【3D Process Flow】Summary Post--Synthesis of Oxide, Sulfide, and Polymer Solid-State Battery Electrolytes

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【3D Process Flow】Summary Post – Useful for understanding the process flow: https://bbs.hcbbs.com/thread-5711616-1-1.html ---------------------------------------------------------- The synthesis process of solid-state battery electrolytes is a key technical aspect in the industrialization of solid-state batteries; it mainly involves three categories: oxides, sulfides, and polymers. The mainstream manufacturing process for oxide electrolytes (such as LLZO) is the solid-state reaction method: raw materials such as Li₂CO₃, La₂O₃, and ZrO₂ are ground and mixed in a stoichiometric ratio, and then sintered at high temperatures of 900–1200°C to form a dense garnet structure, with key control being the intergranular impedance. Sulfide electrolytes (such as Li₆PS₅Cl) are prepared using a two-step process of mechanical ball milling followed by heat treatment: high-energy ball milling is used to amorphize raw materials such as Li₂S and P₂S₅, after which heat treatment at 300–500°C is carried out to form a cristobalite crystal structure; the entire process must be conducted in an argon glove box. Polymer electrolytes are formed by dissolving lithium salts (such as LiTFSI) in a PEO matrix via solution casting. The core of the synthesis process lies in achieving high ionic conductivity (>10⁻³ S/cm), low interfacial resistance, and good electrochemical stability.