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Did Researchers Create Lifetime Batteries?
May 4, 2016 by admin
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Researchers at the University of California at Irvine (UCI) have accidentally – yes, accidentally – discovered a nanowire-based technology that could lead to batteries that can be charged hundreds of thousands of times.
Mya Le Thai, a PhD candidate at the university, explained in a paper published this week that she and her colleagues used nanowires, a material that is several thousand times thinner than a human hair, extremely conductive and has a surface area large enough to support the storage and transfer of electrons.
Nanowires are extremely fragile and don’t usually hold up well to repeated discharging and recharging, or cycling. They expand and grow brittle in a typical lithium-ion battery, but Le Thai’s team fixed this by coating a gold nanowire in a manganese dioxide shell and then placing it in a Plexiglas-like gel to improve its reliability. All by accident.
The breakthrough could lead to laptop, smartphone and tablet batteries that last forever.
Reginald Penner, chairman of UCI’s chemistry department, said: “Mya was playing around and she coated this whole thing with a very thin gel layer and started to cycle it.
“She discovered that just by using this gel she could cycle it hundreds of thousands of times without losing any capacity. That was crazy, because these things typically die in dramatic fashion after 5,000 or 6,000 or 7,000 cycles at most.”
The battery-like structure was tested more than 200,000 times over a three-month span, and the researchers reported no loss of capacity or power.
“The coated electrode holds its shape much better, making it a more reliable option,” Thai said. “This research proves that a nanowire-based battery electrode can have a long lifetime and that we can make these kinds of batteries a reality.”
The breakthrough also paves the way for commercial batteries that could last a lifetime in appliances, cars and spacecraft.
British fuel-cell maker Intelligent Energy Holdings announced earlier this year that it is working on a smartphone battery that will need to be charged only once a week.
Did Researchers Create Batteries That A Lifetime? : :: TheGuruReview.net ::
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Can MB Challenge Tesla?
June 22, 2015 by admin
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On the heels of Tesla announcing a home and commercial battery product line, Mercedes-Benz unveiled its own brand of energy storage products for those with solar systems to store surplus power.
The Mercedes-Benz energy storage plants for private use are available for order now and are expected to ship in September.
The batteries were first developed for cars, but Mercedes-Benz said the energy storage units “meet the very highest safety and quality standards” for home use.
Up to eight battery modules with an energy capacity of 2.5 kWh can be combined into an energy storage plant with a capacity of 20 kWh.
“Households with their own photovoltaic systems can thus buffer surplus solar power virtually free of any losses,” the carmaker said in a statement.
What wasn’t announced by Mercedes-Benz was information about the size of or pricing for the new batteries.
In May, Tesla announced its Powerwall batteries for home use and its Powerpack batteries for commercial use. Today, Tesla CEO Elon Musk announced his company would double the power output of the Powerwall batteries but keep their prices the same.
Tesla’s Powerwall batteries will go from having a two-kilowatt (kW) steady power output and 3.3kW peak output to a 5kW steady output and 7kW peak output, Musk said. The price of the batteries will remain the same: $3,000 for the 7kW/hour (KWh) daily cycle version and $3,500 for the 10kWh backup UPS version. Total installation cost will run around $4,000, according to Musk.
Up to nine Powerwall battery units can be daisy-chained together on a wall to provide up to 90kWh of power.
The average U.S. household uses about 20 kWh to 25 kWh of power every day, according to GTM Research.
Tesla Energy’s new commercial-grade battery is called the Powerpack, and will sell in 100kWh modules for $25,000 each. Musk said the Powerpack can scale infinitely, even powering factories and small cities.
Mercedes-Benz’s batteries, being produced by subsidiary Deutsche Accumotive, are its first industrial-scale lithium-ion units, and they’ve already been tested “on the grid,” the company said.
Samsung’s Eight-core Chip Goes Hacking
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A Samsung eight-core chip used in some Galaxy S4 mobile devices is now available for hackers to play with on a developer board from South Korea-based Hardkernel.
