Solid electrolyte-containing sheet, solid electrolyte composition, all-solid state secondary battery, and methods for manufacturing solid electrolyte-containing sheet and all-solid state secondary battery

A solid electrolyte composition comprising:

• an inorganic solid electrolyte (A) having a conductivity of an ion of a metal belonging to Group I or II of the periodic table;
• an inorganic compound (C) having a film on a surface;
• and
• a dispersion medium (F),
• wherein the film contains a solid electrolyte (B) and has a conductivity of an ion of a metal belonging to Group I or II of the periodic table, and
• wherein the inorganic solid electrolyte (A) and the solid electrolyte (B) are compounds represented by Formula (I),
• La1Mb1Pc1Sd1Ae1 Formula (1)
• in the formula, L represents an element selected from Li, Na, and K, M represents an element selected from B, Zn, Sn, Si, Cu, Ga, Sb, Al, and Ge, A represents an element selected from I, Br, Cl, and F, al to el represent compositional ratios of the respective elements, and a1:b:1:c1:d1:e1 satisfies 1 to 12:0 to 5:1:2 to 12:0 to 10.