SOLID ELECTROLYTE, METHOD FOR PRODUCING SOLID ELECTROLYTE, SECONDARY BATTERY, AND ELECTRONIC APPARATUS

A lithium battery as a secondary battery includes a positive electrode composite material containing a solid electrolyte and a positive electrode active material containing lithium, a negative electrode as an electrode provided at one face of the positive electrode composite material, and a current collector provided at another face of the positive electrode composite material, wherein the solid electrolyte is a garnet-type fluorine-containing lithium composite metal oxide that is represented by the following compositional formula (1) or (2) and that conducts lithium. (LiGa) (LaNd)ZrOF (1) (LiGa) (LaCa) ZrOF (2) Provided that 0.1≤x≤1.0, 0