浙商证券：固态电池中试线加速落地 各材料环节全面升级

Group 1: Core Insights - Solid-state batteries are expected to become the ultimate technology route for power batteries, with intrinsic safety and high energy density [1] - The current focus is on sulfide solid electrolytes, with a breakthrough in electrolyte technology anticipated in 2027 and commercialization by 2030 [1] - Domestic policies are strongly supporting the development of solid-state batteries, with leading companies in batteries and new energy vehicles making comprehensive layouts [1] Group 2: Electrolyte Materials - Sulfide electrolytes are currently a hot topic, while composite electrolytes are viewed positively for the long term [2] - Inorganic electrolytes (sulfides, oxides, halides) offer high ionic conductivity and wide electrochemical windows, while polymer electrolytes provide good flexibility [2] - The current challenge for sulfide electrolytes is the cost reduction of lithium sulfide and optimization of binder in dry processing [2] Group 3: Anode and Cathode Materials - High-nickel ternary and silicon-carbon anodes are the mainstream choices in the short term, with lithium-rich manganese-based and lithium metal anodes to be explored in the long term [3] - High-nickel ternary technology is mature, and CVD silicon-carbon anodes offer performance and cost advantages [3] - Material modifications such as single crystalization, element doping, and surface coating will differentiate cathode manufacturers [3] Group 4: Current Collectors - Nickel-plated or nickel-based current collectors are resistant to corrosion, while porous structures alleviate expansion issues [4] - Traditional copper current collectors are prone to corrosion when in contact with sulfide electrolytes, leading to the adoption of nickel plating [4] - Porous copper foils are lightweight and flexible, making them suitable for silicon-carbon anodes [4] Group 5: Other Materials - Single-walled carbon nanotubes enhance the cycling, rate capability, and initial efficiency of silicon-carbon anodes, improving solid-state battery interface contact [5] - UV printing is gaining traction due to efficiency and performance, benefiting UV adhesives [5] - The skeleton membrane is undergoing iterative processes and may replace glue frame printing, significantly improving electrolyte membrane production efficiency [5]