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Without repurposing and recycling, electric vehicle batteries could lead to mountains of waste as sales of EV's grow.

One obstacle is lack of battery standardization and a design that aids in easy disassembly. Without a standardized battery design that made to be easily disassembled, an automated disassembly line becomes very costly or undoable.

it might make more sense in some cases to recycle the batteries and repurpose those valuable materials into new manufacturing rather than reusing the batteries. “Is it better to get that cobalt out of the battery and make it into new batteries early on?” he says.
Easier disassembly could lead to extracting purer — and, consequently, more valuable — materials from the batteries that can then be sold and / or used to manufacture new batteries.
But, repurposing used EV batteries for solar power storage is another option. Used batteries can typically hold and discharge up to 80 percent of the power it did when it was brand-new.

“If you make it profitable to do it, people will do it. And at this point, there’s no system in place, there’s no infrastructure [for recycling electric vehicle batteries] and so it really is not obvious how profitable a business it’s going to be,” says Linda Gaines, a co-author of the new paper and a systems analyst at the Argonne National Laboratory, a research center operated by the University of Chicago and the US Department of Energy.


https://www.theverge.com/2019/11/6/20951807/electric-vehicles-battery-recycling
 

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Only 5% of lithium batteries are recycled, partly because there isn't much lithium in a lithium battery (unlike lead acid batteries), not to mention even less cobalt and because it is cheaper to mine lithium than recycle it. To get lithium batteries recycled it would have to be legislation to get 'er done. The technology of lithium batteries is too new with many changes yet to come before we reach a plateau where we've got close to standard design and chemistry optimized. We're at a stage that we were at a hundred years ago where most of the world's gold came from Transvaal now it's less than 6% with world wide mining. Most of today's lithium comes from a few areas but it will eventually be world wide. As a result the cost of lithium will match demand and recycling will have to be political and not economic.
 

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But, repurposing used EV batteries for solar power storage is another option. Used batteries can typically hold and discharge up to 80 percent of the power it did when it was brand-new.
Ah, I can see it now... a couple of "junker" BEVs sitting on cement blocks in the back yard, with electric cables snaking from the battery to create backup storage for the solar panels on the roof, so the old homestead can go "off the grid..."

...not in my neighborhood, of course, the Homeowners Association would not allow it ("sniff, sniff " derisively)...
 
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