All-solid secondary cell, solid electrolyte composition and cell electrode sheet used in same, and method for manufacturing cell electrode sheet and all-solid secondary cell

The objective of the present invention is to provide an all-solid secondary cell in which high ion conductivity (high cell voltage) and cycle characteristics can be achieved by suppressing the increase in interfacial resistance between an inorganic solid electrolyte and an active material, etc., and to provide a solid electrolyte composition and cell electrode used in the all-solid secondary cell, and a method for manufacturing the cell electrode sheet and all-solid secondary cell. The present invention is an all-solid secondary cell having, in the stated order, a positive-electrode active-material layer, an inorganic solid electrolyte layer, and a negative-electrode active-material layer, wherein the invention pertains to an all-solid secondary cell, a solid electrolyte composition and cell electrode sheet used in the all-solid secondary cell, and a method for manufacturing the cell electrode sheet and all-solid secondary cell in which: at least one layer, among the positive-electrode active-material layer, the inorganic electrolyte layer, and the negative-electrode active-material layer, includes a polymer and an inorganic solid electrolyte; the polymer is a crosslinking polymer having in the main chain both a heteroatom and a carbon-carbon unsaturated bond that does not contribute to aromaticity; and the inorganic solid electrolyte contains a metal belonging to Group 1 or Group 2 of the periodic table, and has the ion conductivity of the contained metal.