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Stole this link from Mish
http://www.truckinginfo.com/news/story/2017/12/battery-break...

Quanan Pang, who led the research while a PhD candidate at Waterloo, and his fellow researchers made a breakthrough involving the use of negative electrodes made of lithium metal. The material has the potential to dramatically increase battery storage technology.

In developing the technology, two challenges arose for researchers. The first involved a risk of fires and explosions caused by microscopic structural changes to the lithium metal during repeated charge-discharge cycles. The second involved a reaction that creates corrosion and limits both how well the electrodes work and how long they last.

Researchers were able to solve both problems by adding a compound of phosphorus and sulfure to the electrolyte liquid carrying a charge within batteries.
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