Dongguan Securities·2025-07-31 08:00Investment Rating - Overweight (Maintain) on new lithium battery materials, with expectations for accelerated industrialization [1] Core Viewpoints - Composite current collectors are a new type of material for lithium batteries, offering advantages in cost and performance compared to traditional copper and aluminum foils [4][18] - The transition from traditional copper foils to composite copper foils is expected to be the largest cost reduction segment in battery materials over the next 2-3 years [28] - The industrialization of composite current collectors is anticipated to accelerate, benefiting leading companies in the sector [66] Summary by Sections 1. Introduction to Composite Current Collectors - Composite current collectors differ from traditional materials by using a "metal-polymer substrate-metal" sandwich structure [15] - They are designed to reduce costs and improve safety, with composite copper foils reducing raw material costs by over 50% compared to traditional copper foils [19][23] 2. Advantages of Composite Current Collectors - Composite current collectors provide lower manufacturing costs, enhanced safety, lightweight properties, improved energy density, and extended cycle life [18][29][33] - The material's structure helps mitigate risks of thermal runaway in batteries, thus enhancing safety [29] 3. Application in Solid-State Batteries - The industrialization of solid-state batteries is accelerating, with composite current collectors being increasingly integrated into their applications [36][37] - Solid-state batteries have stringent requirements for current collectors, which composite materials can meet effectively [37] 4. Market Growth Potential - The market for composite current collectors is projected to grow significantly, with estimates suggesting a market size of 140 billion yuan by 2025 and over 700 billion yuan by 2030 [38] - The penetration rate of PET composite copper foils is expected to reach 25% by 2030, indicating strong demand [38] 5. Industry Chain Analysis - The industry chain includes upstream materials like PET and PP, core equipment for manufacturing, and downstream applications in various battery types [41][43] - The main manufacturing process for composite copper foils is the two-step method, which is currently the most mature and cost-effective [49][66] 6. Industrialization Acceleration - The production cost of composite copper foils is approaching that of traditional copper foils, with significant improvements in yield rates expected [66] - New national standards for battery safety are likely to create further opportunities for the adoption of composite current collectors in the market [67]