Dongfeng Automobile officially started an important stage in the development of high-capacity solid-state batteries. The Chinese manufacturer sent a fleet of test vehicles equipped with new solid-state batteries with an energy density of 350Wh/kg to undergo extreme cold weather testing in Mohe, the northernmost region of China.
Citing Yipai Technology's announcement reported by Carnewschina, Thursday, January 15, the group of vehicles was dispatched from Wuhan to the Mohe Cold Region Test Base. At this location, the battery will undergo a series of strict winter calibration to verify the performance of solid-state technology in extreme temperatures.
The 350Wh/kg solid-state battery is said to be Dongfeng's latest achievement in next-generation battery research. From the company's official information, this battery is claimed to be able to support a vehicle's range of more than 1,000 kilometers in one charge.
Not only the mileage, the battery's ability is also claimed to be tough when faced with extreme conditions. Dongfeng said this battery has passed the hot box test at a temperature of 170 degrees Celsius and still maintains an energy retention rate of around 72 percent at a temperature of minus 30 degrees Celsius.
The test program at Mohe focuses on three core aspects, namely range at low temperatures, charging ability at low temperatures, and battery life in cold weather. More than 70 types of tests will be carried out at a temperature range of minus 40 degrees Celsius to minus 30 degrees Celsius.
The evaluation includes the stability of mileage, charging and discharging efficiency, battery structure safety, to the integration of batteries with the overall vehicle system. Dongfeng also stated that it had built an independent battery development platform that includes the complete process from research and development, trial production, to pilot testing.
The company claims to have completed more than 10 core technologies and filed more than 180 invention patents related to these technologies. The Dongfeng battery roadmap is said to not stop at 350Wh/kg. They are preparing a product lineup with energy densities ranging from 240Wh/kg to 500Wh/kg.
At the World Power Battery Conference 2025 which took place in Yibin, Sichuan, on November 12-15, Dongfeng also exhibited the latest generation of solid-state batteries along with a number of new energy vehicle models from their independent brands. On this occasion, Dongfeng revealed that it had built and operated a 0.2 GWh pilot production line of solid-state batteries.
The company targets mass production of 350Wh/kg solid-state batteries for vehicle installation needs starting in September 2026. Dongfeng also revealed that the battery supports a 1C charging rate, based on the presentation of the company's representative at the conference.
According to a report by the Chinese media Hubei Daily, the Dongfeng solid-state battery uses a high-capacity ternary cathode, a silicon-carbon anode, and a composite oxide-polymer solid-state electrolyte system. This configuration is claimed to be able to overcome the common weaknesses of conventional lithium batteries, especially related to safety and performance at low temperatures.
The thermal stability test up to 170 degrees Celsius is also said to exceed the requirements of China's national standard of 130 degrees Celsius, which confirms the superiority of the battery's safety. In addition, the development of solid-state batteries in China is also supported by a number of breakthroughs from various research institutions.
One of them comes from the Institute of Physics of the Chinese Academy of Sciences, which developed iodine ion additives to fill microscopic gaps in the material. The Metal Institute introduced a polymer framework to increase flexibility, while Tsinghua University developed a fluorinated polyether material that helps improve high-pressure resistance and strengthen the electrolyte.
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