Summary of Key Points from the Conference Call Industry Overview - The focus of the conference call is on the **halide solid-state electrolyte** technology, which is considered a breakthrough for the next generation of solid-state batteries [2][5]. Core Insights and Arguments - **Research Progress**: Significant advancements in halide solid-state electrolytes were highlighted at the Second China All-Solid-State Battery Innovation Development Summit held in February 2025. The research began in 2018, with breakthroughs in chloride and bromide halides showing sufficient ionic conductivity and stability, achieving 1 mS/cm at room temperature [2][5]. - **Technical Challenges**: The main challenges include humidity stability and the interface with the anode. Humidity sensitivity can reduce ionic conductivity, which can be improved through doping or coating. The anode interface is prone to reactions that lead to capacity decay, necessitating interface modification or composite electrolyte designs [2][6]. - **Commercial Viability**: Balancing performance and cost is crucial for commercial applications. Early halide materials relied on rare earth elements, making them expensive. However, since 2021, zirconium-based non-rare earth materials have emerged as a cost-effective alternative, despite initially lower ionic conductivity [2][7]. - **Recent Breakthroughs**: In 2023, a zirconium-based 4.75 chloride oxide solid-state electrolyte achieved a room temperature ionic conductivity of 2.42 mS/cm, with a cost of $11.6 per kilogram, laying a foundation for commercialization [2][8]. - **Patent Activity**: There has been a rapid increase in patent applications for halide solid-state electrolytes since 2016. Panasonic leads with 74 patents, while domestic companies like the Automotive Power Battery Research Institute and Honeycomb Energy follow with 17 and 13 patents, respectively. In the period from 2024 to March 2025, domestic manufacturers added 25 new patents, indicating accelerated development [2][9]. - **Automaker Innovations**: Domestic automakers, such as Geely, have made significant strides, obtaining 8 patents in 2024. Their self-developed oxychloride zirconium lithium solid-state electrolyte demonstrated good humidity stability, with minimal ionic conductivity loss [2][10]. - **Battery Manufacturer Developments**: Leading battery companies like CATL and BYD have made notable advancements. CATL introduced a doped sulfide solid-state electrolyte with an ionic conductivity of 1.15 mS/cm, while Honeycomb Energy developed a chloride-oxide composite lithium metal anode system with a conductivity of 7.5 mS/cm [2][11]. Additional Important Content - **Preparation Methods**: Various preparation methods for halide solid-state electrolytes include solid-phase synthesis, liquid-phase synthesis, and gas-phase synthesis, each with its own advantages and challenges [2][6]. - **Future Outlook**: The halide solid-state electrolyte technology is expected to play a crucial role in the future of solid-state batteries, with ongoing research aimed at overcoming existing technical challenges and enhancing commercial viability [2][12].