COMPOSITION FOR FORMING SOLID ELECTROLYTE LAYER, METHOD FOR FORMING SOLID ELECTROLYTE LAYER, SOLID ELECTROLYTE LAYER, AND LITHIUM ION SECONDARY BATTERY

摘要

A composition for forming a solid electrolyte layer for use in the formation of a solid electrolyte layer of a lithium ion secondary battery contains first particles made of a lanthanum titanate and second particles made of a lithium titanate. It is preferable that the first particles have an average particle size of 50 nm or more and 300 nm or less. It is preferable that the second particles have an average particle size of 10 nm or more and 50 nm or less.