All-solid battery and manufacturing method of the same

A manufacturing method of an all-solid battery comprising:

• preparing a multilayer structure including:
• a green sheet containing oxide-based solid electrolyte powder, a layer formed on a first principal face of the green sheet by applying paste for a first electrode layer to the first principal face of the green sheet, and a layer formed on a second principal face of the green sheet by applying paste for a second electrode layer to the second principal face of the green sheet, no paste mainly composed of a metal being applied to at least the paste for the second electrode layer;
• and
• firing the multilayer structure, wherein
• the paste for the second electrode layer includes board-shaped carbon defined as carbon having an average thickness of 3 μm or less and a diameter in a longitudinal direction equal to or greater than three times the average thickness,
• wherein, in the second electrode layer, a proportion of fine-grained carbon defined as carbon made of particles having a primary particle size of 0.5 μm or less is 6 vol % or less,
• wherein the paste for the second electrode layer includes a solid electrolyte, and
• wherein the second electrode layer is a sintered layer after the firing, and
• wherein a D90 size of the diameter in the longitudinal direction of the board-shaped carbon is 2 μm or more and 30 μm or less.