{"id":3857,"date":"2026-03-16T09:44:35","date_gmt":"2026-03-16T08:44:35","guid":{"rendered":"https:\/\/www.jauch.com\/blog\/?p=3857"},"modified":"2026-03-16T10:46:33","modified_gmt":"2026-03-16T09:46:33","slug":"solid%e2%80%91state-battery-test-review","status":"publish","type":"post","link":"https:\/\/www.jauch.com\/blog\/en\/solid%e2%80%91state-battery-test-review\/","title":{"rendered":"Solid State Hype Under Scrutiny \u2013 Jauch Evaluates the First Test Results of the Solid-State Battery"},"content":{"rendered":"\n

At the beginning of the year, the new Solid-State Battery from Donut Lab attracted worldwide attention at CES in Las Vegas. The company promised an energy density of 400 Wh\/kg, ultra\u2011fast charging, and 100,000 cycles \u2014 performance figures that exceed today\u2019s Lithium-Ion battery standards by a wide margin, prompting the industry to ask: Is this a technological breakthrough or an overhyped marketing claim?<\/p>\n\n\n\n

The combination of high energy density, low raw material requirements, and a wide operating temperature range, down to \u201330\u202f\u00b0C, certainly sounds impressive. Until now, however, these claims were based almost entirely on manufacturer information \u2014 independent testing had been missing. For the first time, external measurement data is now available:.<\/p>\n\n\n\n

Experts at VTT show that the cell delivers higher capacity at 80\u202f\u00b0C and 100\u202f\u00b0C compared to room temperature, but also loses its pouch vacuum after discharge at 100\u202f\u00b0C \u2014 an indication of mechanical changes that is critical for evaluating real\u2011world applicability.<\/p>\n\n\n\n

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As battery specialists, this is precisely where we want to take a closer look and place the Battery into technical context. That\u2019s why we asked our colleague S\u00f6nke Zacher, Battery Expert at Jauch, for his assessment:<\/p>\n\n\n\n

1. Practical Relevance of High-Temperature Test<\/h2>\n\n\n\n

“The measurements indicate an unusually strong performance under heat, suggesting low internal resistance and good ion conductivity. However, the decisive question is whether these characteristics remain stable over multiple cycles, during temperature fluctuations, and under mechanical stress \u2014 especially considering the documented pouch vacuum loss after the 100\u202f\u00b0C discharge.”<\/p>\n\n\n\n

2. Comparison with Lithium-Ion Batteries<\/h2>\n\n\n\n

“Stable performance at 80\u2013100\u202f\u00b0C would be exceptional for today\u2019s Lithium-Ion batteries, as they typically degrade significantly or become safety\u2011critical within this temperature range. Claims regarding the energy density, safety, and cycle stability of the new solid\u2011state cell, however, remain unverified \u2014 at present, they appear more ambitious than independently substantiated.”<\/p>\n\n\n\n

3. Our Test Plan at the Jauch Test and Certification Center<\/a><\/h2>\n\n\n\n

“To reliably assess real\u2011world applicability, we would conduct the following evaluations, among others:<\/p>\n\n\n\n