[INFOHIGHTECH] Grâce à l’avènement des composants électroniques élastiques, nous assistons actuellement à la mise au point des produits comme des tissus intelligents, des écrans pliables, et même une peau sensible à la pression pour les robots. Dans de nombreuses applications potentielles, cependant, l’utilité de composants électroniques serait limitée s’ils devaient encore être raccordés à une batterie rigide. En réponse à ce problème, une équipe de scientifiques a récemment créé une batterie extensible au lithium-ion. La recherche a été menée par Yonggang Huang de l’Université de Northwestern et John A.Rogers de l’Université de l’Illinois aux Etats-Unis. La batterie qu’ils ont créé, comprend 100 petits disques rigides d’électrodes disposées en une forme carrée, noyés dans une feuille d’élastomère de silicone extensible. Lorsque la feuille de silicone est étirée et que la distance entre les électrodes augmente, les fils de connexion se déroulent pour combler les écarts.
A Plan to Power 100 Percent of the Planet with Renewables In December leaders from around the world will meet in Copenhagen to try to agree on cutting back greenhouse gas emissions for decades to come. The most effective step to implement that goal would be a massive shift away from fossil fuels to clean, renewable energy sources. If leaders can have confidence that such a transformation is possible, they might commit to an historic agreement. We think they can. A year ago former vice president Al Gore threw down a gauntlet: to repower America with 100 percent carbon-free electricity within 10 years. As the two of us started to evaluate the feasibility of such a change, we took on an even larger challenge: to determine how 100 percent of the world’s energy, for all purposes, could be supplied by wind, water and solar resources, by as early as 2030. Select an option below: Customer Sign In *You must have purchased this issue or have a qualifying subscription to access this content
Charging nickel-based batteries Learn how to maximize charge, minimize heat and reduce memory. Battery manufacturers recommend that new batteries be slow-charged for 16 to 24 hours before use. A slow charge brings all cells in a battery pack to an equal charge level. This is important because each cell within the nickel-cadmium battery may have self-discharged at its own rate. Furthermore, during long storage the electrolyte tends to gravitate to the bottom of the cell and the initial trickle charge helps redistribute the electrolyte to eliminate dry spots on the separator. Battery manufacturers do not fully format the batteries before shipment. Most rechargeable cells include a safety vent that releases excess pressure if incorrectly charged. Full-charge Detection by Temperature Full-charge detection of sealed nickel-based batteries is more complex than that of lead acid and lithium-ion. Chargers relying on temperature inflict harmful overcharges when a fully charged battery is removed and reinserted.
z e a n - Investigación y Difusión de soluciones sustentables, energía renovable, arte, espiritualidad y expresión A Salt and Paper Battery Researchers at Uppsala University in Sweden have made a flexible battery using two common, cheap ingredients: cellulose and salt. The lightweight, rechargeable battery uses thin pieces of paper–pressed mats of tangled cellulose fibers–for electrodes, while a salt solution acts as the electrolyte. The new battery should be cheap, easy to manufacture, and environmentally benign, says lead researcher Maria Stromme. She suggests that it might be used to power cheap medical diagnostics devices or sensors on packaging materials or embedded into fabric. The new battery uses a type of rechargeable thin-film design that many other researchers and companies have been working on for several years. Thin-film batteries typically use solid electrolytes instead of liquid or gel, and their electrodes are typically made of lithium combined with metals such as nickel, cobalt, or manganese. Thin-film batteries have other attractive features. The researchers are now working on optimizing the battery.
