A Transparent Lithium-ion Battery-www.hotavxxx.com

Home-Improvement It started a year ago, with one wild thought by Stanford associate professor of materials science and engineering Yi Cui: Wouldnt that be cool if you had a transparent cell phone to carry around? A gadgets exterior casing could easily be made of a transparent material like plastic, of course. But what Cui envisioned was transparent all the wayincluding .ponents. To make things transparent you need the electronics to be transparent, and you also need the batteries to be transparent Yi Cui says. This week, he revealed one of those pieces. In a study in the Proceedings of the National Academy of Sciences on Monday, Cui and a group of graduate students describe a transparent and flexible lithium-ion battery. The prototype battery measures an inch square with a thickness of a few millimeters, and can power an LED light in demonstrations. But the inventors had to over.e significant hurdles to make their vision a reality. Its actually not trivial to make a battery transparent Cui says. The materials that allow conventional batteries to store and release an electric charge efficiently are decidedly not transparent, and tend to be laid out as solid .ponents or in liquid form in order to function. We use the same kind of electrode as lithium ion batteries, but pattern them in the form of a grid. Cui says. The key to transparency is that when Cui makes the electrode material into a slurry and then casts it into the grid shape, the grid lines are so thin that the human eye cant detect them. Two of these grid electrodes are layered over each other, with a transparent gel electrolyte sandwiched between them, to form a .plete battery. The grids are aligned directly atop each other so the battery remains transparent. Adding more layers of electrodes to the structure increases its capacity, and causes only a moderate drop in transparency. Transparent batteries are just the groups latest innovative project. Led by Cui, the Stanford researchers published a paper in 2009 describing how they could make paper-based batteries by coating paper in carbon nanotubes. Their newest creation impressed Angela Belcher, a Professor in MITs Department of Materials Science and Engineering. Its very unique and creative approach, she says. At the moment, Cuis breakthrough is more intriguing than practical; its hard to say what electronics manufacturers could do with a transparent battery once the technology be.es more advanced. The academic world, however, is already buzzing about the potential research applications. A Hitachi power tool battery is almost like a living thing, because there is so much going on in each electrode, says Glenn Amatucci, the director of the Energy Storage Research Group at Rutgers University. But while battery builders have learned how to pack more and more storage capacity into batteries, they havent been able to see all those chemical and electrical reactions as the batteries work. This battery technology could change that, University of Akron electrical engineering professor and battery designer Tom Hartley says. Because it’s transparent, you can see everything thats going on inside. By using microscopes or other analysis tools, scientists who are trying to maximize battery efficiency will be better able to understand batteries workingsand failings About the Author: 相关的主题文章: