Donut Lab Survives 100º C Test. Is That Good Enough? - CleanTechnica

The article discusses the ongoing controversy surrounding Donut Lab’s solid-state battery technology, which claims significant advancements such as an energy density of 400 Wh/kg—nearly double that of typical lithium-ion cells—a five-minute charge time, an operating temperature range from -30º C to 100º C, a 100,000 cycle lifespan, and the use of zero rare earth materials. To address skepticism, Donut Lab has published independent validation data from VTT, the Finnish state research institute, which conducted a series of tests on the battery’s performance, particularly at elevated temperatures of 80º C and 100º C. These tests involved applying mechanical pressure to the cell, charging and discharging it under controlled conditions, and measuring capacity retention and stability. Despite the promising data showing the battery performing better at higher temperatures than at room temperature, doubts remain in the industry. The article highlights that while Donut Lab’s new test results demonstrate the battery’s ability to operate under extreme heat and maintain