我国科学家在固态电池聚合物电解质领域取得重要研究进展

Core Insights - The rapid development of electric vehicles, electric aircraft, and humanoid robots has created a pressing demand for battery devices that combine high energy density and excellent safety performance [1][2] - A research team led by Professor Zhang Qiang from Tsinghua University has made significant progress in the field of lithium battery polymer electrolytes, providing new ideas and technical support for the development of practical high-safety, high-energy-density solid-state lithium batteries [1][2] Group 1: Solid-State Battery Development - Solid-state batteries are widely regarded as an important development direction for the next generation of secondary lithium batteries, particularly those using lithium-rich manganese-based layered oxides as cathode materials, which show the potential to exceed an energy density of 600Wh/kg [2] - Current challenges in solid-state battery applications include poor interface contact due to rigid solid-solid material interactions and the difficulty of electrolytes to coexist with high-voltage cathodes and highly reducing anodes in extreme chemical environments [2][3] Group 2: New Electrolyte Strategy - The research team proposed a new strategy called "rich anion solvation structure" and successfully developed a novel fluorinated polyether electrolyte, which enhances the physical contact and ionic conductivity of the solid-state interface, significantly improving the high-voltage performance and interface stability of lithium batteries [2][3] Group 3: Performance and Safety Testing - The polymer battery assembled with the new electrolyte demonstrated a series of excellent electrochemical properties, achieving an energy density of 604Wh/kg under 1MPa external pressure, surpassing current commercial batteries [3] - The battery successfully passed safety tests, including puncture and thermal stability tests at 120 degrees Celsius for 6 hours, without any incidents of combustion or explosion, showcasing outstanding safety performance [3]