电池里的电,究竟是怎样被使用的?

【电池里的电,究竟是怎样被使用的?】伦敦大学学院的工程师们使用X光技术来捕捉使用电池时其中的3D图像变化。通过波音787飞机电池着火事件,这个团队使用X光发现电池在使用的时候,其活性和物理层次都会发生巨大的变化。这可以使我们进一步对电池使用进行控制,更安全也更省电。

Real-Time 3D Imaging Shows How Disposable Lithium Batteries Degrade

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We all know that lithium-ion batteries can fail catastrophically. But other batteries can also burst into flames unprovoked, and a team of researchers is using real-time 3D imaging to understand exactly how.

A team of engineers form University College London has been using X-ray imaging techniques to captures 3D views of what happens inside disposable lithium batteries. You might wonder why they’re bothering, but the study was initiated following a fire aboard a Boeing 787 Dreamliner at Heathrow Airport in 2013, which was found to be caused by a disposable lithium battery in the aircraft’s emergency locator transmitter.

Usually, those kinds of batteries are installed and forgotten about, allowing the systems to work indefinitely because of their relatively low power use. But the images acquired by the researchers, shown above, show that what happens inside is worth worrying about a little more.

“On the outside, the batteries look like they are doing their job normally, explains Donal Finegan, one of the researchers, in a press release. “But inside we saw the structure was undergoing great change. Electrical activity was high in some areas of the cell, whereas it was low in others; layers of electrode material separated and cracked. All of these changes in structure affect the flow of electricity and reduce the performance of the cell.”

You can see that damage clearly in the images above, published in Advanced Science, where long cracks form, emanating from the tips of the electrodes. The researchers reckon that the technique should be used to measure the performance of batteries before they’re used in safety-critical situations — like, uh, aeroplanes.

http://www.gizmodo.com.au/2015/12/real-time3d-imaging-shows-how-disposable-lithium-batteries-degrade/


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