Solid-State Batteries Reach Mass Production in Taiwan at 381 Wh/kg

TAIPEI — ProLogium Technology has begun mass production of an all-solid-state battery in Taiwan, moving a technology that has spent a decade as an industry promise onto a high-volume manufacturing line.

The company's Gen 3.5 Lithium Ceramic Battery is now in production at its Giga-level facility on the island, ProLogium said. A third-party test by TÜV found its 185.4 amp-hour large-format cell reached 381 watt-hours per kilogram and 903 watt-hours per liter.

Those figures matter for anything where weight and space are constrained. Most electric vehicles on the road today run on lithium-ion cells in the 250 to 300 Wh/kg range.

The cell also passed testing by UL Solutions under GB/T 43568-2026, China's methodology for all-solid-state batteries. After six hours under vacuum at 120 degrees Celsius, it recorded weight loss of less than 0.05% — a tenth of the standard's 0.5% threshold.

That certification is the detail worth pausing on.

A Taiwanese manufacturer has validated its flagship product against a Chinese national standard, and that standard has since been submitted to the International Electrotechnical Commission as a reference for global standardization. If the IEC adopts it, the definition of what counts as an all-solid-state battery worldwide will have been written in Beijing — and Taiwan's leading solid-state producer will already be compliant.

Standards-setting is the quieter half of technology competition. It attracts less attention than export controls or tariffs, and it shapes markets for longer.

The manufacturing milestone is arguably the bigger story than the energy density.

Solid-state batteries have repeatedly demonstrated impressive laboratory performance and then failed to survive the transition to volume production, where yield, consistency and cost decide commercial viability. ProLogium has been working on its Lithium Ceramic platform since 2012, began commercial production in 2013 and says it has shipped more than 2.4 million cells.

Its production lines have advanced in stages — sheet-by-sheet from 2013, roll-to-roll from 2017, and the third-generation Giga-level platform from 2024. The company's approach has been to carry equipment and process knowledge forward between generations rather than rebuilding at each step.

That strategy faces its real test with Gen 4, which switches to a fully inorganic superfluidized electrolyte while keeping the same Logithium cell architecture. ProLogium expects roughly 10% of its existing Giga-level line to require modification.

Gen 4 is also designed to include an active safety mechanism intended to prevent thermal runaway by stabilizing electrode materials at high temperature — the failure mode that has driven most battery recalls.

ProLogium is targeting electric vehicles, maritime systems, aerospace, unmanned systems and data centers, where power density has become a constraint as AI infrastructure demand continues to scale.

The company is also building capacity outside Taiwan, with France planned for scaled production and North America targeted for phased localization. Its model would produce battery inlays at volume in France or Taiwan, with downstream partners assembling cells, modules and packs nearer to customers.

For an economy where semiconductors and related equipment account for roughly 80% of exports, a second advanced-manufacturing platform reaching volume production has strategic value beyond the batteries themselves.