All solid battery and detecting method of end point voltage of the same

An all solid battery comprising:

• an oxide solid electrolyte layer;
• a positive electrode layer that is provided on a first main face of the oxide-based solid electrolyte layer and includes a positive electrode active material;
• and
• a negative electrode layer that is provided on a second main face of the oxide-based solid electrolyte layer and includes a negative electrode active material,
• wherein the positive electrode active material includes a first electrode active material and a second electrode active material,
• wherein the average operation potential vs Li/Li+ of the first electrode active material is higher than the average operation potential vs Li/Li+ of the second electrode active material,
• wherein, in a cross section of the positive electrode layer, an area ratio of the first electrode active material with respect to a total area of the first electrode active material and the second electrode active material is 85% or more, and
• wherein, in the cross section of the positive electrode layer, an area ratio of the second electrode active material with respect to the total area of the first electrode active material and the second electrode active material is 5% or more,
• wherein the first electrode active material is LiCoPO4,
• wherein the second electrode active material is Li6Co5(P2O7)4;
• wherein, in the cross section of the positive electrode layer, the area ratio of the first electrode active material is larger than the area ratio of the second electrode active material, and
• wherein, in the positive electrode layer, a weight ratio of the first electrode active material is 9 times or more and 10 times or less than a weight ratio of the second electrode active material.