ProLogium says it has started mass production of its Generation 3.5 all-solid-state battery cell in Taiwan, marking a significant step toward commercial use of higher-energy solid-state technology. The 185.4-Ah cell has been independently tested at 381 Wh/kg and 903 Wh/L, putting it above the energy density of many current EV battery cells.
Photo by: ProLogium
ProLogium Moves Solid-State Cells Into Production
The Taiwanese battery developer says its new Generation 3.5 Lithium Ceramic Battery is now being produced on the Taoke line at its Taoyuan facility.
That matters because many solid-state battery programs remain at the prototype, pilot-line or pre-commercial stage. ProLogium is presenting its latest cell as a product that has moved beyond laboratory validation and into repeatable manufacturing.
The company has also attracted investment from major automotive players, including Mercedes-Benz, which has helped give its solid-state program broader industry visibility.
The cell is a large-format 185.4-ampere-hour design intended to demonstrate that solid-state chemistry can be produced at sizes relevant to electric-vehicle applications.
Independent testing by TÜV measured gravimetric energy density at 381 watt-hours per kilogram and volumetric energy density at 903 watt-hours per liter.
Those figures are notably higher than the roughly 300 Wh/kg level associated with many mainstream nickel-manganese-cobalt cells. Lithium iron phosphate cells, increasingly used in lower-cost EVs, typically deliver around 150–200 Wh/kg.
Testing Examines the Solid-State Classification
ProLogium’s claim is not based only on energy-density figures.
UL Solutions also evaluated the cell under China’s GB/T 43568-2026 testing method, a standard designed to distinguish all-solid-state batteries from designs that still contain meaningful quantities of liquid electrolyte.
During the test, the battery cell was held under vacuum for six hours at 120°C, or 248°F.
The measured mass loss remained below 0.05%. That is well under the 0.5% threshold used by the method for classifying a cell as all-solid-state.
This distinction matters because the term solid-state battery has sometimes been applied broadly to batteries that still rely partly on liquid or gel-based materials.
ProLogium says its Generation 3.5 design uses a composite solid electrolyte together with a ceramic separator. It also incorporates a proprietary edge-frame structure intended to improve sealing, insulation and protection against manufacturing burrs.
Higher Energy Density Could Benefit EV Design
If ProLogium can maintain these performance levels at scale, the main benefit for electric vehicles would be greater energy storage without requiring proportionally larger or heavier battery packs.
A cell rated at 381 Wh/kg could allow automakers to pursue longer driving range, lower vehicle weight or a combination of both.
The 903 Wh/L volumetric figure is also relevant because battery packaging space is limited in passenger vehicles. Greater energy per liter could provide engineers with more flexibility when designing floor structures, cabins and crash-protection zones.
However, energy density alone does not determine whether a battery technology succeeds commercially. Manufacturing yield, durability, cycle life, cost, charging performance and consistency at high production volumes remain important factors.
For that reason, the transition from initial production to widespread vehicle deployment will depend on how the technology performs outside controlled testing.
Earlier Cells Show ProLogium’s Charging Goals
ProLogium has also published performance claims for its previous Generation 3 solid-state cell.
According to the company, that battery could charge from 5% to 80% in about 8.5 minutes.
ProLogium has also reported safety tests in which the earlier cell avoided fire under severe conditions, including ballistic penetration, exposure to 170°C, or 338°F, and overcharging at twice its rated voltage.
Those results are not specifications for the new Generation 3.5 cell, but they indicate the performance areas ProLogium is targeting as its technology develops.
The start of Generation 3.5 production is therefore best viewed as a manufacturing milestone rather than proof of broad EV readiness.
ProLogium has demonstrated that a large-format solid-state cell with independently measured high energy density can be produced on an operating manufacturing line. The next challenge is expanding that production while maintaining cost, quality, durability and safety at automotive scale.
Photo by: ProLogium
FAQ
Is ProLogium mass-producing solid-state batteries?
Yes. ProLogium says its Generation 3.5 Lithium Ceramic Battery cells are now being produced in Taoyuan, Taiwan. The cells are large-format units designed for potential automotive applications.
What is the energy density of ProLogium’s new battery?
TÜV testing measured the Generation 3.5 cell at 381 Wh/kg and 903 Wh/L. Those figures exceed the cell-level energy density of many conventional EV batteries.
How was ProLogium’s solid-state battery verified?
UL Solutions tested the cell using the GB/T 43568-2026 methodology. Its mass loss during the required vacuum and heat test was below 0.05%, compared with a 0.5% classification limit.
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