FAW Hongqi 500 Wh/kg Prototype Shifts Solid-State Focus to Legacy OEMs

China FAW Group announced on Tuesday that it has successfully tested a semi-solid-state battery with an energy density of 500 watt-hours per kilogram. The pack powers a prototype of the Hongqi Tiangong 06, a luxury SUV. This development marks a shift in the solid-state sector. While startups generate headlines with laboratory promises, a state-owned manufacturer has moved the technology into a road-legal vehicle.

The battery features a capacity of 142 kilowatt-hours. According to FAW, the vehicle achieves a range exceeding 1,000 kilometers under the China Light-Duty Vehicle Test Cycle (CLTC). That figure would likely translate to approximately 450 to 500 miles on the stricter U.S. EPA cycle. The cell chemistry utilizes a lithium-rich manganese base. This material choice differs from the high-nickel cathodes common in current premium electric vehicles. Manganese is abundant and inexpensive. Its use suggests a pathway to lower unit costs compared to current nickel-cobalt-aluminum chemistries.

The prototype uses a hybrid solid-liquid electrolyte. The industry defines this as “semi-solid-state” rather than all-solid-state. A small amount of liquid electrolyte remains to facilitate ion transport. This compromise allows manufacturers to use existing lithium-ion production lines with moderate retooling. It avoids the capital intensity of building entirely new factories for solid-ceramic or polymer-based cells.

The announcement contrasts with recent volatility in the battery startup sector. Donut Lab, a Helsinki-based firm, claimed at CES in January that it was ready for mass production of a 400 Wh/kg solid-state battery. Yang Hongxin, CEO of Svolt Energy, publicly dismissed those claims last week. Yang told local media that the performance parameters cited by the startup were contradictory and technically impossible. He stated that mass production of such density remains years away.

FAW provides a different level of validation. As a partner to Volkswagen and Toyota in China, the company operates with industrial rigor. The Hongqi prototype indicates that high-density cells have passed safety validation for vehicle integration. The company reported that the cells withstood thermal abuse tests at 200 degrees Celsius. This addresses a primary safety concern with high-energy chemistries.

Commercial availability remains the primary question. FAW did not provide a specific launch date for consumer sales. The company indicated that small-batch demonstration fleets would operate through 2026. Mass production is targeted for 2027. This timeline aligns with forecasts from S&P Global Mobility, which predict limited deployment of solid-state technology in premium vehicles before 2030.

Production challenges persist. Semi-solid batteries require precise control over the liquid injection process to ensure interface stability. The cost per kilowatt-hour for the 500 Wh/kg cells is currently unknown. NIO, a competitor in the premium segment, offers a 150 kWh semi-solid pack. The company has stated that the pack alone costs as much as an entire ET5 sedan. FAW must reduce this cost significantly to make the Tiangong 06 commercially viable.

The move puts pressure on Western automakers. Companies like BMW and Ford have invested heavily in solid-state partners such as Solid Power. None have yet shown a functioning vehicle with 500 Wh/kg density. The Hongqi prototype demonstrates that Chinese state-backed entities are converting research into hardware at a pace that established global competitors must now match.