Friday, August 29, 2014

Old tires may find their way back to cars – in their batteries

Old tires may find their way back to cars – in their batteries


Carbon black from tires reportedly makes a better anode material than the traditional grap...
Carbon black from tires reportedly makes a better anode material than the traditional graphite (Photo: Shutterstock)
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There may soon be a new use for discarded tires ... besides turning them into mattresses for cows, that is. Researchers from the US Department of Energy’s Oak Ridge National Laboratory have devised a method of harvesting the carbon black from them, and using it to make anodes for better-performing lithium-ion batteries.
The process was developed by a team led by Oak Ridge scientists Parans Paranthaman and Amit Naskar. It involves pretreating the tires and then using pyrolysis – the decomposition of organic materials by heat in the absence of oxygen – to recover pyrolytic carbon black material from the rubber.
Carbon black is similar to the graphite commonly used in battery anodes, although unlike graphite, it’s man-made.
A diagram of the carbon black reclamation process
When a lithium-ion battery with one of the carbon black anodes was tested in the lab, it was found to have a higher energy capacity than similar batteries with regular graphite anodes. This quality was attributed at least partly to the porous microstructure of the carbon black, which offers more surface area than that of graphite.
The Oak Ridge team is now working on a pilot project to scale up the process, with an eye towards ultimately licensing the technology to an industrial partner. Once the technique is commercialized, it is estimated that batteries made using it will actually be cheaper than conventional lithium-ions ... plus, of course, the tires will be diverted from sitting in a landfill.

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