ProLogium and Rimac Show Solid-State Pack: 4-6 Minute Charging

A battery pack concept shown at the 2026 Paris Motor Show charges from 5% to 80% in roughly 4 to 6 minutes. ProLogium and Rimac Technology built the mockup around a "superfluidized" all-inorganic solid electrolyte, a 100% ceramic separator and an all-silicon anode — and they have already set the next milestone: functional battery segments at CES 2027 in Las Vegas.

The timeline is firm in outline. After CES, the partners will test thermal management, then cell integration. Initial vehicle and public-road testing is planned for the second half of 2028. All of it targets the battery electric vehicle market.

Where did the partnership come from?

The two companies signed a Memorandum of Understanding in September 2025 to develop a next-generation battery platform. The collaboration combines ProLogium's cell technology with Rimac's battery system development expertise, focusing on a pouch cell-to-pack architecture.

"What we are presenting at the Paris Motor Show is the baseline of that collaboration with Rimac Technology announced at IAA in 2025," said Vincent Yang, Founder and CEO of ProLogium. "Building on the completed concept mockup and the functional segments currently in development, we are preparing to move into the development and production of a functional battery, progressing toward a full-scale battery pack and subsequent vehicle integration validation."

Daniel Kišić, Principal Product Architect of Rimac Technology, said the company is "developing a scalable cell-to-pack integration technology for solid-state pouch cells, designed to meet and exceed the requirements the automotive industry is expected to set over the coming decade." His team is evaluating integration solutions in parallel on functional battery segments, covering thermal management, swelling management, cell integration and system-level design — some oriented toward maximum energy density, others toward performance.

What's inside the electrolyte?

The companies call their material "SF-Ceramion Superfluidized Inorganic Solid-State Electrolyte." It combines the high ion concentration of solid materials with the interfacial contact properties of liquids. According to the partners, it overcomes three bottlenecks of traditional solid-state batteries: ionic conductivity, interfacial stability and manufacturing efficiency.

The measured numbers, per ProLogium:

• Ionic conductivity: 57 mS/cm at room temperature (25°C), roughly 5X to 6X higher than conventional liquid- and sulfide-based solid electrolytes.
• Low temperature: 12.82 mS/cm at −20°C with 90% to 95% discharge efficiency. Even at extreme cold, it outperforms the room-temperature conductivity of sulfide solid-state electrolytes and liquid electrolytes, holding >90% discharge efficiency.
• Energy density: 860 to 940 Wh/l volumetric; the composite silicon anode delivers 360 to 400 Wh/kg.
• Charging: 5% to 80% in roughly 4 to 6 minutes.
• Modules: operates without external pressurized clamping modules.

How does the silicon anode perform?

The 100% composite silicon anode reaches an activation utilization of 1,800 to 2,300 mAh/g — nearly 6X that of conventional graphite anodes — while requiring only one-fifth of its thickness. ProLogium says unit energy cost drops to around two-thirds that of graphite, measured in USD/kWh.

What about safety?

The all-ceramic separator, made from non-flammable inorganic oxides, maintains structural integrity at decomposition temperatures above 1,000°C and retains electrical insulation at 300°C. It resists internal stresses from electrode swelling during charge-discharge cycles and withstands external physical impacts.

An Active Safety Mechanism kicks in under extreme heat or high voltage: the electrolyte decomposes into ASM components that stabilize the cathode and transition the anode to a ground state, stopping thermal runaway. The electrolyte is intrinsically non-flammable and, the companies say, generates no combustible or toxic gases even under high-temperature, high-voltage conditions. They contrast this with sulfide-based solid-state electrolytes, which release flammable sulfur vapors in high-temperature oxidative environments.

Structural support comes from Logithium, an inner electrode layer structure using a silicone-based frame adhesive applied via wet film coating. It doubles as an extra separator, adds moisture resistance and guards against structural collapse and edge short circuits. A derived Bi-cell double-side thick-film technology increases active-material coating thickness, letting two single cells combine — fewer stacking layers, less weight, higher capacity.

Can it get cheaper than lithium-ion?

ProLogium claims its Gen 4 lithium ceramic battery can reach cost parity with conventional nickel-cobalt-manganese lithium-ion batteries at scale. The superfluidized inorganic electrolyte contains no rare metals or unstable precursors, allowing industrial-grade raw materials at 98.5% purity instead of battery-grade 99.99% purity.

At pack level, the safety profile could simplify cooling systems, and higher cell energy density means fewer cells and components per energy target. ProLogium estimates a 5% to 10% pack cost reduction versus conventional lithium-ion systems. The Gen 4 anode-less design, using pattern coating on ultra-thin lithium metal foils, pushes density to 430 to 470 Wh/kg and 1,000 to 1,100 Wh/l with roll-to-roll manufacturing at costs the company says are comparable to graphite anodes.

The roadmap now hinges on converting a Paris mockup into road-tested hardware before the end of 2028.