Recycling is, mathematically speaking, the obvious answer to the fact that we can't just keep digging stuff out of the ground forever. But economically? That's where things get dicey. Virgin materials often undercut recycled ones on price, and with tech as fast-moving as electric vehicles, there's an added twist: by the time a car is scrapped, the industry might have already moved on to a different battery chemistry, making the old battery about as valuable as a used napkin.
Still, a new study led by Xin Xiong at Nanjing University suggests that in China, recycling could become the dominant source of many key materials for EV manufacturing in the coming decades. The researchers modeled how recycled supply stacks up against manufacturing demand from 2010 to 2050, covering battery materials for hybrids, battery-electrics, and even fuel-cell vehicles - lithium, cobalt, nickel, manganese, phosphorus, sodium, sulfur, and graphite - plus motor elements like copper, neodymium, dysprosium, samarium, and cerium.
They ran four scenarios for how battery and motor tech might evolve, from slow shifts to solid-state lithium and sodium batteries, to fast transitions with motors using fewer rare earths. The model calculates each element's 'circularity potential' - what share of manufacturing demand can be met by recycled material that same year. It also factors in recent Chinese policies aiming to boost recycling rates of certain battery elements from the current 40 percent to at least 98 percent, and to raise EVs' share of new sales from 45 percent to 60 percent by 2030.
In the model, hybrids and plug-in hybrids eventually fade out, but battery-electric sales keep climbing right up to 2050. That means the number of vehicles hitting the recycler lags behind but steadily grows - especially since the model assumes batteries will be replaced often due to capacity loss before a vehicle's end of life, particularly in heavy commercial use. Add China's battery-swapping stations into the mix, and you've got extra batteries being manufactured and recycled.
Across all scenarios, recycling generally rises to meet a pretty hefty chunk of manufacturing demand, though the patterns vary. Early on, recycled supply climbs as the EV boom eventually produces a corresponding boom in dead EVs. But for some elements like cobalt, demand can drop as the industry pivots to low-cobalt chemistries, and suddenly recycled supply is overflowing. Conversely, nickel and manganese needs could balloon, keeping the recycled share relatively flat.
The motor elements tell a similar story, but they're sensitive to tech changes - like if cerium starts displacing pricier rare earths. Depending on which scenario you buy, the model shows which demands recycling can cover and which will still require good old-fashioned mining.
Of course, all this hinges on the word 'effective' in 'effective recycling.' The researchers point out several weak links that need shoring up to hit the high end of their numbers. China is already using regulations to help - mandating 'battery passports' that identify each battery's chemistry, and pushing more scrapped batteries toward licensed recyclers. But they note China hasn't yet required a minimum level of recycled content in new batteries. And the complex recycling chain could hit bottlenecks as it scales up to handle more EVs.
Just as graphite in batteries often isn't recycled now because it's cheap, new tech like sodium batteries could be a double-edged sword: cheaper batteries are great, but they give recyclers less valuable stuff to work with. Nevertheless, despite the complications, the model suggests the math could work out pretty well for many materials.