HP has realized that it’s been using dodgy batteries in a whole load more notebook PCs, and has issued another recall.
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Nanotech fFor A New Energy Future | www.batteries-charger.com.au
Researchers at the Maryland NanoCenter at the University of Maryland have developed new systems for storing electrical energy derived from alternative sources that are, in some cases, 10 times more efficient than what is commercially available.
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In order to save money and energy, many people are purchasing hybrid electric cars or installing solar panels on the roofs of their homes. But both have a problem — the technology to store the electrical power and energy is inadequate.
Battery systems that fit in cars don’t hold enough energy for driving distances, yet take hours to recharge and don’t give much power for acceleration. Renewable sources like solar and wind deliver significant power only part time, but devices to store their energy are expensive and too inefficient to deliver enough power for surge demand.
Researchers at the Maryland NanoCenter at the University of Maryland have developed new systems for storing electrical energy derived from alternative sources that are, in some cases, 10 times more efficient than what is commercially available. The results of their research are available in a recent issue of Nature Nanotechnology.
“Renewable energy sources like solar and wind provide time-varying, somewhat unpredictable energy supply, which must be captured and stored as electrical energy until demanded,” said Gary Rubloff, director of the University of Maryland’s NanoCenter. “Conventional devices to store and deliver electrical energy – batteries and capacitors — cannot achieve the needed combination of high energy density, high power, and fast recharge that are essential for our energy future.”
Researchers working with Professor Rubloff and his collaborator, Professor Sang Bok Lee, have developed a method to significantly enhance the performance of electrical energy storage devices.
Using new processes central to nanotechnology, they create millions of identical nanostructures with shapes tailored to transport energy as electrons rapidly to and from very large surface areas where they are stored. Materials behave according to physical laws of nature. The Maryland researchers exploit unusual combinations of these behaviors (called self-assembly, self-limiting reaction, and self-alignment) to construct millions — and ultimately billions — of tiny, virtually identical nanostructures to receive, store, and deliver electrical energy.
“These devices exploit unique combinations of materials, processes, and structures to optimize both energy and power density — combinations that, taken together, have real promise for building a viable next-generation technology, and around it, a vital new sector of the tech economy,” Rubloff said.
“The goal for electrical energy storage systems is to simultaneously achieve high power and high energy density to enable the devices to hold large amounts of energy, to deliver that energy at high power, and to recharge rapidly (the complement to high power),” he continued.(Touchscreen Monitor ,Touch Screen LCD Panel )
Electrical energy storage devices fall into three categories. Batteries, particularly lithium ion, store large amounts of energy but cannot provide high power or fast recharge. Electrochemical capacitors (ECCs), also relying on electrochemical phenomena, offer higher power at the price of relatively lower energy density. In contrast, electrostatic capacitors (ESCs) operate by purely physical means, storing charge on the surfaces of two conductors. This makes them capable of high power and fast recharge, but at the price of lower energy density.
The Maryland research team’s new devices are electrostatic nanocapacitors which dramatically increase energy storage density of such devices – by a factor of 10 over that of commercially available devices – without sacrificing the high power they traditionally characteristically offer. This advance brings electrostatic devices to a performance level competitive with electrochemical capacitors and introduces a new player into the field of candidates for next-generation electrical energy storage.
Where will these new nanodevices appear? Lee and Rubloff emphasize that they are developing the technology for mass production as layers of devices that could look like thin panels, similar to solar panels or the flat panel displays we see everywhere, manufactured at low cost. Multiple energy storage panels would be stacked together inside a car battery system or solar panel. In the longer run, they foresee the same nanotechnologies providing new energy capture technology (solar, thermoelectric) that could be fully integrated with storage devices in manufacturing.
This advance follows soon after another accomplishment, the dramatic improvement in performance (energy and power) of electrochemical capacitors (ECC’s), thus ‘supercapacitors,’ by Lee’s research group, published recently in the Journal of the American Chemical Society . Efforts are under way to achieve comparable advances in energy density of lithium (Li) ion batteries but with much higher power density.
