SOLID ELECTROLYTE, METHOD FOR MANUFACTURING SAME, ALL-SOLID-STATE SECONDARY CELL, AND METHOD FOR MANUFACTURING SAME

摘要

A solid electrolyte (3) is provided with particles (3X) having: a first portion (3A) that contains lanthanum (La), lithium (Li), titanium (Ti), and oxygen (O) as constituent elements; and a second portion (3B) that covers the surface of the first portion and includes lanthanum (La), lithium (Li), titanium (Ti), and oxygen (O) as constituent elements, sulfur (S) being bonded with oxygen-deficient sections thereof, and at least a surface (3C) thereof being oxidized.