ALL-SOLID-STATE LITHIUM-ION SECONDARY BATTERY AND PRODUCTION METHOD THEREOF

摘要

A method of producing an all-solid-state lithium-ion secondary battery including forming primary sintered bodies of an anode, a cathode, and a solid electrolyte layer; disposing the primary sintered body of the solid electrolyte layer between the primary sintered bodies of the anode and the cathode; forming a laminate of the primary sintered bodies and at least one of a first intermediate layer disposed between the anode and the solid electrolyte layer, and a second intermediate layer disposed between the cathode and the solid electrolyte layer; and firing the laminate to obtain a sintered body including an anode, a solid electrolyte layer, and a cathode, and at least one of a first intermediate layer and a second intermediate layer. In the resulting all-solid-state lithium-ion secondary battery, the first and second intermediate layers have a particle size that is smaller than that of the anode, cathode, and solid electrolyte layer.

主权项

1. A production method of an all-solid state lithium-ion secondary battery comprising:
a primary sintered body forming step of forming a primary sintered body of an anode, a primary sintered body of a cathode, and a primary sintered body of a solid electrolyte layer; a laminate forming step of disposing the primary sintered body of the solid electrolyte layer between the primary sintered body of the anode and the primary sintered body of the cathode, and disposing at least one of an undried first precursor layer formed by application of a first sol intermediate layer precursor on a surface of the primary sintered body of the anode nearer to the primary sintered body of the solid electrolyte layer or on a surface of the primary sintered body of the solid electrolyte layer nearer to the primary sintered body of the anode, and an undried second precursor layer formed by application of a second sol intermediate layer precursor on a surface of the primary sintered body of the cathode nearer to the primary sintered body of the solid electrolyte layer or on a surface of the primary sintered body of the solid electrolyte layer nearer to the primary sintered body of the cathode, thereby forming a laminate; and a firing step of firing the laminate to obtain a sintered body comprising an anode resulting from refiring of the primary sintered body of the anode, a cathode resulting from refiring of the primary sintered body of the cathode, and a solid electrolyte layer disposed between the anode and the cathode and resulting from refiring of the primary sintered body of the solid electrolyte layer, and comprising at least one of a first intermediate layer disposed between the anode and the solid electrolyte layer and resulting from firing of the first precursor layer, and a second intermediate layer disposed between the cathode and the solid electrolyte layer and resulting from firing of the second precursor layer, wherein at least one of a particle size of the first intermediate layer and a particle size of the second intermediate layer is smaller than those of the anode, the cathode, and the solid electrolyte layer.