“The University of Maryland’s successes are built upon the convergence and collaboration of experts from a wide range of nanoscale science and technology areas with researchers already in the center of energy research,” Rubloff said.(Touch Screen LCD Monitor ,Touch Screen Monitors )
The Research Team
Gary Rubloff is Minta Martin Professor of Engineering in the materials science and engineering department and the Institute for Systems Research at the University of Maryland’s A. James Clark School of Engineering. Sang Bok Lee is associate professor in the Department of Chemistry and Biochemistry at the College of Chemical and Life Sciences and WCU (World Class University Program) professor at KAIST (Korea Advanced Institute of Science and Technology) in Korea. Lee and Rubloff are part of a larger team developing nanotechnology solutions for energy capture, generation, and storage at Maryland. Their collaborators on electrical energy storage include Maryland professors Michael Fuhrer (physics), associate director of the Maryland Nanocenter Reza Ghodssi (electrical and computer engineering), John Cumings (materials science engineering), Ray Adomaitis (chemical and biomolecular engineering), Oded Rabin (materials science and engineering), Janice Reutt-Robey (chemistry), RobertWalker (chemistry), Chunsheng Wang (chemical and biomolecular engineering), Yu-Huang Wang (chemistry) and Ellen Williams (physics), director of the Materials Research Science and Engineering Center at the University of Maryland.
This work was partially supported by the Laboratory for Physical Sciences and by the university’s Materials Research Science and Engineering Center under a grant from the National Science Foundation.
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Welcome to www.batteries-charger.com.au Some laptop and camera components, such as notebook batteries , AC adapters and battery chargers , can be found in usual offline stores, but at a higher price. You can save your time and money buying components for your laptop onour site – up to 30-35% savings on a new laptop battery and other items! http://www.batteries-charger.com.au
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Take a closer look into exposing the Samsung Galaxy S2 battery life|www.batteries-charger.com.au
Samsung has fixed its MRP at Rs 32,890, though its street price is estimated to be slightly under Rs 30,000. It will be available in cellphone stores from June 9.
For those who have read a Samsung Galaxy S2 review, you will know two things, it is most probably the best Android handset on the market, as well as the best smartphone full stop. Those are two big statements, but from what we have heard, there could be an element of truth. However, we thought we would take a closer look into exposing the battery life of said device.
Samsung was able to include a few new features to help battery life in this new handset compared to the older Galaxy S. One way how Samsung was able to do this was due to its new 4.4-inch OLED display, as it does not only use one single backlight. This means that only the pixels needed will be lit, which results in darker blacks – something that is very important if watching videos and conserving battery life.
With this added new feature, users are able to optimize battery life by not going for colorful wallpaper, or choosing to do other things that do not require huge amounts of color. Engadgetfound that from all the current Android handsets on the market, the Galaxy S2 was able to stand up well in battery tests. They found with 20 hours – ten of which were used to play with the phone – there was still 15 percent battery life left.
There are two reasons why it is always hard to squeeze more battery life from a new smartphone; the first is all the extra features, and the second is current battery technology. We as a consumer always want our new handsets to be faster than before, this always comes at a price with how long a battery can last, you only have to look at the Droid Incredible to know what we are talking about.
However, we can rest assured that the likes of Apple, HTC, Samsung and Motorola all have new battery technology in the pipeline, but it is anyone’s guess how long we will have to wait to see it in their future handsets.
Are you impressed with the Samsung Galaxy S2’s battery life?
Samsung wants Galaxy S2 to be the best smartphone in the market. And to achieve its aim, it has used its manufacturing edge to full effect. S2 packs a dual-core Exynos processor running at a zippy 1.2GHz. There is 1GB RAM to make sure that apps get all the memory they require. The phone comes with 16GB storage.
In terms of connectivity, all the usual suspects like 3G, Wi-Fi or DLNA are there. HDMI port, however, is a notable miss. For HDMI connectivity, an adapter will be sold separately for Rs 1,670.
