我国科学家取得固态电池聚合物电解质研究新进展

Core Insights - A new type of fluorinated polyether electrolyte has been developed by a team led by Professor Zhang Qiang from Tsinghua University's Chemical Engineering Department, providing new ideas and technical support for the development of practical high-safety, high-energy-density solid-state lithium batteries [1][2] - Solid-state batteries are seen as a crucial development direction for the next generation of secondary lithium batteries, particularly those using lithium-rich manganese layered oxide as cathode materials, which show the potential to exceed 600 watt-hours per kilogram in energy density [1] Group 1 - Solid-state batteries face two main challenges: poor interfacial contact due to rigid contact between solid materials and the difficulty of electrolytes to coexist in extreme chemical environments with high-voltage cathodes and strong reducing anodes [1] - The team proposed a new strategy of "rich anion solvation structure" design, successfully developing a novel fluorinated polyether electrolyte that enhances physical contact and ionic conductivity at the solid-solid interface, significantly improving the high-voltage performance and interfacial stability of lithium batteries [1] Group 2 - A polymer soft-pack full battery constructed with this electrolyte achieved an energy density of 604 watt-hours per kilogram under an external pressure of 1 MPa, surpassing current commercial batteries [2] - The battery successfully passed safety tests, including puncture and exposure to a 120-degree Celsius heat box for 6 hours without any combustion or explosion, demonstrating excellent safety performance [2] - This research outcome is expected to provide important technical references for the development of mature solid-state battery products in the future [2]