金属锂全固态电池因为其优异的安全性和潜在高的理论能量密度，被认为是最有希望的下一代储能装置。然而，低离子导率、低机械强度的厚固态电解质层严重限制了全固态电池的应用。降低固态电解质层厚度，实现电解质层薄膜化是提升全固态电池能量密度的有效策略，但实现电解质层薄膜化的同时，提升其机械强度与离子导率仍面临挑战，对高机械强度、高离子导率固态电解质薄膜的结构及其制备原尚理缺乏认识。. 本项目拟通过材料的结构设计、粘结剂的功能化修饰、策略性复配、浆料涂布制备硫化物固态电解质薄膜，同时结合高精度的飞行时间二次离子质谱、理论模拟、原位光学观测、原位阻抗等表征手段，探索高机械强度、高离子导率固态电解质薄膜的结构及其制备原理。从而指导金属锂全固态电池的设计，为获得高安全、长寿命及高能量密度的金属锂全固态电池奠定基础。

Lithium metal all-solid-state battery is considered as the most promising next generation energy storage device due to its excellent safety and potential high theoretical energy density. However, the application of all solid-state batteries is seriously limited by the thick solid-state electrolyte layer with low ionic conductivity and low mechanical strength. Reducing the thickness of solid electrolyte layer, realize the thin-film of solid electrolyte is an effective strategy to improve the energy density of all-solid-state battery. However, how to obtain solid electrolyte membranes while improving its mechanical strength and ionic conductivity is facing challenges. The understanding on the structure and preparation principle of solid electrolyte film with high mechanical strength and ionic conductivity still unclear.. In this project, the sulfide solid electrolyte membranes will be obtained through the structural design of materials, functional modification of binders, strategic compounding and slurry casting. At the same time, the structure design and preparation mechanism of high mechanical strength and high ionic conductivity solid electrolyte membrane will be employed by combining high-precision time-of-flight secondary ion mass spectrometry, theoretical simulation, in-situ optical observation, in-situ impedance and other characterization means. Thus, give a guidance to design all-solid-state battery and lay a foundation for obtaining lithium metal all-solid-state battery with high safety, long life, and high energy density.