DT新材料·2025-06-05 16:13Core Viewpoint - Sulfide solid electrolytes are emerging as a promising material for all-solid-state batteries due to their high ionic conductivity, good flexibility, and excellent machinability [1] Production Challenges - The production of lithium sulfide, a key raw material for sulfide solid electrolytes, faces challenges such as complex synthesis processes requiring high temperatures and inert gas protection, leading to increased processing costs [2] - Chemical side reactions between solid electrolytes and battery electrodes may affect the stability of the battery interface [2] Industry Developments - Companies are actively investing in the production of lithium sulfide to meet market demand. For instance, Idemitsu Kosan plans to achieve an annual production of 1,000 tons of lithium sulfide by 2027-2028 [3] - In China, several companies, including Ganfeng Lithium, have made significant progress in this field [3] Company Summaries - Ganfeng Lithium: Achieved mass production capability of battery-grade lithium sulfide in 2022 and plans to expand production lines in 2024. Their lithium sulfide products have a purity of 99.9% and D50 ≤ 5μm, meeting the technical requirements for high-conductivity solid electrolyte materials [4] - Enjie Co., Ltd.: Since 2021, has been collaborating with Central South University to develop low-cost, high-purity lithium sulfide products. They have established a ton-level pilot line and completed debugging of a hundred-ton intermediate production line [5] - Tianqi Lithium: Announced completion of industrialization preparations for lithium sulfide by May 2025, with significant improvements in uniformity and activity of their new battery-grade lithium sulfide micro-powder [6] - Sichuan Wanbang New Energy: Established in 2019, has production capabilities for lithium sulfide and plans to build a demonstration line with an annual capacity of 200 tons of high-purity lithium sulfide [7] - Tianhua New Energy: Engaged in research and development of sulfide solid electrolytes and low-cost ultra-pure lithium sulfide, with ongoing testing of their products [8] - Guanghua Technology: Plans to expand its lithium sulfide production capacity from 300 tons/year to 3,000 tons/year based on market demand [9] - Xiamen Tungsten: Developing new synthesis processes for lithium sulfide, showing promising results in pilot tests [10] - Yanyi New Materials: Launched lithium sulfide products in August 2024, gaining recognition from leading domestic companies and research teams [11] - Taihe Technology: Currently in the small-scale testing phase for lithium sulfide synthesis technology [12]