ALL-SOLID-STATE SECONDARY BATTERY

摘要

[Problem] To provide an all-solid-state secondary battery which exhibits superior solid electrolyte dispersibility, inhibits the degradation of the solid electrolyte, and exhibits excellent battery output characteristics and high temperature cycle characteristics, even when sulfide glass is used as the solid electrolyte. [Solution] The all-solid-state secondary battery of the present invention has: a positive electrode having a positive electrode active material layer; a negative electrode having a negative electrode active material layer; and a solid electrolyte layer between the positive electrode active material layer and the negative electrode active material layer. The all-solid-state secondary battery is characterised by: at least one layer among the positive electrode active material layer, the negative electrode active material layer, and the solid electrolyte layer having a solid electrolyte, and a polymer including a nitrile group-containing polymerisation unit; the content ratio of the nitrile group-containing polymerisation unit in the polymer being 2-30 mass%; and the iodine value of the polymer being 0mg/100mg - 30mg/100mg inclusive.