500-mile electric cars comes one step closer to reality
Washington, July 20 (ANI): UK researchers have revealed that they have made a key step in development of a lithium-air battery, a device that promises three to five times as much energy per unit mass as the existing lithium-ion batteries that we use in our consumer devices and electric vehicles.
Once built, such a battery could allow you to fly cross-country flights with a functioning laptop, or talk for a week without charging your cellphone or even a take a 500-mile journey in a Chevy Volt, for example, instead of the 100 miles it runs today.
The experiment by Peter G. Bruce, professor of chemistry at the University of St. Andrew's in Scotland, and colleagues and published in online journal Science Express, described a chemical reaction that allows the battery to be recharged without degradation of the battery's electrode.
"We have demonstrated that sustainable cycling is possible. That is the real step here. We haven't solved all the practical problems and it's not a solution, but it does demonstrate this critical reaction can be sustained and cycled," Discovery News quoted Bruce as saying.
Scientists are pushing to develop a lithium air battery because they use air as the cathode and lithium metal as the anode. Oxygen is both cheap and light. It doesn't require the battery to be built with heavy casing to contain the electrodes. In existing batteries, lithium ions move from the cathode to the anode through an electrolyte, or a chemical solution. When you use the battery, the process is reversed and the flow of ions produce an electric current.
In a lithium-air battery, oxygen enters the cathode and combines with lithium ions to produce lithium peroxide, which accumulates as the battery is discharged.
The Scottish team was able to produce this chemical reaction over and over again without decomposition, Bruce said, using a thin film of porous gold as an electrode.
Bruce said that his experiment is one of many that have to be successful before this Holy Grail of advanced battery technology is built.
"It's still a long way off. What we've done demonstrates the importance of basic scientific studies in this area. If you rush out and try to make a battery in with knowledge that currently existed you would be unlikely to succeed," Bruce said. (ANI)
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