On paper, S2 is a monster. We don’t have too much faith in benchmarks — user experience matters, right — but just to put things in perspective, we used Quadrant, an app that tests theoretical performance of a processor, memory card and gaming capabilities. The phone scored 3370 points, over 900 more than Optimus 2X, India’s first dual-core phone that we reviewed recently. This makes Galaxy S2 the world’s fastest Android phone. At least, in theoretical performance. And, at least, for now.
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Welcome to www.batteries-charger.com.au Some laptop and camera components, such as notebook batteries , AC adapters and battery chargers , can be found in usual offline stores, but at a higher price. You can save your time and money buying components for your laptop onour site – up to 30-35% savings on a new laptop battery and other items! http://www.batteries-charger.com.au
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Q: My question has to do with our 2005 Acura RL and 2008 Acura TL. When we travel and leave one or both cars parked in our garage or in a long-term parking lot, we always return to find the car with a dead battery.
Batteries that Breathe | www.batteries-charger.com.au
With the launch of the Nissan Leaf and Chevy Volt, it’s been a big year for electric vehicles, but their batteries still have a fairly limited range without a recharge. For a car running on today’s lithium-ion batteries to match the range provided by a tank of gasoline, you’d need a lot more batteries, which would weigh down the car and take up too much space.
But what if you could take away one of the electrodes in a battery and replace it with air? Researchers estimate that a lithium-air battery could hold 5 to 10 times as much energy as a lithium-ion battery of the same weight and double the amount for the same volume. In theory, the energy density could be comparable to that of gasoline.
“No other battery has that kind of energy density, so far as we know,” says Ming Au, principal scientist at Savannah River National Laboratory (SRNL), in Aiken, S.C. Au was one of several scientists who reported new research into rechargeable lithium-air batteries during the fall meeting of the Materials Research Society, in Boston.
In such a battery, the anode is made of lithium. The cathode is oxygen, drawn from the surrounding air. As the lithium oxidizes, it releases energy. Pumping electricity into the device reverses the process, expelling the oxygen and leaving pure lithium.
“You can certainly make a lithium-air battery for one-time usage,” says Au. In fact, such lightweight batteries are commonly sold to power hearing aids. “But to make this battery rechargeable is difficult,” he says.
Rechargeable lithium-air batteries face several challenges. For one, lithium reacts violently with water, so the battery’s electrolyte cannot contain any, and water vapor must be separated from incoming air. Turning the lithium oxide—the product of discharging the battery—back to lithium is difficult and only partially possible even when assisted by special catalysts: The oxide builds up and retards the process, limiting the number of charge-discharge cycles to a mere handful. Before lithium-air batteries can find use in hybrid and electric cars, they must be able to handle thousands of such cycles.
As for the time it takes to discharge and recharge the battery, “that process is very sluggish,” says Yang Shao-Horn, associate professor in the Electrochemical Energy Lab at MIT. But she recently reported that she could increase that round-trip efficiency to 77 percent by incorporating nanoparticles of gold and platinum into the cathode end. Gold speeds the combination of oxygen with lithium, and platinum catalyzes their separation.
The SRNL group, meanwhile, is in the midst of a two-year, US $1 million project on lithium-air batteries. So far, they’ve demonstrated a coin-size battery with a capacity of 600 milliampere-hours per gram of material. That’s a leap from traditional lithium-ion batteries, with capacities of 100 to 150 mAh/g. But lithium-ion batteries have about 1000 charge/discharge cycles, and Au’s device tops out at about 50.
It could be many years until a rechargeable lithium-air battery reaches the market. Au points out that lithium-ion batteries were first described in 1976 but weren’t for sale until 1997. “You have to have some big investment from the government or some corporation,” he says. And that hasn’t arrived yet.
About the Author
Welcome to www.batteries-charger.com.au Some laptop and camera components, such as notebook batteries , AC adapters and battery chargers , can be found in usual offline stores, but at a higher price. You can save your time and money buying components for your laptop onour site – up to 30-35% savings on a new laptop battery and other items! http://www.batteries-charger.com.au
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