Solid-state batteries have achieved a major breakthrough in China, solving long-standing challenges in energy storage technology. Researchers developed a self-adaptive interphase that keeps the lithium anode and solid electrolyte in close contact. Consequently, bulky external pressure is no longer needed.
The findings appeared in Nature Sustainability and could accelerate the practical use of next-generation batteries. Moreover, the project involved the Institute of Physics of the Chinese Academy of Sciences, Ningbo Institute of Materials Technology, and Huazhong University of Science and Technology.
Previously, solid-state batteries required constant pressure, making them heavy and impractical for devices or vehicles. In addition, tiny pores and cracks formed between the lithium electrode and sulfide electrolyte. These gaps shortened battery life and created potential safety risks.
To solve this problem, the team added iodide ions to the sulfide electrolyte. During battery operation, the ions migrate to the electrode interface and form an iodine-rich layer. This layer attracts lithium ions and fills gaps automatically, maintaining a stable, self-healing contact.
Prototype batteries using this method performed well even after hundreds of charge-discharge cycles. Furthermore, the technology could allow energy densities above 500 Wh/kg. This could double the lifespan of electronic devices.
Huang Xuejie, a corresponding author, said the technology could improve energy storage in humanoid robots, electric aviation, and electric vehicles. In addition, it provides higher efficiency and improved safety.
Wang Chunsheng, a solid-state battery expert at the University of Maryland, noted the breakthrough resolves a key commercialization bottleneck. Therefore, it is a major step toward practical solid-state batteries.
Industry analysts suggest the advance could boost China’s position in the global battery market. At the same time, it meets growing demand for safer, higher-capacity batteries in transportation and electronics.
Researchers now aim to optimize production and enhance battery performance and durability. Consequently, solid-state batteries are closer than ever to replacing conventional lithium-ion technology. This milestone demonstrates China’s leadership in energy research. It also paves the way for safer, high-density energy storage solutions worldwide.
