Stockpiles of scrap tyres in the United States of America have decreased 94 per cent since the U.S. Tire Manufacturers Association (USTMA) instigated efforts to re-purpose scrap tyres, reports the trade association. While scrap tyre stockpiles in the USA contained more than a billion tyres in total in 1991, by 2017 these stockpiles had reduced to just 60 million tyres.
Researchers at the US Department of Energy’s Oak Ridge National Laboratory are aiming are advocating tyre pyrolysis as a way of recovering carbon black for use as a graphite substitute in lithium-ion batteries. The goal is to scale up the recovery process and demonstrate applications as anodes for lithium-ion batteries in large-format “pouch cells”. These batteries could then be used in plug-in electric vehicles and to store energy produced by wind and solar sources.