Ever wonder why some expensive lithium ion batteries go dead after a certain number of charges? Mystery solved. Scientists now know the culprit is nickel, which is added during the manufacturing process to increase the battery's capacity.
有沒(méi)有想過(guò)為什么昂貴的鋰離子電池在使用一段時(shí)間后就會(huì)失效。所有的謎都已解開(kāi)。現(xiàn)在科學(xué)家們知道了鎳就是罪魁禍?zhǔn)住陔姵厣a(chǎn)過(guò)程中加入鎳會(huì)增加電池的容量。
At the atomic level, in the many batteries that use lithium-nickel-manganese oxide, the manganese and oxygen atoms form orderly rows. During normal operation, lithium ions zip up and down the empty channels in between the rows to charge or discharge the battery.
在許多含有鋰鎳錳氧化物的電池里,錳和氧原子形成整齊的序列。在正常操作情況下,鋰離子上下來(lái)回壓縮序列之間的空隙,以使電池充電放電。
Researchers thought that the added nickel atoms were distributed evenly among the rows. However, a team led by scientists at Pacific Northwest National Laboratories has new high-resolution 3-D images that tell a different story. Rather than being evenly distributed, the nickel clumps together and blocks the channels, preventing the flow of ions and keeping the battery from charging. The research is published in the journal Nano Letters.
研究人員認(rèn)為電池里添加的鎳原子均勻分布于錳氧原子序列中。然而,太平洋西北國(guó)家實(shí)驗(yàn)室的科學(xué)家領(lǐng)導(dǎo)的團(tuán)隊(duì)拍攝的一組三維高分辨率的圖像推翻了這個(gè)觀點(diǎn)。鎳原子聚集并堵塞了空隙,阻止了鋰離子運(yùn)動(dòng),從而讓電池?zé)o法充上電。這項(xiàng)研究發(fā)表在《納米快報(bào)》期刊上。
The nickel blockage appears to be a result of the manufacturing process. So identifying and controlling manufacturing conditions may one day make batteries last longer. And keep your current current.
看起來(lái),鎳原子堵塞是由于制造過(guò)程不精密引起的。因此識(shí)別并控制制造條件也許能讓電池更持久。并讓電流保持暢通。
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