All solid state battery

Abstract

A main object of the present disclosure is to provide an all solid state battery with low resistance. The present disclosure achieves the object by providing an all solid state battery comprising a cathode active material layer, an anode active material layer, and a solid electrolyte layer arranged between the cathode active material layer and the anode active material layer; wherein the anode active material layer includes: a first anode active material and a second anode active material; the first anode active material is a lithium titanate; in the second anode active material, when a discharge capacity at a potential of 1.0 V vs Li/Li or more and 2.0 V vs Li/Li or less signifies 100% discharge capacity, and when Pdesignates an average potential in a capacity of 0% or more and 50% or less of the 100% discharge capacity, and Pdesignates an average potential in a capacity of 50% or more and 100% or less of the 100% discharge capacity, a difference between the Pand the Pis 0.1 V or more; and when T designates a thickness of the anode active material layer, X designates a region of the anode active material layer that is from an edge of the solid electrolyte layer side to T/2 in a thickness direction, Y designates a region of the anode active material layer that is from the T/2 to an opposite edge from the solid electrolyte layer side in the thickness direction, Xdesignates a volume ratio of the first anode active material with respect to a total of the first anode active material and the second anode active material in the X, and Ydesignates a volume ratio of the first anode active material with respect to a total of the first anode active material and the second anode active material in the Y, the Xis smaller than the Y.