Patent ID: 7901598

Claim:
A solid electrolyte containing x atomic % of lithium, y atomic % of phosphorus, z atomic % of sulfur, and w atomic % of oxygen, wherein said x, said y, said z, and said w satisfy the following expressions (1)-(5): 20≦x≦45 (1) 10≦y≦20 (2) 35≦z≦60 (3) 1≦w≦10 (4) x+y+z+w= 100 (5), and apexes of X-ray diffraction peaks in an X-ray diffraction pattern obtained by an X-ray diffraction method using a Kα-ray of Cu exist at diffraction angles 2θ of 16.7°±0.25°, 20.4°±0.25°, 23.8°±0.25°, 25.9°±0.25°, 29.4°±0.25°, 30.4°±0.25°, 31.7°±0.25°, 33.5°±0.25°, 41.5°±0.25°, 43.7°±0.25°, and 51.2°±0.25°, respectively, in said X-ray diffraction pattern, and a half-width of each of said X-ray diffraction peaks is not larger than 0.5°.