Hardkernel’s Odroid XU board has incorporated Samsung’s eight-core Exynos 5 Octa 5410 chip, which is based on ARM’s latest processor designs. Samsung recently announced a new eight-core chip, the Exynos 5 Octa 5420, which packs faster graphics and application processing than the 5410. The 5420 has not yet been shipped yet, however.
The Odroid board is priced at $149 through Aug. 31, after which it will be offered for $169. Samsung for many months has said that a board with an eight-core chip would be released, and has shown prototype developer boards at conferences.
Odroid-XU will provide developers an opportunity to write programs tuned for Samsung’s octa-core chip, which has been a source of controversy. Analysts have said the eight-core design is overkill for small devices like smartphones and tablets, which need long battery life.
The eight-core chip design also takes up a lot of space, which prevented Samsung from putting LTE radios inside some Galaxy S4 models. Qualcomm, which hesitantly moved from the dual core to the quad-core design on its Snapdragon chips, on Friday criticized eight-core chips, calling the idea “dumb.”
Despite the criticism, the board will give developers a first true glimpse of, and an opportunity to write and test applications for, ARM’s Big.Little design. The design combines high-power cores for demanding applications with low-power cores for mundane tasks like texting and calling.
Samsung’s iteration of Big.Little in the Exynos 5 Octa 5410 chip combines four processors based on ARM’s latest Cortex-A15 processor design, which incorporates four low-power Cortex-A7 CPUs. The Cortex-A15 is ARM’s latest processor design and succeeds the previous Cortex-A9 core, which was used in popular smartphones like Apple’s iPhone and the Galaxy S3. Samsung said the eight-core chip provides a balance of power and performance, with the high-power cores kicking in only when necessary.
The board has an Imagination Technologies PowerVR SGX544MP3 graphics processor, 2GB of low-power DDR3 DRAM, two USB 3.0 ports and four USB 2.0 ports. Other features include Wi-Fi, Ethernet and optional Bluetooth. Google’s Android 4.2 operating system is preloaded, and support for other Linux distributions like Ubuntu is expected soon. The board has already been benchmarked on Ubuntu 13.04.
Google Rewrites Web Pages For Speed
August 2, 2011 by admin
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Google has created a hosted service that analyzes Web pages, rewrites their code to make them perform better and serves them up from Google servers.
To use the Page Speed Service, Web publishers must sign up and point their site’s DNS entry to Google. The service grabs the site’s content, optimizes it for speed and delivers the pages to end users.
Visitors will continue to access a site in the same way as before but could see speed enhancements of 25% to 60%, according to Google.
The service is currently being offered free to a limited number of hand-selected webmasters. Google will announce pricing and other details later. Webmasters can sign up to receive information.
Is Twitter Finally Getting A Competitor?
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Twitter your days alone at the top of the micro-blogging mountain may soon be ending. UberMedia, which owns major third-party mobile applications for the Twitter platform, is said to be building a service that will compete directly against Twitter. If it’s true, the move would come on the heels of Twitter briefly suspending the company’s apps for alleged use policy violations.
Citing unnamed sources, CNN.com reported today that UberMedia is looking to attract users to its own microblogging service by addressing common complaints about Twitter, such as its rules on message lengths as well as how the service can be confusing to new users.
UberMedia declined to comment on whether its programmers are building a new microblogging service. However, in an emailed statement to Computerworld, company marketing chief Steve Chadima said, “Our foremost desire is to continue to innovate on the Twitter platform and bring more users and usage to Twitter.”
UberMedia owns UberTwitter, which is for the BlackBerry platform; Twidroyd, for Android devices; and UberCurrent, which can be used on iPhones and iPads. The company also has been in the news in recent months because it’s moving to acquire popular Twitter client TweetDeck.
TweetDeck competes directly with Twitter’s Web and mobile clients.
Ezra Gottheil, an analyst with Technology Business Research, said he wouldn’t be surprised if UberMedia were to go after some of Twitter’s business, but the company would have an uphill climb.