Mercedes-Backed ProLogium Begins Mass Production of Solid-State Batteries

Taiwanese battery manufacturer ProLogium has begun mass production of solid-state batteries with an energy density reportedly reaching 381 Wh/kg, marking another step toward commercialising a technology long viewed as a potential breakthrough for electric vehicles. The company is backed by investors including Mercedes-Benz and has been developing solid-state battery technology for automotive applications.

Solid-state batteries replace the liquid or gel electrolyte used in conventional lithium-ion batteries with a solid electrolyte. The technology could potentially offer higher energy density, improved safety and more compact battery packs, although manufacturing at large scale remains one of the industry’s biggest challenges.

ProLogium has been working with automotive companies to develop its technology, with Mercedes-Benz becoming an investor and taking a seat on ProLogium’s board. The partnership reflects growing interest from established automakers in solid-state batteries as they seek to improve electric-vehicle range and efficiency.

The company’s latest production milestone comes as several battery manufacturers and automakers compete to move solid-state technology from laboratories and pilot facilities toward commercial vehicles. ProLogium is also developing a major production facility in Dunkirk, France, which is expected to begin operations in 2027.

Despite the progress, solid-state batteries still face challenges involving manufacturing costs, production consistency, durability and large-scale deployment. ProLogium’s move into mass production therefore represents an important test of whether the technology can progress beyond limited production and eventually become a mainstream option for electric vehicles.