Few technologies command as much anticipation in the clean-energy arena as the solid-state battery, a device that could quietly rewrite the rules of energy storage.
Its conceptual leap lies in swapping the volatile liquid electrolyte of conventional lithium-ion cells for a solid medium, a substitution with cascading benefits.
In principle, this yields markedly greater energy density, appreciably faster charging and a dramatically diminished propensity to ignite, addressing three of the industry's most persistent anxieties at once.
Little wonder, then, that solid-state cells are routinely heralded as the decisive enabler for the next wave of electric vehicles and increasingly capable humanoid robots.
The abiding impediment, however, is industrialisation: fabricating these cells with consistent quality, at scale and at a palatable cost has confounded engineers for years.
Given the magnitude of the eventual prize, a fiercely competitive throng of legacy automakers and nimble start-ups is ploughing vast sums into surmounting those manufacturing hurdles.
Should any one of them crack durable, mass-producible solid-state technology, it stands to recalibrate the economics of mobility and robotics for decades to come.