Industry insiders, however, say this technology may not reach the commercial level for another ten years -- substantially longer than ten minutes.
Fisker's shooting brake Surf EV to make waves at Frankfurt
Frankfurt's ready to hang ten as teaser images of Fisker Automotive's new "shooting brake" electric whip dropped in just in time for the city's automotive show on September 13th. Affectionately nicknamed the Surf, the two-door sedan is the latest incarnation of the Karma, Fisker's range-extended electric vehicle launched last year. Although the company won't release any details on the new ride just yet, we're expecting it to be somewhat similar to the company's former model, which boasts two 150 kW electric motors, a turbocharged 2.0-liter I-4 and a lithium-ion battery. Joining the ranks of other luxury wagons like the Ferrari FF, the Surf's blast-from-the-past design is guaranteed to be a gnarly change from the standard four-door luxury variety, and you can bet we'll be there for the full reveal.
iHome's AirPlay iW1 wireless speaker system available on September 26th, for $300
It's been a while since we first got our hands on the iW1 AirPlay, but it won't be too much longer before iHome's wireless speaker system hits the market. Yesterday, the company announced that the iW1 will be available on September 26th, for $300. For that price, you'll be able to stream music from your iPhone, iPad or iPod Touch, using the system's two three-inch woofers and duo of one-inch tweeters with Bongiovi processing. The six-pound iW1 also boasts a rechargeable lithium ion battery, allowing you to easily tote it to your next house party, and can be wirelessly connected using iHome's Home Connect app, available for free on iTunes. Blast past the break for the full press release, or hit up the source link for more detailed information.
Researchers use graphene and tin sandwich to make better battery electrodes
Graphene, that microscopic chicken wire made of carbon atoms, has a great many theoretical uses. Among these is to improve Lithium-ion battery technologies, and the big brains at the Lawrence Berkeley National Laboratory have created a graphene and tin composite material for use in battery electrodes. When it's baked at 572 degrees Fahrenheit (300 degrees Celsius) the tin turns into nanopillars that widen the gap between the graphene layers. The greater volume of tin provided by these tiny towers improves electrode performance (read: faster charging), and the flexibility of the graphene prevents electrode degradation. Naturally, current prototypes can only maintain capacity over 30 charge cycles -- as opposed to the hundreds required for commercial applications -- so some serious improvement has to happen before we see it strut its stuff in any phones or EVs. This leaves us, once again, extolling the virtues of graphene, but lamenting its exclusively academic application.
Stanford researchers create transparent battery, dream of a see-through iPhone (video)
We've had about all of the transparent displays we can handle. Besides, what good is a screen you can see through if the electronics behind it are as opaque as ever? Thankfully, the fine folks at Stanford are working hard to move us towards a future filled with invisible gadgets. Yi Cui and Yuan Yang led a team that have created a lithium-ion battery that appears transparent. In actuality, the cells are composed of a very fine mesh of electrodes, approximately 35-microns wide, that are small enough to appear invisible to the naked eye. The resulting power packs are cheap and flexible but, currently, can only store about half as much energy as a traditional Li-ion battery. Cui has a particular destination in mind for creation, as he told the college paper, "I want to talk to Steve Jobs about this. I want a transparent iPhone!" Check out the video after the break.
Suzuki unveils Every electric van, bead curtains sold separately
Just when you thought the electric van couldn't get any more stylish, Suzuki went out and raised the bar even higher, with its Every van -- a prototype plug-in that has state felony written all over it. Following in the wake of Mitsubishi's Minicab i-MiEV, this love bus is powered by a lithium-ion battery that can be fully juiced in about five hours, with a cruising range of up to 62 miles. It's also a good 400 pounds heavier than its gas-powered predecessor, though, as Integrity Exports explains, its cargo capacity remains fixed at around 550 pounds. For now, Suzuki is sending out just 13 vehicles to a handful of Japanese dealerships, in the hopes of testing the market before a potential widespread launch. No word yet on when that could happen, but Japan's soccer moms and airport shuttle drivers must be licking their chops.
Car2go brings North America's first all-electric carsharing program to San Diego
When we tried out car2go's carsharing program earlier this year, we knew it was only a matter of time before the service rolled out to other parts of the country. Little did we know, however, that it would be doing so atop a flotilla of EVs. Yesterday, the Daimler subsidiary announced that San Diego will be the next city to adopt car2go, making it the first in North America to boast a completely electric carsharing system. The program will kick off sometime before the end of this year, when 300 Smart Fortwo plug-ins storm the city, each powered by a 30 kW electric propulsion system and a lithium ion battery that promises to last for up to 84 miles on a single charge. Whenever the cars run out of juice, drivers will be able to recharge at any of the 1,000 Blink EV charging stations (due to be installed by the end of 2011), before heading off to windsail, buy white linen pants, or whatever people do under perennial sunshine. Curiosity piqued? Steer past the break for the full press release.
