ProLogium Technology Co., Ltd. announced that it has moved from pilot‑line validation to full‑scale mass production of its latest all‑solid‑state lithium‑metal battery, delivering an energy density of 381 Wh/kg and 903 Wh/L—the highest reported for a commercially‑available solid‑state cell to date【ProLogium】. The company says the new format uses a sulfide‑based solid electrolyte paired with a lithium‑metal anode, and the cells are manufactured on a 30 Ah production line capable of delivering 10 GWh per year by the end of 2027.

The breakthrough stems from a three‑year R&D program that refined the interface between the lithium metal and the argyrodite‑type sulfide electrolyte, reducing interfacial resistance to under 10 mΩ·cm² and eliminating dendrite formation at current densities up to 5 mA cm⁻². In addition, ProLogium introduced a dry‑electrode coating process that eliminates the need for solvent‑based slurry casting, cutting manufacturing energy use by roughly 30 % and improving throughput.

Why the numbers matter: conventional lithium‑ion cells typically top out at 260–280 Wh/kg, while most solid‑state prototypes reported in 2024–2025 hovered around 300 Wh/kg. Crossing the 380 Wh/kg threshold narrows the performance gap with gasoline‑powered drivetrains, making solid‑state batteries viable for long‑range electric vehicles without sacrificing weight or volume. The volumetric density of 903 Wh/L also opens doors for compact applications such as drones, e‑bikes, and portable power packs where space is at a premium.

Industry analysts see ProLogium’s scale‑up as a pivotal moment for the solid‑state market. “Achieving mass‑production metrics at these energy levels demonstrates that the technology is moving out of the lab and into the supply chain,” notes Dr. Elena Martínez, senior analyst at BloombergNEF【https://www.bloomberg.com/news/articles/2026-09-20/solid-state-battery-mass-production】. The company has already secured supply agreements with two major EV manufacturers for a 2028 launch of a 600‑km range sedan, and it plans to expand the cell format to 50 Ah modules for commercial vehicle applications.

The announcement also puts pressure on rivals such as QuantumScape and Solid Power, which have been targeting 350 Wh/kg in pilot production. If ProLogium can maintain yield rates above 95 % and keep costs under $120 kWh⁻¹, the economics could tip the balance in favor of sulfide‑based solid electrolytes over oxide or polymer alternatives.

In summary, ProLogium’s transition to high‑energy‑density solid‑state battery mass production marks a concrete step toward commercial viability, offering a compelling combination of safety, performance, and manufacturability that could accelerate the adoption of solid‑state technology across the automotive and portable‑power sectors.