“Green Nukes” An Important Climate Change Mitigation Tool Adam Curry interviewed Curt Stager, the author of Deep Future: The Next 100 Years of Life on Earth for his Big Book Show. During the interview, Curry and Stager spent several minutes discussing the potential for “green nukes” to be an important climate change mitigation tool. Aside: Adam Curry interviewed me four years ago about Adams Engines; he has been interested in new nuclear power plants for a long time. End Aside. There are many terrific reasons to favor the rapid development of nuclear fission technology. For some odd reason, possibly having to do with certain brands of political ideology, many nuclear professionals are reluctant to emphasize that last feature. There are also many people employed in nuclear-related activities who are energy agnostics. I have a different point of view. As Curt Stager and other researchers like him have determined, the material will be suspended in our atmosphere and affecting our climate for at least 100,000 years. My plan is to visit Dr. Connect:
PAUL BRAUN, A UNIVERSITY OF ILLINOIS PROFESSOR, ANNOUNCES NEW LITHIUM-ION BATTERY THAT CAN RECHARGE 100 TIMES FASTER CHAMPAIGN, Ill. — The batteries in Illinois professor Paul Braun’s lab look like any others, but they pack a surprise inside. Braun’s group developed a three-dimensional nanostructure for battery cathodes that allows for dramatically faster charging and discharging without sacrificing energy storage capacity. The researchers’ findings will be published in the March 20 advance online edition of the journal Nature Nanotechnology. Aside from quick-charge consumer electronics, batteries that can store a lot of energy, release it fast and recharge quickly are desirable for electric vehicles, medical devices, lasers and military applications. Says Braun, a professor of materials science and engineering, “This system that we have gives you capacitor-like power with battery-like energy. The performance of typical lithium-ion (Li-ion) or nickel metal hydride (NiMH) rechargeable batteries degrades significantly when they are rapidly charged or discharged. Says Professor Braun, The U.S. Responds Braun,
Music Saves Mountains - artists against mountaintop removal coal mining This Microbial Battery Makes Power And Water From Poop And Pollution | Co.Exist | World changing ideas and innovation The idea of sewage-powered devices is not new. In fact, it’s existed for more than a century. But finding a particularly efficient (and cost-effective) version of microbial fuel cell technology has been an ongoing challenge for engineers. A new “microbial battery,” however, looks like a breakthrough on the efficiency side of the equation. Researchers at Stanford University say they’ve developed a battery that can convert some 30% of the energy of dissolved organic matter in wastewater into electricity, the same proportion of energy that solar cells can harvest from sunlight. Here's the science: Researchers Yi Cui, Craig Criddle, Xing Xie, and their team realized that the oxygen in their microbial fuel cell design was causing problems. So the researchers got rid of the membrane setup. Still, there’s a couple of caveats. "It's a very simple device," Criddle says. [Image: Electricity via Shutterstock]
Cost of fuel is major expense for U.S. military Newport, R.I. - When Adm. Gary Roughead sees the price of oil rise by $1 per barrel, he knows it will cost the Navy an additional $33 million for fuel. Roughead, chief of naval operations, and other speakers at the U.S. Naval War College's forum on energy and national security Tuesday, agreed that the nation's dependence on oil is untenable, given the cost, demand and finite supply. They differed, however, on what should be done and how soon. Amory B. "Reinventing fire" is the institute's name for its strategy, detailed in a book to be released this fall, to make the drastic change that Lovins estimated would save more than $5 trillion and alleviate the security, climate and financial risks associated with fossil fuels. Vehicles use most of the oil on which the country spends $2 billion a day, and the government could encourage consumers to buy lighter, fuel-efficient cars with a rebate program, paid for with a fee on inefficient cars, he said. fuel. firstname.lastname@example.org
Recherche : 200 000 cycles de batterie lithium, au bas mot ! - ZDNet Les avancées scientifiques sont le produit de recherches intenses, de protocoles complexes, de rudes efforts. Et parfois c'est une question de coup de bol. Prenez Mya Le Thai, étudiante en chimie de l’université de Californie. C'est en réalisant une expérience destinée à améliorer la résistance des batteries au lithium qu'elle a découvert de manière totalement fortuite une nouvelle méthode révolutionnaire. Les nano-fils positionnés dans les batteries lithium sont de la taille du micron. Ordinateurs, smartphones, tablettes ; les batteries au lithium sont partout et leur durée de vie est bien connue : entre 5 000 et 7 000 cycles en moyenne. "Mya (...) a enduit (les nano-fils) d'une couche de gel très mince et a commencé (l'expérience)" explique Reginald Penner, président du département de chimie de l'UCI. De fait, on passe alors de 7 000 cycles à 200 000 cycles, au minimum.
MindTreeHealth | Problem solving for conscious people