Investment Rating - The industry investment rating is "Positive" (maintained) [1] Core Viewpoints - The solid-state battery sector is expected to reach a critical milestone for vehicle installation validation by 2027, but it must overcome three core challenges: materials, processes, and interfaces. The sulfide system faces high costs and mass production difficulties, with long-term reliability yet to be verified. The national plan aims for an energy density of 500Wh/kg by 2030, with AI technology accelerating the breakthrough of industrialization bottlenecks [21][25] - The solid-state battery is transitioning from the laboratory stage to mass production validation, with small-scale vehicle testing expected by the end of 2025 and widespread testing anticipated between 2026 and 2027. Emerging application scenarios such as low-altitude, robotics, and AI are expected to open up market space for solid-state batteries, accelerating industrialization [23] Summary by Sections Industry Overview - The solid-state battery index decreased by 2.1% from September 15 to September 19, 2025, while the cumulative increase for 2025 is 48.5%. The average performance of solid-state battery-related stocks within the statistical scope was -2.2%, with all segments except aluminum-plastic film experiencing declines [4][10][11] Industry Dynamics - At the 2025 Suining International Lithium Battery Conference, experts indicated that solid-state batteries will face critical challenges in material, process, and interface technology by 2027. The sulfide system is particularly challenged by high costs and mass production difficulties [25] Company Developments - Ganfeng Lithium's subsidiary won the first prize at the "Maker China" low-altitude economy competition for its low-altitude aircraft power battery project, achieving an energy density of 320-550Wh/kg [26] - EVE Energy plans to break through solid-state battery production technology by 2026, aiming to launch a high-power, environmentally resistant, and safe solid-state battery [27] - XianDai Intelligent has achieved multiple breakthroughs in solid-state battery core processes and can provide complete solutions for sodium-ion battery manufacturing [28] - SK On has established a pilot factory for solid-state batteries, focusing on sulfide-based solid-state batteries and solid-state lithium metal batteries [30] - Panasonic aims to achieve sample shipments of solid-state batteries by 2026, accelerating the commercialization process [33]