House passes bill protecting Apple, others from lithium batteries classification
The House approved legislation that would prevent the U.S. from enacting a proposed rule limiting lithium-ion battery shipments by classifying the batteries as hazardous materials. The legislation addresses a rule proposed by the Pipeline and Hazardous Materials Safety Administration (PHMSA) along with the Federal Aviation Administration (FAA). The PHMSA rule would cost companies including Apple an initial $1.3 billion to comply with new packaging, training and handling requirements designed to limit overheating and potential explosion of these batteries while in transit. This rule would apply to stand-alone batteries as well as those included in notebooks, mobile phones, and digital cameras. All this discussion stems from both explosions and fires caused by poorly manufactured lithium-ion batteries in electronic devices. Apple experienced trouble in the past with the batteries in select iBook, PowerBook and MacBook Pro models. The battery problem was so pronounced in the PowerBook 5300 that it earned the nickname "Hindenbook". Since those rocky years in the early 2000s, Apple has spent much time and money improving and standardizing lithium battery technology. [Via AppleInsider]
Flexible batteries get the graphene treatment, could be cheaper than other bendy batts
We've been talking about flexible batteries for years now, but a team of Korean researchers have presented a new solution to bendable energy sources that is not only more powerful than standard lithium-ion batteries, but also potentially cheaper to produce than its malleable predecessors -- and unsurprisingly, everyone's favorite wonder material, graphene, is at the heart of the innovation. The rechargeable battery contains a vanadium-oxide cathode, grown on a sheet of graphene paper, an unidentified separator, and an anode made of lithium-coated graphene. According to the folks behind the new power source, it sports higher energy and power density, as well as a better cycle life than the literally stiff competition. Similar advances have also out-performed rigid lithium-ion batteries, but have enlisted carbon nanotubes, a material more expensive to produce than graphene. Of course, like all technological advances, we won't be seeing these things for years, if not decades, so you might as well get used to ye olde standard bearer.
Hitachi claims secret chemical formula will improve battery cathodes, double longevity
Before lithium-ion batteries, portable gadgets were a nightmare, forcing road warriors and Discman-toting teens to either swap disposable cells or deal with rechargables that (with few exceptions) were tricky to recharge. Of course, Li-ion batteries also have a downside: as laptop and cell phone users have no doubt found out, they too become disposable before long. One reason why is that acid in the electrolyte can corrode the cathode material -- and now, Hitachi claims it's found a way to strengthen its own. Using an undisclosed combination of elements to replace some of the manganese used in the company's cathodes, Hitachi claims they can strengthen their crystalline configuration to resist acid, reduce cost, and best of all, double the usable life of a lithium-ion cell to about ten years. We've heard similar claims before, of course, with other battery manufacturers promising us twenty years, but it looks like this technology might make it out of the lab. NEDO, a Japanese government organization, has commissioned Hitachi to bring these batteries to life for industrial applications like wind farms. Cell phones, sadly, will have to wait.
Nissan shows off latest electric car prototype with battery monitoring system, iPhone app
Nissan's started showing off its latest prototype electric car, based on the Versa. This one will house a 108 horsepower / 206 pound-feet electric motor to drive the front wheels, and a 24 kWh, lithium ion battery pack will be fitted under the floor for storing electricity, with an expected range of 100 miles. To top things of nerd-style, the newest prototype will have a navigation system which will show the current life of the battery, and the mile range its current amount of juice will support, and will boast the ability to download info about nearby charging station locations. And need we say, "there's an app for that?" That's right, Nissan also has a working prototype of an iPhone app making the rounds in Japan which would allow users to communicate with their car remotely and find out the state of the battery's charge. Can this get any cooler?Read - Nissan shows off new Versa-based electric vehicle protoypeRead - Nissan dials iPhone for car remote control
Miles Electric's totally electric family sedan one step closer to existence
Miles Electric has confirmed that it's working on a family sedan-sized all electric car for release in North America sometime next year. The car -- which will be released under a different, unknown brandname -- will be a first for the company, which specializes in neighborhood cars that only go up to about 25 miles per hour. The sedan will have a top speed of around 80 miles per hour, and a 100 mile range. It will also require 8-12 hours to fully recharge its dead lithium-ion battery. Miles is currently running the vehicle though crash tests, and expects to see about 300 of them on the road in California sometime next year. The going rate for one of these? About $45,000.
Hitachi recalls 16,000 Sony laptop batteries, too
Oh Hitachi, you too? Joining the ranks now of, well, pretty much anyone wheelin' and dealin' a laptop these days, Hitachi just issued a recall on 16,000 Sony-made lithium-ion batteries shipped mostly to businesses in Japan. So, let's tally it up: if you or your buds are proud owners of a laptop from Dell, Apple, Fujitsu, Lenovo, IBM, Toshiba, Panasonic (are we missing any?) and now Hitachi, you'd best be checking those lists to if you've got a potential burner on your hands. Oh, and be sure to tell your friends and neighbors of this massive general recall, who knows, you could be a hero. Acer, HP, you next?
