ProLogium Technology has reached a major milestone in the development of all-solid-state batteries, announcing that its Gen 3.5 Lithium Ceramic Battery (LCB) has entered mass production at its Giga-level manufacturing facility in Taiwan.
The Mercedes-Benz-backed battery company says the move takes its high-energy-density all-solid-state technology beyond laboratory and pilot-line development and into large-scale manufacturing.
Third-party testing has also highlighted the performance potential of the new battery. According to a TÜV test report, ProLogium’s 185.4 Ah large-format cell achieved 381 Wh/kg of gravimetric energy density and 903 Wh/L of volumetric energy density.
Those figures could have significant implications for electric vehicles and other applications where reducing battery weight and physical size is just as important as increasing range.
ProLogium’s Gen 3.5 Battery Reaches Mass Production
The transition to mass production is one of the most important challenges facing next-generation battery technologies. While numerous solid-state battery programs have demonstrated promising results in laboratories and pilot facilities, scaling those technologies into reliable, high-volume manufacturing remains difficult.
ProLogium is positioning its Gen 3.5 LCB differently.
The company says the battery is being produced using its Logithium cell architecture and established Lithium Ceramic Battery manufacturing platform, which has evolved through multiple generations since the technology was first defined in 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.
The company’s manufacturing strategy has been to gradually increase production capability rather than make a single jump from laboratory development to Giga-scale manufacturing.
That progression began with a Sheet-by-Sheet production line in 2013, followed by a more automated Roll-to-Roll manufacturing process in 2017. Its third-generation Giga-level manufacturing platform entered operation in 2024.
The company says each step has generated additional manufacturing, quality-control and process data that can be used to improve the next generation of battery production.
381 Wh/kg and 903 Wh/L Energy Density
The Gen 3.5 LCB’s reported energy density is one of its most notable characteristics.
A 381 Wh/kg gravimetric energy density means the battery can store more energy for a given weight than conventional lithium-ion cells with lower energy density. Meanwhile, the 903 Wh/L volumetric energy density indicates that more energy can be stored within a given physical volume.
For electric vehicles, improvements in both areas could help automakers pursue longer driving ranges without simply making battery packs larger and heavier.
Higher energy density can also benefit applications where weight is particularly important, including drones, unmanned systems, aerospace and potentially electric aircraft.
The cell is also designed for high-power operation and fast charging, two areas that remain critical as automakers work to make EV charging more convenient.
TÜV and UL Solutions Test the Solid-State Claims
Energy density is only part of the story. ProLogium’s latest announcement also focuses on independent testing related to the cell’s solid-state classification.
A separate test conducted by UL Solutions evaluated the cell using China’s GB/T 43568-2026 methodology.
After six hours under vacuum at 120 degrees Celsius, the cell recorded weight loss of less than 0.05%. The applicable threshold for all-solid-state classification is 0.5%.
Based on the test result, ProLogium says the Gen 3.5 cell qualifies as an all-solid-state battery under the standard.
GB/T 43568-2026 has also been submitted to the International Electrotechnical Commission as a reference for international standardization.
Independent testing and standardized definitions could become increasingly important as more battery companies introduce products described as solid-state or semi-solid-state.
The Logithium Architecture Is Designed for Multiple Generations
One of the key elements of ProLogium’s strategy is that its battery platform is not tied to a single chemistry.
The company’s Logithium architecture was developed in 2012 and combines a ceramic separator with a proprietary edge-frame structure. The design provides additional separation around the electrode perimeter to help isolate potential burrs while also supporting sealing and electrical insulation.
ProLogium has continued to evolve the electrolyte chemistry and active materials while maintaining the underlying architecture.
That approach is intended to make future battery upgrades easier to industrialize. Instead of replacing an entire manufacturing system whenever battery chemistry changes, the company can carry forward much of its existing equipment, processes and manufacturing knowledge.
This could be particularly important as battery manufacturers attempt to move promising laboratory technologies into commercial production without starting the industrialization process from scratch.
Gen 4 LCB Could Require Only Limited Factory Changes
ProLogium is already looking beyond Gen 3.5.
Its planned Gen 4 LCB will use a fully inorganic superfluidized electrolyte system while retaining the Logithium cell architecture and core manufacturing process.
According to ProLogium, only around 10% of its existing Giga-level production line and associated equipment would need to be modified to produce Gen 4 cells.
That could provide a significant manufacturing advantage if the company’s projections are achieved.
Gen 4 is designed to maintain the platform’s high energy density, high-power capability and fast-charging characteristics while introducing additional improvements.
One of the company’s key technologies is its Active Safety Mechanism (ASM), which is designed to stabilize electrode active materials under high-temperature conditions and help prevent thermal runaway.
ProLogium also expects Gen 4 to improve low-temperature performance while reducing material and manufacturing costs.
The company is targeting several markets for the technology, including electric vehicles, AI data centers, maritime applications and aerospace.
Automotive Experience Provides a Manufacturing Test Case
ProLogium’s battery platform has already moved beyond prototypes and into commercial applications.
The company says its LCB products are supplied to a major U.S. automotive audio-system company and are installed in vehicles from a Japanese automaker that ranks among the top three in North American sales.
According to ProLogium, the customer has placed more than 175 repeat orders, with cumulative deliveries exceeding 900,000 cells. The company also plans to expand the application from North America into the Asia-Pacific market.
The recurring orders are significant because they provide a longer-term test of manufacturing consistency, product quality and delivery reliability rather than relying solely on prototype demonstrations.
ProLogium has also entered the unmanned-systems market, where high energy density, high discharge capability and fast charging can provide meaningful advantages.
For drones and other unmanned platforms, reducing battery weight can increase payload capacity and endurance while faster charging can reduce downtime.
ProLogium Plans Global Battery Manufacturing
Taiwan will remain an important part of ProLogium’s manufacturing strategy, but the company is also planning a broader international production network.
The proposed structure would see Taiwan serve as the technology development and manufacturing-validation base, while France would support scaled production. North America would then progressively add localized supply and manufacturing capacity.
ProLogium is initially evaluating North American opportunities in areas such as unmanned systems, aerospace and AI data centers.
The company’s proposed approach involves producing Inlays, described as the core single-layer unit of its LCB cells, in France and shipping them to North America. Local partners could then assemble the Inlays into pouch cells using direct stacking before completing module and battery-pack integration closer to the end customer.
As demand increases, ProLogium could establish Inlay production in the United States as well.
A similar model could eventually be used in the Asia-Pacific region, with Taiwan supplying Inlays while regional partners handle downstream manufacturing.
What ProLogium’s Battery Milestone Means for EVs
Solid-state batteries have long been viewed as one of the most promising technologies for improving electric vehicle range, charging speed and battery efficiency.
The biggest challenge, however, has been manufacturing.
ProLogium’s Gen 3.5 announcement is notable because it focuses not only on cell performance but also on the ability to manufacture the technology at Giga-level scale. The company is attempting to demonstrate that a solid-state battery platform can evolve through successive generations without requiring a completely new production infrastructure every time the chemistry improves.
The reported 381 Wh/kg and 903 Wh/L figures are impressive on paper, but the larger question for the automotive industry will be how those performance levels translate into production vehicles, including real-world range, charging times, durability, cost and long-term reliability.
If ProLogium can successfully combine high energy density with scalable manufacturing and competitive costs, its Lithium Ceramic Battery platform could become an important contender in the next generation of EV batteries.
For now, the move of Gen 3.5 LCB into mass production represents a significant step in the industry’s broader effort to turn all-solid-state battery technology from a laboratory promise into a commercially viable product.
