China’s foremost electric vehicle (EV) battery expert, Ouyang Minggao, has cautioned against premature expectations for commercially viable solid-state batteries. Despite rapid development and aggressive patent filings by Chinese companies, widespread availability remains years away. According to Ouyang, vehicles testing these batteries in the near term are experimental and should not be marketed to consumers for at least two years.
Current EV Technology is Sufficient
Ouyang reassured the public that existing EV battery technology is already highly capable. While solid-state batteries hold immense promise, rushing their deployment risks compromising safety and performance. This message is critical because hype surrounding solid-state batteries has surged, with manufacturers across the auto industry—including traditional giants like FAW, Dongfeng, and even newcomers like Dreame—racing to showcase prototypes.
China’s Leading Role in Solid-State Development
China has emerged as a dominant force in solid-state battery research. In 2025, Chinese firms secured 44% of all newly published patents in the field, overtaking Japan. Crucially, production costs for key materials like sulfide solid-state electrolytes have plummeted from 20 million yuan per ton to under 1 million yuan, while capacity has increased substantially. Despite this progress, Ouyang stresses that real-world industrialization requires a phased approach.
Three-Stage Industrialization Roadmap
Ouyang outlined a clear timeline for the technology’s maturation:
- 2025-2027: Focus on graphite and low-silicon anode sulfide solid-state batteries with energy densities of 200-300Wh/kg, establishing a full supply chain.
- 2027-2030: Development of high-silicon anode batteries reaching 400Wh/kg and 800Wh/L, prioritizing high-capacity, stable silicon-carbon anodes.
- 2030-2035: Lithium anode sulfide batteries targeting 500Wh/kg and 1000Wh/L, requiring advanced anode and cathode materials.
Challenges Remain for Widespread Adoption
Higher energy density solid-state batteries face significant hurdles in quality control and stability. Ouyang predicts that when they finally reach mass production, energy densities will likely be in the 300-350Wh/kg range, with commercial viability expected within three to five years. This timeline underscores the need for realistic expectations, as the technology is still in the early stages of industrialization.
“Solid-state batteries represent a revolutionary technology with high barriers to entry and greater technical challenges. They require comprehensive solutions addressing key materials, interfaces, electrodes, and cells,” — Ouyang Minggao.
The race to commercialize solid-state batteries is heating up, but Ouyang Minggao’s expertise reminds us that true breakthroughs take time. While prototypes are exciting, consumer-ready technology is still several years away.
