Method for manufacturing all-solid battery

A method for manufacturing an all-solid battery having stacked therein, in order, a positive electrode laminate, an intermediate solid electrolyte layer, and a negative electrode laminate, comprising:

• (i) applying pressure to the positive electrode laminate,
• (ii) applying pressure to the negative electrode laminate, and
• (iii) applying pressure to the positive electrode laminate, the intermediate solid electrolyte layer, and the negative electrode laminate, wherein:
• the pressing pressure of the step (i) is higher than the pressing pressure of the step (iii), and
• the pressing temperature of the step (i) is from 150 to 175° C.;
• the pressing pressure of the step (ii) is higher than the pressing pressure of the step (iii), and the pressing temperature of the step (ii) is 125° C. or less;
• the pressing temperature of the step (iii) is 125° C. or less;
• the positive electrode laminate has a positive electrode collector layer and a positive electrode active material layer in this order or has a positive electrode collector layer, a positive electrode active material layer and a first solid electrolyte layer in this order;
• the negative electrode laminate has a negative electrode active material layer and a copper-containing negative electrode collector layer in this order or has a second solid electrolyte layer, a negative electrode active material layer, and a copper-containing negative electrode collector layer in this order;
• at least one of the first solid electrolyte layer and the second solid electrolyte layer is present;
• and
• the intermediate solid electrolyte layer before the pressing in the step (iii) is not pressed at a pressure exceeding the pressing pressure of the step (iii).