Want CNET to notify you of price drops and the latest stories?

The fungus among us: Researchers use fungi to harvest wasted batteries

Using specially developed fungi is far more environmentally friendly than the current method of reclaiming spent battery material.

Andrew Krok Reviews Editor / Cars
Cars are Andrew's jam, as is strawberry. After spending years as a regular ol' car fanatic, he started working his way through the echelons of the automotive industry, starting out as social-media director of a small European-focused garage outside of Chicago. From there, he moved to the editorial side, penning several written features in Total 911 Magazine before becoming a full-time auto writer, first for a local Chicago outlet and then for CNET Cars.
Andrew Krok
2 min read
Daimler Urban eTruck

Folks are usually content to throw batteries and other electronics in the trash when they stop working. Not only is that bad for the environment, metals that could still be useful are relegated to the trash heap, as well. Retrieving those metals is a tricky practice, but researchers are looking to make it easier using certain strains of fungus.

Currently, if you want to get lithium, cobalt and other metals out of used batteries, you have to use harsh chemicals at high temperatures. Researchers from the University of South Florida are working with three different strains of fungus -- Aspergillus niger, Penicillium simplicissimum and Penicillium chrysogenum, for all you biologists out there -- that harvest metals from spent batteries in an environmentally safe way.

The process is relatively straightforward. The batteries are taken apart, and the cathodes are pulverized. The remaining mushy mess is then handed over to the fungi, which generate organic acids that extract the remaining metal from the rest of the cathode material. Initial results are promising, with the acids extracting almost all the lithium and about half the cobalt from that cathode pulp.

The chemicals used for typical metal extraction processes are only half the issue. A good number of batteries and other electronics go to waste every year, ending up in landfills where they're often incinerated and sent into the atmosphere. It's an all-around bad situation, but if a simple, green solution can be found, it could go a long way in reducing that waste.

Of course, there's still a long way to go before these metals can be reused. Once the metals are extracted, they're suspended in liquid acid. USF's researchers are currently figuring out how to get the metals out of that acid. They'd better hustle, because as electric vehicles grow in ubiquity, we're going to have a lot of old batteries on our hands.

Watch this: AutoComplete: Massachusetts to tax Uber, Lyft, and give money to taxis