What the business is
Lithium isotope separation: an electrolyzer with a ceramic membrane that enriches lithium-6 to at least 99.995% for fusion fuel breeding.
The bet
Fusion plants will need tritium bred from lithium-6, the world has almost no lithium-6 separation capacity, and whoever purifies it owns the fuel supply of a $50B market.
How it started
Yohei Kiguchi, who founded energy-switching platform Enechange in Japan, had retired to Monaco when a visit to ITER changed his mind. He licensed Hirosaki University's separation technology and started Licube.
What happened
Kiguchi told TechCrunch a $50 billion market awaits by 2040 if fusion comes online, while conceding 'the future might be late by a few years' — so interim lithium purification for other industries keeps the company busy meanwhile.
What has to be true
Every fusion developer faces the same tritium shortage, so a supplier solving it once sells to the whole industry rather than betting on one reactor design.
Lithium-6 is 7.5% of natural lithium and today's separation capacity is minimal — an old bottleneck sitting in the critical path of a well-funded wave.
Interim markets in chips, pharma, fission and spacecraft mean revenue does not depend on fusion's schedule, which Kiguchi admits may slip.
Licensing proven university technology beats inventing isotope separation from scratch — the hard part was de-risking the chemistry, not the market.
What can be applied
Sell the picks and shovels for a technology wave, and keep an existing-market product alive until the big market actually shows up.
Aftermath
As of October 13, 2026, Licube was preparing to present at TechCrunch Disrupt in San Francisco. No funding, revenue or customer figures had been disclosed, and Kiguchi's own framing allowed that fusion 'might be late by a few years.'
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