【Telegram Interpretation】Leading enterprise's sulfide solid-state battery is expected to achieve small-batch production next year. Sulfide is the most feasible pathway to realize all-solid-state batteries currently. This company plans to jointly invest in constructing a sulfide solid-state electrolyte production line with annual capacity of hundreds of tons.

【Telegram Original Text】

【BYD Sulfide Solid-State Battery Expected to Achieve Small-Scale Production by 2027】Cailian Press, February 9 — According to Cailian Press reporters from BYD’s Investor Relations Department, BYD is exploring multiple approaches in the solid-state battery field, with sulfide solid-state batteries as a key technological direction. Breakthroughs have been made in battery lifespan and fast charging, and small-scale production is expected to begin by 2027. In the sodium battery sector, the development of the third-generation product platform is underway, and sodium batteries capable of ten-thousand-cycle life have been developed. The mass production timeline will depend on actual market and customer demand. (Reporter Xu Hao)

【Summary of Analysis】

Leading company sulfide solid-state batteries are expected to achieve small-scale production next year. Sulfide is currently the most feasible path toward fully solid-state batteries. This company plans to jointly invest in a production line with an annual capacity of hundreds of tons of sulfide solid electrolytes, while another company has already supplied semi-solid battery production lines to top lithium battery manufacturers.

【Telegram Analysis】

1. Sulfide is the most feasible path among the three current technological routes to achieve fully solid-state batteries

Emerging fields such as low-altitude economy, humanoid robots, and energy storage stations demand batteries with high energy density above 400Wh/kg and high safety. Replacing liquid electrolytes with solid electrolytes fundamentally enhances safety, with energy density potential exceeding 500Wh/kg. The core of solid-state batteries is the solidification of the electrolyte, which offers advantages in energy density and safety. There are three main technical routes in the solid-state battery field: polymer solid-state batteries, oxide solid-state batteries, and sulfide solid-state batteries. The primary difference lies in the type of solid electrolyte used. Among these, sulfide solid electrolytes have conductivities comparable to liquid electrolytes, making them the most feasible path toward fully solid-state batteries.

Additionally, solid-state batteries are suitable for commercial aerospace applications. Unlike ground applications, satellites operate in vacuum, under intense radiation, and extreme temperature variations. Once a failure occurs, it can lead to mission failure, and in-orbit repairs or replacements are impossible. This amplifies the shortcomings of traditional liquid lithium-ion batteries, such as electrolyte volatilization, thermal runaway risks, and uncertain lifespan. From first principles, satellite power systems prioritize long-term stability, safety, and energy density.

A research report from Bank of China Securities notes that solid-state batteries, with no liquid electrolyte, low gas evolution risk, and radiation and temperature tolerance, are highly compatible with satellite applications. Industry practice shows that solid-state batteries have moved from laboratory validation to engineering and in-orbit testing stages. As industrialization progresses, the penetration of solid-state batteries in aerospace is expected to increase.

2. Related listed companies: Fosusi Technology, Huazhi Technology

Fosusi Technology: The company plans to jointly establish a project company with Zijin Mining’s subsidiary Zijin Lithium Yuan, Xiamen Zijin, and Guangxin Research Institute to invest in a pilot platform for battery-grade sulfide lithium. The project company’s registered capital is 100 million yuan, with Fosusi contributing 5 million yuan, holding a 5% stake. The total planned investment is 113 million yuan to build a 100-ton-per-year sulfide lithium production line, mainly for R&D, production, and operation of high-purity battery-grade sulfide lithium products. This investment constitutes an associated transaction and will not significantly impact the company’s future financial condition or operating results.

Huazhi Technology: The company has already supplied semi-solid battery production lines to top lithium battery manufacturers and will actively follow up on solid-state battery equipment-related business.