Solid-state battery hits 381 Wh/kg as mass production begins at Taiwan factory

ProLogium Technology has started mass production of its Gen 3.5 Lithium Ceramic Battery in Taiwan, putting an all-solid-state battery design with high energy density into Giga-level manufacturing. A third-party test by TÜV found that ProLogium’s 185.4 Ah large-format cell reached 381 Wh/kg of gravimetric energy density and 903 Wh/L of volumetric energy density. In simple terms, the cell can store more energy for its weight and size, an advantage for electric vehicles and other applications where battery space is limited. The cell also passed a separate test by UL Solutions under China’s GB/T 43568-2026 methodology for all-solid-state batteries. After six hours under vacuum at 120 degrees Celsius, the cell recorded less than 0.05% weight loss, compared with the standard’s maximum threshold of 0.5%. That result allows the cell to be classified as all-solid-state under the Chinese standard. GB/T 43568-2026 has also been submitted to the International Electrotechnical Commission as a reference for international standardization. Battery numbers meet factory scale The bigger development is not just the cell’s performance figures but the manufacturing scale behind them. ProLogium says its Gen 3.5 battery is now in mass production at its Giga-level facility in Taiwan, moving the technology beyond laboratory and pilot-line production. The company’s Lithium Ceramic Battery platform has been developed since 2012. ProLogium began commercial production in 2013 and says it has since shipped more than 2.4 million cells for consumer, specialty and automotive applications. Its manufacturing process has also evolved in stages. A Sheet-by-Sheet production line began commercial operation in 2013, followed by a Roll-to-Roll line in 2017. The company’s third-generation Giga-level manufacturing platform entered operation in 2024. That progression is important because solid-state batteries have faced a difficult transition from promising laboratory cells to reliable, high-volume manufacturing. ProLogium’s approach is to carry manufacturing knowledge, equipment, and process improvements from one battery generation to the next instead of starting over at each stage. Same architecture, new chemistry At the center of the platform is ProLogium’s Logithium cell architecture. It uses a ceramic separator and an edge-frame structure that extends around the electrode perimeter to help isolate potential burrs while providing sealing and insulation. The architecture has remained in place as ProLogium has changed electrolyte chemistry and active materials. The company says this allows new battery generations to use much of the existing manufacturing foundation. That strategy will be tested further with Gen 4, which uses a fully inorganic superfluidized electrolyte while retaining the same Logithium architecture and manufacturing process. ProLogium expects only about 10% of its existing Giga-level production line and related equipment to require modification for Gen 4 production. Gen 4 is also designed to add an Active Safety Mechanism intended to prevent thermal runaway by stabilizing electrode active materials at high temperatures. The company is targeting applications including electric vehicles, maritime systems, aerospace, unmanned systems and data centers. ProLogium is also building a manufacturing strategy beyond Taiwan, with France planned for scaled production and North America targeted for phased localization. The company says the model could use battery inlays produced at scale in France or Taiwan before downstream partners assemble them into cells, modules and packs closer to customers.For now, the Gen 3.5 production milestone puts ProLogium’s solid-state battery technology on a manufacturing line rather than leaving it at the prototype stage.Get the latest in engineering, tech, space & science - delivered daily to your inbox.With over a decade-long career in journalism, Neetika Walter has worked with The Economic Times, ANI, and Hindustan Times, covering politics, business, technology, and the clean energy sector. Passionate about contemporary culture, books, poetry, and storytelling, she brings depth and insight to her writing. When she isn’t chasing stories, she’s likely lost in a book or enjoying the company of her dogs.