Solid-state battery technology roadmap

　　Solid-state batteries currently have many technical systems, including sulfide, oxide, thin film and solid polymer. In the advancement of early solid-state battery technology, thin film and solid-state polymer technology are the main trends. In the past few years, companies such as Bosch and Dyson have continued to increase investment in these two solid-state battery technologies, but this Both companies are pursuing acquisitions to catch up in battery technology.

　　However, thin film and solid polymer technologies have two fatal problems: "high cost" and "low conductivity". For example, thin film technology cannot achieve high conductivity at room temperature (around 25°), so it needs to be continuously heated and maintained at room temperature. 60° can ensure efficient conductivity. Therefore, in many early solid-state battery trial production vehicles, the battery relied on constant heating, causing self-power loss. In fact, it itself was unable to exert other advantages.

　　Toyota has always focused on the development of sulfide solid-state battery technology, but sulfide itself is highly active. Once it comes into contact with water during production and use, hydrogen sulfide will be produced. Hydrogen sulfide is a flammable and hazardous chemical that can form an explosive mixture when mixed with air. It can cause combustion and explosion when exposed to open flames or high heat. Therefore, although the production cost of sulfide solid-state battery technology is lower than that of thin film technology, ensuring high enough safety from the manufacturing end to the application end is a higher threshold. In fact, it is also an increase from another perspective. Development costs.

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