Core Viewpoint - Chinese scientists have made significant progress in the field of solid-state 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: Research Progress - A team led by Professor Zhang Qiang from Tsinghua University has developed a new strategy called "rich anion solvation structure" to address two major challenges in solid-state batteries: poor interfacial contact due to rigid solid-solid materials and the difficulty of electrolytes to coexist in extreme chemical environments under wide voltage windows [2]. - The team successfully created a new type of fluorinated polyether electrolyte using thermally initiated in-situ polymerization technology, which significantly enhances the physical contact and ionic conductivity at the solid-state interface, improving the high-voltage performance and interfacial stability of lithium batteries [2]. Group 2: Performance and Safety - The polymer battery assembled with this electrolyte demonstrated a series of excellent electrochemical properties, achieving an energy density of 604 Wh/kg under 1 MPa external pressure, which far exceeds current commercial batteries [2]. - The battery successfully passed safety tests, including needle penetration and exposure to a 120°C heat box for 6 hours without any combustion or explosion, showcasing its superior safety performance [2].

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]

Core Insights - Tsinghua University’s research team led by Professor Zhang Qiang has made significant advancements in polymer electrolytes for lithium batteries, providing new ideas and technical support for the development of practical high-safety, high-energy-density solid-state lithium batteries [1][3] Group 1: Challenges in Solid-State Batteries - Solid-state batteries currently face two main challenges: poor interfacial contact due to rigid contact between solid materials and the difficulty of electrolytes to coexist with high-voltage cathodes and highly reducing anodes in extreme chemical environments [3] Group 2: Innovative Solutions - The research team proposed a new strategy called "anionic solvent structure design," successfully developing a novel fluorinated polyether electrolyte that enhances physical contact and ionic conductivity at the solid-state interface, significantly improving high-voltage performance and interfacial stability of lithium batteries [3] Group 3: Performance Metrics - A polymer soft-pack full battery constructed with the new electrolyte achieved an energy density of 604 Wh/kg under 1 MPa external pressure, surpassing current commercial batteries [3] - The battery also passed safety tests, including puncture and exposure to a 120°C heat chamber for 6 hours, without any incidents of combustion or explosion, demonstrating excellent safety performance [3] Group 4: Future Implications - The research findings are expected to provide important technical references for the development of mature solid-state battery products in the future [3]