Japan’s 90% Lithium Trick Is a Chemistry Swap, Not a Miracle — and the Real Bottleneck Has Nothing to Do With Chemistry
Every so often a battery-recycling headline goes around promising that we’ve finally cracked the code on dead EV packs. The latest one comes out of Tsuruga, on Japan’s Fukui coast, where a company called JX Metals Circular Solutions has been quietly refining used lithium-ion batteries for years. The number making the rounds is 90 percent lithium recovery. It’s real. But the interesting part isn’t the number — it’s how they got there, and what the number does not yet mean.
Here’s the honest version, straight from Japan’s government innovation agency. That 90 percent figure was hit at the laboratory level, and the company is scheduled to begin validating it for mass production at Tsuruga beginning April 2027. So this is a proven bench result heading toward a scale-up trial, not a plant currently churning out lithium at 90 percent all day, every day. That distinction matters enormously, and I’ll explain why in a minute.
The clever bit is a reagent substitution
If you’ve never watched battery recycling up close, the short version goes like this. Spent cells get processed down into “black mass,” a gritty powder that concentrates the good stuff — lithium, nickel, cobalt. From there you dissolve the metals in a water-based chemical bath and pull them back out selectively, a route the industry calls hydrometallurgy.
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The catch with lithium is that it’s the diva of the group. Nickel and cobalt are relatively cooperative and command high enough value that recyclers have chased them for years; lithium tends to slip away into process streams and get lost. That’s why the government’s recovery targets under its Green Innovation Fund are lopsided: over 95% for both nickel and cobalt, but only at least 70 percent for lithium. Getting lithium is the hard homework.
JX’s trick is almost cheeky in its simplicity. Hydrometallurgy requires constant pH babysitting, and the usual reagent for that job is sodium hydroxide. The problem is that sodium is a contaminant you then have to fight to keep out of your final lithium. So instead of dosing in fresh sodium hydroxide, the team feeds lithium hydroxide derived from its own recovered lithium back into the bath. You adjust pH with the very element you’re trying to harvest, you stop poisoning your product with sodium, and the loop closes on itself. Purity climbs, and you’re buying less outside reagent. It’s the recycling equivalent of seasoning a stew with a ladle of the stew.
There’s a second, less-reported piece worth flagging for anyone who thinks all recycling starts with a furnace. The pretreatment method JX is developing skips the traditional roast entirely: cells are discharged, crushed under an inert atmosphere, then low-temperature vacuum-dried to actually reclaim the electrolyte before screening out clean black mass. No burning means lower energy input and one less way to degrade the material — a real engineering answer to the “batteries are just incinerated” assumption a lot of people still carry around.
Why “90% in the lab” deserves an asterisk
Scaling a hydromet process is where good numbers go to get humbled. EV packs are not uniform. An older nickel-manganese-cobalt cell and a lithium-iron-phosphate pack behave differently in the same bath, and a battery that’s been sitting in a wrecked car for two years is a different animal than a clean end-of-line reject from a factory. Chemistry, age, crash damage, and prior use all move the yield. Japan’s own agency is refreshingly blunt about this, noting that while overseas players advertise impressive recovery rates, in practice concerns persist about actual real-world recovery and material quality. Translation: everybody’s lab number looks great; the plant number is the one to trust.
This isn’t a startup with a press release, either. JX established its closed-loop process at bench scale at its Hitachi Works in 2020, then scaled it into Tsuruga piece by piece — a nickel sulfate line in 2021, cobalt sulfate in 2022, and a lithium carbonate recovery facility in April 2023. The battery arm was spun into a formal joint venture with Mitsubishi Corporation in July 2024. This is a decade-plus industrial slog, not an overnight breakthrough, which is exactly why the April 2027 scale-up date is the one to circle.
The actual bottleneck is a parking-lot problem, not a lab problem
Here’s the part the chemistry headlines bury. It doesn’t matter how efficiently you can strip a battery if the battery never shows up at your gate. The president of JX’s recycling venture said as much at an industry session, arguing that instead of endlessly debating which recycling technique wins, the priority should be building a national system for collecting batteries in the first place — the input side, in his words.
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That’s the crux for owners and the trade. Collecting dead EV packs is genuinely hard: they’re heavy, they hold dangerous residual voltage, and a damaged lithium cell is a fire risk in storage and transport. Plenty of retired EVs also get exported wholesale, taking their metals overseas with them. For a country that doesn’t mine any of its own nickel, cobalt, or lithium — and has historically leaned on China for refining — a leaky collection net is the whole ballgame. A world-class refinery starved of feedstock is just an expensive building.
What it means if you own or buy an EV
Practically, a maturing domestic recycling loop is quietly good news for EV economics. Recovered lithium, nickel, and cobalt that can go straight back into new cells put a floor under the residual value of the pack in your car — that battery is a bucket of recoverable minerals, not just a disposal liability. Over time, that scrap value is one of the things that helps stabilize battery costs and softens depreciation on used EVs.
There’s an insurance and repair wrinkle, too. As recyclers build capacity, a totaled EV’s pack becomes a genuine asset with a home to go to, which changes the salvage math on write-offs. And the fire-hazard handling that makes collection hard is the same reason your body shop can’t treat a cracked high-voltage pack like a fender — damaged packs demand specialized discharge, storage, and transport, and that’s a cost that flows through claims whether anyone advertises it or not.
The regulatory tailwind is real as well. Japan is explicitly building toward the stringent regulations, particularly in Europe, that increasingly mandate recovery rates and recycled content in new batteries. That’s the market force turning a lab curiosity into a supply-chain necessity.
So: is Japan about to corner the recycled-lithium market? Not this year. But the chemistry is sound, the company has the receipts, and the swap at the heart of it — using your own recovered lithium to make more lithium — is the kind of elegant, unglamorous engineering that actually survives contact with a factory floor. The number to watch isn’t 90 percent. It’s whatever comes out of Tsuruga after 2027, and how many dead batteries ever make it through the door.