All-solid-state secondary cell

摘要

An all-solid-state secondary cell is provided comprising at least a positive electrode, a negative electrode and a solid electrolyte layer which is positioned between the positive electrode and the negative electrode. The positive electrode contains a positive electrode active material consisting of Na2Sx (x=1 to 8) and the solid electrolyte layer contains an ion conductive glass ceramics represented by a formula (I): Na2S-MxSy, wherein M is P, Si, Ge, B or Al; x and y each is an integer giving a stoichiometric ratio depending upon the type of M; and Na2S is contained in an amount of more than 67 mole % and less than 80 mole %.

主权项

1. An all-solid-state secondary cell comprising at least a positive electrode, a negative electrode and a solid electrolyte layer which is positioned between the positive electrode and the negative electrode, wherein:
the positive electrode contains a positive electrode active material consisting of a Na2Sx, wherein x=1 to 8, and the solid electrolyte layer contains an ion conductive glass ceramics having the formula Na2S—P2S5, wherein the Na2S of the solid electrolyte layer is contained in an amount from 70 to 75 mole %, and wherein the ion conductive glass ceramics has a state where crystal parts are dispersed in the glass ingredient of an amorphous state and the crystal parts contain tetragonal Na3PS4.