Mercedes-Benz is taking another major step toward the next generation of electric vehicles by deepening its partnership with Taiwanese battery specialist ProLogium. The agreement gives Mercedes-Benz priority access to ProLogium’s fourth-generation solid-state battery cells, allowing the German automaker to test technology that could significantly improve EV range, charging speed, safety and battery efficiency.
The partnership comes as the global automotive industry accelerates its development of solid-state batteries, widely regarded as one of the most important potential breakthroughs in electric vehicle technology.
Unlike conventional lithium-ion batteries, which use a liquid electrolyte, solid-state batteries replace it with a non-flammable solid material. The change has the potential to deliver higher energy density, faster charging, improved safety and longer battery life while potentially reducing some of the limitations associated with today’s EV battery technology.
Mercedes-Benz Gets Priority Access to ProLogium Gen4 Solid-State Cells
Mercedes-Benz and ProLogium have been working together for more than a decade, developing and evaluating advanced battery technologies for future electric vehicles.
Under the strengthened partnership, Mercedes-Benz will receive priority access to ProLogium’s fourth-generation lithium ceramic battery cells. The German automaker will conduct electrical, thermal and safety testing at its own facilities as well as through independent third-party testing institutes.
ProLogium’s Gen4 technology uses ceramic separator technology combined with a non-flammable inorganic electrolyte. According to the company, the architecture is designed to provide high power output while also supporting rapid charging.
For Mercedes-Benz, the agreement provides an opportunity to evaluate the technology under demanding automotive conditions before potential integration into future production EVs.
“At Mercedes-Benz, we are committed to shaping the future of electric mobility through technological leadership and innovation,” said Jörg Burzer, Member of the Board of Management of Mercedes-Benz Group AG.
“Our long-standing partnership with ProLogium is a strong example of how we bring the best expertise together to advance next-generation battery technologies. By combining ProLogium’s pioneering solid-state battery approach with Mercedes-Benz’s deep battery development, testing and integration capabilities, we are taking the next step in exploring advanced battery technologies for future electric vehicles.”
Why Solid-State Batteries Matter for Electric Cars
Battery technology remains one of the biggest areas of competition among automakers, and solid-state batteries could address several of the key limitations of current electric vehicles.
A higher energy density would allow automakers to store more energy without necessarily increasing battery-pack size or weight. For consumers, that could translate into longer driving ranges from similarly sized battery packs.
Fast charging is another major target. If solid-state cells can achieve consistently high charging speeds without compromising durability or safety, future EVs could spend considerably less time connected to a charger.
Safety is equally important. The non-flammable nature of the electrolyte used in ProLogium’s lithium ceramic technology could reduce some of the thermal risks associated with conventional battery systems.
The technology could therefore have an impact beyond simply increasing driving range. A successful solid-state battery could influence vehicle packaging, weight, charging infrastructure requirements and overall EV performance.
Mercedes-Benz Is Testing More Than One Solid-State Battery Technology
ProLogium is not Mercedes-Benz’s only partner in the race toward solid-state batteries.
The German manufacturer is also working with U.S.-based Factorial Energy, testing lithium-metal solid-state battery technology.
That partnership has already produced a striking real-world demonstration.
A Mercedes-Benz EQS fitted with a Factorial solid-state battery pack completed a test drive covering 748.8 miles, or 1,205 kilometers, on a single charge. Even more significant, Mercedes-Benz said the vehicle still had an estimated 85 miles, or 137 kilometers, of range remaining when the test ended.
That suggests a theoretical total range of more than 1,340 kilometers under the conditions of the test, although the result should not be interpreted as an official production-vehicle WLTP range figure.
Nevertheless, the test demonstrates why automakers are investing heavily in solid-state technology. Range figures approaching or exceeding 1,000 kilometers could fundamentally change how consumers perceive long-distance electric travel.
ProLogium Is Preparing for European Battery Production
ProLogium already operates a large battery manufacturing facility in Taiwan, but the company’s European expansion could become particularly important for Mercedes-Benz and other automakers on the continent.
The company is planning a battery manufacturing facility in Dunkirk, France, with a projected capacity of up to 44 GWh.
The French plant is intended to supply battery cells to customers across Europe, potentially giving ProLogium a strategically important manufacturing base close to major automotive markets.
For Mercedes-Benz, local European battery production could also simplify future supply chains if ProLogium’s technology progresses from testing to series production.
Mercedes-Benz Is Joining a Global Solid-State Battery Race
Mercedes-Benz is far from alone in pursuing solid-state batteries.
Major automakers including Toyota, Nissan, Honda, Volkswagen, Stellantis, BYD and Chery are also investing in or testing various forms of next-generation battery technology.
The approaches differ significantly. Some companies are focusing on lithium-metal architectures, while others are developing ceramic, sulfide or alternative solid electrolytes.
The industry is also moving from laboratory development toward vehicle-level testing, suggesting that solid-state batteries are gradually transitioning from a long-term research project into a potential production technology.
The biggest challenge remains scaling. A battery cell can perform impressively in laboratory or prototype testing, but producing millions of reliable cells at competitive cost is a much more difficult engineering and manufacturing problem.
The Next Big Step for Mercedes-Benz EVs
The strengthened ProLogium partnership does not mean that a production Mercedes-Benz EV with Gen4 solid-state batteries is ready to launch. The cells must still undergo extensive electrical, thermal, safety, durability and integration testing before any decision on mass production can be made.
However, Mercedes-Benz’s parallel work with ProLogium and Factorial Energy shows that the company is pursuing multiple solid-state battery solutions rather than relying on a single technology.
If these technologies successfully make the transition into high-volume production, the implications could be substantial. Longer range, significantly faster charging, lower battery weight and improved safety could make future Mercedes-Benz electric vehicles fundamentally different from today’s EQ models.
For now, ProLogium’s fourth-generation lithium ceramic cells represent another important step in that development process. And with Mercedes-Benz gaining priority access for testing, the partnership could provide an early look at what the next generation of long-range electric cars will be capable of.
Source: Mercedes-Benz