We've seen countless attempts to build a better lithium-ion battery, but there's been far fewer research efforts devoted solely to figuring out why lithium-ion batteries don't last longer. A team of scientists at the Pacific Northwest National Laboratory have been doing just that, however, and they're now sharing some of their findings. The main culprit, they say, are the nano-sized wires made of bulk tin oxide used in the batteries, which can expand and deform considerably over time, eventually rendering the battery useless. What's more, while the research was focused primarily on examining the cause of battery aging, the researchers do naturally have a few suggestions on how to improve them -- namely, to replace those wires made of bulk tin oxide with finer tin oxide nanowires. As lead scientist Chongmin Wang explains, that would effectively amount to winding together "thinner wires rather than making one thick rope," which is of course easier said than done.
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