Lithium recycling: how Japan recovers 90% of it from used EV batteries

As electric vehicles move from a niche purchase to a mainstream default in much of the world, a quieter problem has been building behind the scenes: what happens to the millions of lithium-ion batteries once they wear out. A team of researchers in Japan says it has developed a method to recover up to 90% of the lithium locked inside those spent batteries, a figure that, if it scales to industrial volumes, could reshape how the world sources one of the most critical materials in modern manufacturing.

Lithium sits at the centre of the battery supply chain for electric vehicles, laptops, phones and grid-scale energy storage, but it is neither evenly distributed around the globe nor simple to extract. The bulk of the world's mined lithium comes from a small number of countries, largely concentrated in South America's high-altitude brine deposits and Australian hard-rock mines, both of which require energy- and water-intensive processes to convert raw ore or brine into battery-grade material.

Recycling has long been proposed as a way to ease that pressure, but lithium recovery has historically lagged behind the recycling rates achieved for other battery metals like cobalt and nickel, which are more valuable per kilogram and have therefore attracted more investment in recovery technology. Lithium, by comparison, has often ended up as a low-priority byproduct of battery recycling, recovered inefficiently or not at all, even as demand for virgin lithium continued to climb.

The new method developed by the Japanese team targets that specific gap, using a refined extraction process to pull lithium out of shredded battery material at rates the researchers describe as dramatically higher than conventional recycling techniques achieve. While the researchers have not disclosed every detail of the chemistry involved, the emphasis on higher throughput and purity suggests the process is designed with industrial-scale deployment in mind, rather than remaining a laboratory curiosity.

The timing matters. Global EV sales have continued to climb year over year, and the batteries sold in the early wave of mass EV adoption roughly a decade ago are now beginning to reach the end of their usable life, creating the first large cohort of retired packs available for recycling. Industry analysts have warned that lithium demand could outstrip newly mined supply within the coming years unless recycling closes a meaningful share of the gap, making methods like this one a matter of supply-chain urgency rather than simply environmental tidiness.

There is also a geopolitical dimension. Countries without significant domestic lithium mining, including Japan, have a strong incentive to develop recycling capacity that reduces dependence on imports from a concentrated set of mining nations, some of which have periodically restricted exports or renegotiated terms with foreign battery manufacturers. A high-yield domestic recycling process offers a partial hedge against that kind of supply disruption.

The environmental case for lithium recycling is separate from, but complementary to, the supply-chain argument. Mining new lithium, particularly from brine operations, requires large volumes of water in often arid regions, and has drawn criticism from local communities and environmental groups concerned about depletion of scarce water resources. Recovering lithium from existing batteries sidesteps that extraction process entirely, reusing material that has already been mined once.

Scaling the technology from a research result to an industrial recycling line is not a small step, and the researchers acknowledge that questions remain around cost efficiency at volume, compatibility with the wide variety of battery chemistries currently in use, and the logistics of collecting and transporting spent batteries safely. Battery recycling more broadly has struggled with these same practical hurdles even where the underlying chemistry has been well understood.

If the method proves viable at scale, researchers say it could meaningfully shift the economics of battery production, making recycled lithium a genuinely competitive input alongside newly mined material rather than a marginal supplement. That shift, industry observers note, would also help battery and vehicle manufacturers reduce the carbon footprint associated with sourcing raw materials, a factor increasingly scrutinised as EVs are marketed partly on their environmental credentials.

For now, the research stands as an early but significant proof of concept in a race that battery manufacturers, mining companies and governments are all watching closely: whether recycling can mature quickly enough to meet a demand curve for lithium that shows no sign of flattening.