ProLogium and Geely Push Solid-State Battery Mass Production Roadmap

ProLogium Technology confirmed on September 5, 2026, that its Gen 3.5 Lithium Ceramic Battery has entered mass production at its Giga-level plant in Taiwan. The 185.4 Ah cell now ships from an automotive-grade line, ending what had been a years-long pattern of solid-state announcements that stalled at pilot scale. The company has also detailed a Gen 4 design it says it can run on the same line with only about 10% of equipment modified, which would let a new chemistry reach volume production faster than rivals are building from scratch. The announcement places ProLogium among the very few battery companies that have actually crossed the line from lab-scale demonstration to industrial manufacturing, rather than publishing test results without matching production capability.

Industrial robotic arm performing precision manufacturing tasks in a high-tech factory

Third-Party Tests Put Numbers on the Cell

TÜV tested the 185.4 Ah large-format cell and recorded 381 Wh/kg gravimetric energy density and 903 Wh/L volumetric density, figures ProLogium says it designed around high power and fast charging rather than single-dimension energy density alone. The volumetric number matters as much as the weight number: conventional NMC cells typically sit around 700-800 Wh/L, so roughly 900 Wh/L points to a pack that stores more energy in the same tray space. That is the part of the specification automakers and OEMs are actually negotiating over.

UL Solutions applied China's GB/T 43568-2026 test method, which the company submitted to the International Electrotechnical Commission as a reference for international standardization. The cell spent six hours under vacuum at 120°C and lost less than 0.05% of its weight, far below the standard's 0.5% threshold for all-solid-state classification. That result is why ProLogium can apply the all-solid-state label under the new standard while its cells remain on a production line that has already shipped volume product. The GB/T test is specifically designed to distinguish true solid-state electrolytes from liquid electrolyte cells with minimal moisture, which is a distinction that has divided the industry as companies publish energy-density records without clarifying their chemistry.

A Track Record Before the Headline

This is not ProLogium's first commercial battery. The Gen 3.5 is built on the Logithium cell architecture the company defined in 2012, developed through four battery generations and three manufacturing generations, with commercial production running since 2013. The company says it has shipped more than 2.4 million cells across consumer, specialty, and automotive applications. Its production line has held IATF 16949 automotive quality certification since 2022 and passes annual surveillance audits.

The customer list, per the company, includes a U.S. automotive audio-system company and vehicles from a Japanese automaker that ranks in the top three for North American sales. Those programs have generated more than 175 repeat orders and cumulative deliveries of over 900,000 cells. Repeat orders from industrial and automotive buyers are a more reliable signal of readiness than a single laboratory test, and that is the point ProLogium is making with the Gen 3.5 launch: it is proving that mass production is a shipping operation, not a one-time headline. The company also plans a manufacturing network spanning Taiwan, France, and North America, signaling that it views this generation as the base for regionalized supply rather than single-source export.

Geely's 500 Wh/kg Target for 2027

On the other side of the table, Geely Holding is targeting a 500 Wh/kg solid-state cell by 2027, with pilot deployment across its brands — Geely, Zeekr, Lynk & Co, Volvo, Polestar, Lotus, and Smart — that year. Real-world validation on vehicles started in 2026, and the group says vehicles running the cells will reach a range comparable to diesel cars, above 1,000 km on a single charge, with a design life of up to 1 million km. In January, Geely committed to building its first in-house solid-state pack on an existing EV platform, and the 500 Wh/kg target is the step up from that program. Unlike earlier solid-state claims focused on lab records, Geely's validation has moved to road testing on real vehicles, a step that removes one of the most common objections to solid-state battery announcements.

Close-up view of advanced electronic components and energy storage systems

Sodium-Ion Moves From the Lab

The 2026 industry picture is broader than one cell. CATL plans mass-produced sodium-ion batteries this year and its first sodium-ion energy storage system deliveries in September, a move that puts a lower-cost chemistry into grid storage ahead of the solid-state wave. Sodium-ion batteries require less than 50 parts per million of water in dry rooms, roughly a quarter of what lithium-ion cells demand, adding approximately 8% to capital expenditure for upgraded dehumidification equipment. BYD, which released Blade Battery 2.0 — an LFP pack rated above 1,000 km of CLTC range — targets all-solid-state demonstrations in 2027, with limited batches that same year and mass production by 2030. Chery put its solid-liquid hybrid Rhino Battery into vehicles in the fourth quarter of 2026 and plans all-solid-state vehicle validation in 2027, after its chairman reported 400 Wh/kg cells at the 2026 World Power Battery Conference in Yibin.

The 2027 Window Is Crowded

When Geely, CATL, BYD, and SAIC all name 2027 for pilot or early deployment, the year stops meaning much by itself. Semi-solid batteries are already on Chinese roads today, and that is the realistic near-term baseline. Full solid-state at 500 Wh/kg is the harder target still sitting on pilot lines, and the cost, yield, and cycling data for a $30,000 car have not been published by any major manufacturer yet. What the September announcements do change is the evidence base: ProLogium's mass-production confirmation plus a third-party GB/T classification test gives the industry a measurable anchor, and the convergence on 2027 signals that the next generation of energy storage is being built to ship, not just to test. The real question now is not whether solid-state batteries can work, but whether the supply chain — from electrolyte material suppliers to cell assembly and packaging — can scale fast enough to support multi-brand vehicle programs on the timelines the automakers are promising. Those timelines are measured in years, not months, and the gap between a pilot line and a production line is where most battery breakthroughs have quietly died.