SOLID ELECTROLYTE COMPOSITION, SOLID ELECTROLYTE, LITHIUM ION SECONDARY BATTERY, AND METHOD FOR PRODUCING LITHIUM ION SECONDARY BATTERY

摘要

Provided are a solid electrolyte composition and a solid electrolyte which exert excellent lithium ion conductivity and strength at low temperatures. Also provided are a lithium ion secondary battery and a method for producing a lithium ion battery in which the charging/discharging performance and the strength of the solid electrolyte layer are improved at low temperatures. The matrix of a solid electrolyte has a nanostructure in which a nonreactive polyalkylene glycol is held onto a co-crosslinked product in which a highly branched polymer and a crosslinkable ethylene oxide multicomponent copolymer are chemically crosslinked. A lithium salt is dissolved in the matrix. A negative electrode active material layer is formed by dispersing a negative electrode active material and a conductive assistant in a lithium ion conductive solid electrolyte. A positive electrode active material layer is formed by dispersing a positive electrode active material and a conductive assistant in a lithium ion conductive solid electrolyte.