ALL-SOLID TYPE SECONDARY BATTERY AND METHOD FOR MANUFACTURING ALL-SOLID TYPE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide an all-solid type secondary battery which has a positive electrode layer, a negative electrode layer and a solid electrolytic layer firmly bound to one another, and is superior in ion conductivity.SOLUTION: An all-solid type secondary battery comprises: a positive electrode layer; a negative electrode layer; a solid electrolytic layer; a first binding agent which is insoluble in a nonpolar solvent and discontinuously present in at least one of the positive and negative electrode layers and the solid electrolytic layer; and a second binding agent which is soluble in the nonpolar solvent and contiguously present in at least one of the positive and negative electrode layers and the solid electrolytic layer. The first binding agent is different from the second binding agent in SP value. The first binding agent has an average particle diameter of 0.01-10 μm preferably. The first binding agent includes a compound having a constitutional unit expressed by (CH-CF). The absolute value of the difference in SP value between the two kinds of binding agents, i.e. the first and second binding agent is 3 or larger. The first binding agent may include a compound having a constitutional unit expressed by (CH-CH(OH)). The absolute value of the difference in SP value between the two kinds of binding agents is one or larger. It is preferable that the positive and negative electrode layers, and the solid electrolytic layer include a sulfide solid electrolyte.