Breakthrough achieved in the R&D of core materials for solid-state batteries, with ionic conductivity boosted to the commercial threshold.
2025-11-28
In October 2025, the research and development of core materials for solid-state batteries achieved a critical breakthrough: the ionic conductivity was boosted to the commercial threshold, removing the key barrier to the industrialization of all-solid-state batteries. A team from the Institute of Physics, Chinese Academy of Sciences, employed anion-modulation technology to introduce iodide ions into the electrolyte, forming a dynamically rich iodine-rich interfacial layer. This increased the contact area between the lithium-metal anode and the solid electrolyte by more than three times, reducing the interfacial impedance from 150 Ω·cm² to below 10 Ω·cm²—thus solving the industry-wide challenge of solid-solid interfacial contact failure. Meanwhile, a team from Ningbo Eastern University of Science and Technology innovatively developed an ultra-high-conductivity halide electrolyte. By designing a three-dimensional continuous tetrahedral transport pathway, they raised the room-temperature ionic conductivity to 12 mS/cm, approaching the level of liquid electrolytes.
Technological breakthroughs are driving upgrades to material systems. Sulfide electrolytes have achieved dual optimization of ionic conductivity and chemical stability through “high-entropy” design. The lithium superionic conductor developed by Tokyo Institute of Technology in Japan maintains high conductivity over a temperature range from -50°C to 55°C. Domestically, companies are making parallel advances: Ganfeng Lithium has built a pilot-scale production line for lithium sulfide with a capacity of 100 tons; Enjie Co., Ltd. has achieved ton-scale preparation of halide electrolytes; and Tianci Materials has pushed the yield of oxide electrolytes beyond 90%.
Industrial chain collaboration is accelerating, and equipment manufacturers such as Leading Intelligent have developed specialized equipment for dry electrode preparation. Nacornor’s roll-pressing machines achieve an accuracy of ±1 μm, enabling precise control of solid-state battery electrode thickness down to 0.1 mm. With breakthroughs in both material performance and manufacturing processes, the energy density of all-solid-state batteries has surpassed the critical threshold of 500 Wh/kg, offering highly safe and long-lasting solutions for applications such as new-energy vehicles and low-altitude aircraft.
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