Summary of Conference Call on Solid-State Battery Industry Company and Industry Involved - **Company**: Toyota - **Industry**: Solid-State Battery Key Points and Arguments Strategic Adjustments - Toyota's strategy involves focusing on core technology at its Japan headquarters while concentrating on application market demands in China, aiming to leverage its technological advantages to collect patent fees and reduce costs through the Chinese supply chain [1][3] Financial Projections - For 2024, Toyota's profit is projected to be approximately 240 billion RMB, with the Chinese market accounting for about 19% of this, indicating significant growth potential [1][3] Solid-State Battery Industrialization - Toyota plans to initiate small-scale trial production of solid-state batteries in 2026, with mass production expected in 2027, initially targeting high-end Lexus models [1][5] Performance Metrics - Solid-state battery performance metrics include: - Hybrid vehicles: Charge/discharge rate of 15C-20C, cycle life of 10 years or 200,000 km - Electric vehicles: Energy density of approximately 350 Wh/kg, cycle life of about 1,500 cycles, and a capacity retention rate of about 80% at -30°C [1][7] Electrolyte Technology - Toyota focuses on sulfide electrolytes, while domestic companies explore various options including oxide, halide, and polymer electrolytes, with a trend towards composite usage [1][8] Production Techniques - Domestic companies primarily use a mixed solid-liquid method for production, which lags behind Japan in terms of cost and consistency. Toyota's method using petroleum by-products can reduce costs by 30%-40% [1][10] 3D Printing Technology - Toyota employs 3D printing to manufacture electrolyte layers below 200 nanometers, significantly reducing interface resistance to one-fifth of traditional solid-phase methods, although large-scale production remains a challenge [3][13][16] Market Feedback and Adoption - The feedback from the Chinese market will directly influence the speed of solid-state battery adoption. Current expectations suggest that market feedback may not be particularly favorable [1][6] Differences in Production Approaches - Key differences between domestic and Japanese companies in solid-state battery production include: - Material choices and production techniques - Japan's advanced control over pressure and porosity in production equipment [1][8][18] Future Material Choices - Toyota is inclined to combine sulfide solid electrolytes with lithium metal anodes, but currently uses silicon-carbon anodes to optimize performance while addressing expansion issues [1][19] Challenges in Large-Scale Production - The application of 3D printing technology in large-scale production faces challenges related to manufacturing costs, efficiency, and consistency [16] Environmental Control in Production - Strict control of oxygen and humidity is required in the production environment for solid-state batteries, with Japanese companies demonstrating superior precision in equipment [17] Current Trends in Battery Materials - Toyota is exploring various cathode materials, including high-nickel ternary and lithium-rich manganese-based materials, with potential applications in high-end electric vehicles [25] Overall Industry Outlook - The solid-state battery industry is characterized by diverse technological routes, with no single mainstream trend currently dominating [20] Other Important but Overlooked Content - The discussion highlighted the importance of balancing cost, efficiency, and performance in the development of solid-state batteries, as well as the need for ongoing research to address challenges related to material interactions and production techniques [1][19][24]

Group 1: Product Characteristics - The company's sulfide solid electrolyte membrane is not a skeleton membrane and does not require a skeleton support, consisting only of electrolyte and adhesive, achieving a tensile strength of 1.2 MPa [2] - The electrolyte powder types have varying ionic conductivities, with the highest reaching 16 mS/cm and the smallest particle size of 0.3 μm achieving 6 mS/cm, which is considered leading in the domestic market [5] Group 2: Production Processes - The electrolyte membrane production process includes dissolving the adhesive in a solvent, mixing it with electrolyte powder, and coating it onto a substrate to form a roll [3] - The core process for producing electrolyte powder involves solid-phase sintering, with key steps including mixing, sintering, and fine grinding [4] - The company employs a carbon thermal reduction method for lithium sulfide production, which is safe and suitable for large-scale production [6][7] Group 3: Quality and Application - The company can achieve lithium sulfide purity of 99.9% using carbon thermal reduction, while also providing samples of 99.5% purity, which meets electrolyte preparation needs [7] - Different ionic conductivities and particle sizes of the electrolyte powders do not correlate with production yield, as their performance is determined by the inherent properties of the components [5]

Group 1: Company Overview - The company is Yunnan Enjie New Materials Co., Ltd., with stock code 002812 and bond code 128095 [1][2]. Group 2: Solid-State Battery Material Layout - The company has established a production capacity for semi-solid battery separators through its subsidiary Jiangsu Sanhe Battery Material Technology Co., Ltd. [2]. - The company is actively expanding its market presence in the all-solid-state battery materials sector, focusing on high-purity lithium sulfide and sulfide solid electrolyte products [2]. - A pilot production line for high-purity lithium sulfide has begun mass shipments, and a 10-ton production line for solid electrolytes is under construction, with plans for a 1,000-ton production line in Yuxi [2]. Group 3: Intellectual Property and Patent Strategy - Since its establishment, the company has prioritized intellectual property, applying for a total of 50 patents, including 4 international applications, with 23 patents granted [3]. - The company holds patents related to its main products, including lithium sulfide and sulfide solid electrolytes, and is accelerating its international patent layout [3]. Group 4: Advantages of Sulfide Solid Electrolytes - Sulfide solid electrolytes offer high ionic conductivity, with some systems exceeding that of liquid electrolytes, and have a low interface resistance [4]. - The processing of sulfide solid electrolytes is efficient, with a short production process and mature preparation technology [4]. Group 5: Development of Supporting Membranes - The company is developing solid electrolyte supporting membranes, which have received small orders from customers [5]. - The new solid supporting membranes feature higher porosity and larger pore sizes to meet the filling requirements of solid electrolytes [5]. Group 6: Competitive Advantages in Lithium Sulfide Production - The company achieves high-speed, uniform mixing and continuous calcination without the need for liquid-phase solvents for secondary impurity purification [6]. - The cost advantages stem from the pricing of raw materials, and the company maintains excellent control over the particle size of its lithium sulfide products [6]. Group 7: Research on Halide Materials - The company is monitoring advanced technology directions, with halide-related research currently at the experimental preparation stage [7]. - Halides have a higher electrochemical window and better compatibility with high-voltage cathodes, although there are stability issues with the anode [7].