This company claims a battery breakthrough. Now they need to prove it.

MIT Technology Review

by Casey Crownhart

February 26, 2026

AI-Generated Deep Dive Summary

A Finnish startup, Donut Lab, has claimed a groundbreaking advancement in solid-state battery technology, promising faster charging times, higher energy density, and lower costs compared to traditional lithium-ion batteries. The company’s announcement has sparked both excitement and skepticism within the industry. Solid-state batteries, which replace liquid electrolytes with solid materials, could revolutionize electric vehicles (EVs) by offering longer ranges and safer operation in extreme temperatures. Donut Lab claims its batteries can charge in just five minutes, last 100,000 cycles, and retain 99% of their capacity in harsh conditions—while being made from abundant, eco-friendly materials. The potential implications for the EV industry are immense. Solid-state batteries could significantly reduce charging times and increase range, making EVs more appealing to a broader audience. However, achieving large-scale production has proven challenging for even major players like Toyota and CATL, who have faced delays in commercializing similar technologies. Donut Lab’s bold claims have raised eyebrows, with experts like University of Chicago professor Shirley Meng expressing doubt over the lack of concrete demonstrations. The company’s approach to secrecy—minimal disclosure of technical details—has added to the mystery surrounding its innovation. While startups often guard their intellectual property during early stages, Donut Lab’s claims don’t align with known chemistries, further fueling skepticism. The race for solid-state batteries is heating up globally, with Chinese automakers like Changan planning trials and small-scale production as early as 2027. Despite the challenges, solid-state technology represents a critical step forward in sustainable energy storage. If Donut Lab’s claims hold up, it could transform the EV landscape, offering cleaner, more efficient power solutions at scale. For readers interested in AI, advancements in battery tech are crucial, as they underpin innovations in renewable energy systems and autonomous vehicles—both areas where AI is playing an increasingly important role. The story highlights the delicate balance

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Originally published on MIT Technology Review on 2/26/2026