中国科大破解全固态锂电池应用压力难题

Core Viewpoint - A new low-cost solid electrolyte, lithium zirconium aluminum chloride oxide, has been developed to address the challenges of solid-state lithium batteries, enabling their commercial viability and reducing the pressure requirements for stable cycling [1][2] Group 1: Technical Challenges and Solutions - Solid-state lithium batteries face difficulties in maintaining interface contact due to the need for high external pressure, which is not feasible in practical applications [1] - The key to solving this issue lies in finding a solid electrolyte that can effectively change shape under low pressure while maintaining high ionic conductivity and being suitable for large-scale production [1] Group 2: New Material Development - The newly developed lithium zirconium aluminum chloride oxide has a Young's modulus of less than 25% and hardness of less than 10% compared to other mainstream inorganic solid electrolytes, offering superior deformability [1] - This material maintains its inorganic powder form, making it compatible with large-scale roll-to-roll production without the risk of excessive extension during high-pressure processes [1] Group 3: Performance and Commercial Viability - The ionic conductivity of lithium zirconium aluminum chloride oxide allows the pressure required for stable cycling of solid-state lithium batteries to be reduced from tens or hundreds of megapascals to a practical 5 megapascals, enabling hundreds of stable cycles at this pressure [2] - The core raw material, zirconium tetrachloride, is economically viable, costing less than 5% of mainstream sulfide solid electrolytes, indicating strong commercial prospects [2]