高工锂电·2025-09-27 10:51Core Viewpoint - The article highlights the advancements in solid-state battery technology, particularly focusing on the doping modification of existing solid electrolytes to enhance overall performance, which is crucial for the commercialization of solid-state batteries [1][2]. Group 1: Sulfide Route - The introduction of iodine in sulfide solid electrolytes is becoming a significant direction, improving compatibility with lithium metal anodes and suppressing lithium dendrite growth [3][6]. - The ionic conductivity of iodine-doped sulfide electrolytes has reached 10 mS/cm, operating under pressures below 5 MPa, meeting key application demands [5]. - The supply chain risk is highlighted, as each GWh of solid-state battery requires approximately 90 tons of iodine, contrasting with the 10 tons needed for 1 GW of perovskite solar panels [6][7]. Group 2: Oxide Route - The technology iteration in oxide solid electrolytes is shifting from LATP (Lithium Aluminum Titanium Phosphate) to LLZO (Lithium Lanthanum Zirconium Oxide), with LLZO showing superior performance metrics [8][9]. - LATP is favored for its lower cost, while LLZO offers higher ionic conductivity, a larger electrochemical window, and better chemical stability [9][10]. - The supply chain considerations for LLZO are complex, as it relies heavily on rare earth materials, with China dominating the supply of lanthanum but being highly dependent on imports for zirconium [10][11]. Group 3: Mass Production Challenges - The mass production of LLZO faces significant challenges, particularly in achieving "sintering densification" due to lithium volatility during high-temperature processing [15][16]. - Innovative approaches like ultra-fast sintering (UFS) and pressure-assisted methods are being explored to enhance densification while minimizing lithium loss [17][18]. - Companies are also investigating cost-effective methods, such as direct wet coating of electrolyte slurries on electrodes, to streamline production processes [20]. Group 4: Industry Progress - Companies like Dingsheng Technology have established pilot production lines for sulfide solid electrolytes, indicating progress in scalable supply capabilities [4]. - Domestic firms are actively pursuing innovations to address the challenges of solid-state battery commercialization, paving the way for more robust industrial applications [21].