Mercedes-Backed ProLogium Initiates Mass Production of Advanced Solid-State Batteries




In a significant stride for the electric vehicle industry, ProLogium, a Taiwanese company with investment from Mercedes-Benz, has officially announced the commencement of mass production for its all-solid-state lithium-ceramic battery cells. This development signals a potential paradigm shift in battery technology, promising breakthroughs in driving range, charging speed, and overall safety for electric vehicles. The initial roll-out is taking place at their gigawatt-capable facility in Taoyuan, Taiwan, featuring their advanced Generation 3.5 large-format pouch cells.
The newly introduced Generation 3.5 Lithium Ceramic Battery (LCB) cell from ProLogium has undergone rigorous testing by Germany's TÜV. The results highlight an impressive gravimetric energy density of 381 watt-hours per kilogram and a volumetric energy density of 903 watt-hours per liter. These figures represent a considerable improvement, roughly 30% higher than the typical nickel-manganese-cobalt (NMC) cells commonly used in most electric cars in the United States, which generally achieve around 300 Wh/kg. For comparison, more economical lithium-iron-phosphate (LFP) cells, increasingly prevalent in EVs globally, offer a gravimetric energy density between 150 and 200 Wh/kg.
Another crucial aspect of ProLogium's innovation is the battery's safety and charging efficiency. The company asserts that its prior Generation 3 cell can achieve an 80% charge from a 5% state in a mere eight and a half minutes. Furthermore, these batteries exhibit remarkable resilience, withstanding bullet impacts and extreme temperatures up to 338°F (170°F), and remaining stable even when overcharged to twice their rated voltage, effectively mitigating fire risks. This robust performance was corroborated by UL Solutions, an independent safety science company, which tested ProLogium’s large-format cell according to China’s stringent GB/T 43568-2026 methodology. The tests confirmed minimal weight loss (less than 0.05%) under vacuum conditions at high temperatures, well below the 0.5% threshold for official all-solid-state battery labeling.
The initial manufacturing capacity at the Taoyuan facility is 0.5 gigawatt-hours, which translates to approximately 6,000 electric vehicle battery packs, each with an 80 kWh capacity. While this volume may appear modest compared to conventional lithium-ion battery plants, ProLogium has ambitious expansion strategies. The Taiwanese plant is slated to double its output by 2030, and a second, much larger production facility in Dunkirk, France, is in the works. The French factory is projected to commence operations in 2028, with an initial annual output of 4 GWh, eventually scaling up to a maximum of 44 GWh by 2030. Looking ahead, ProLogium is also preparing for the introduction of its Generation 4 battery cell, which will feature a fully inorganic superfluidized electrolyte system. This next-generation technology is expected to deliver even faster charging times and enhanced performance in cold conditions. A key advantage is that existing Gen 3.5 production lines will require only a 10% upgrade to produce Gen 4 cells, ensuring cost-effectiveness and a smooth transition to future advancements.