All-solid-state battery and method for manufacturing same
AssigneeMaxell, Ltd.
InventorHaruki Kamizori
Life of this patent
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Abstract
The all-solid-state battery includes an electrode body formed by stacking a positive electrode and a negative electrode with a solid electrolyte layer interposed therebetween. The solid electrolyte layer is a stack of: a solid electrolyte layer (I) including a porous substrate and having a portion protruding from an end portion of the positive electrode and the negative electrode in a plan view; a solid electrolyte layer (II) bonded to the positive electrode and having a smaller area than that of the solid electrolyte layer (I) in a plan view; and a solid electrolyte layer (III) bonded to the negative electrode and having a smaller area than that of the solid electrolyte layer (I) in a plan view. At least one of (II) and (III) is different from (I).
Claims8
An all-solid-state battery comprising an electrode body formed by stacking a positive electrode and a negative electrode with a solid electrolyte layer interposed therebetween, wherein
- the solid electrolyte layer is a stack including:
- a solid electrolyte layer (I) including a porous substrate and having a portion protruding from an end portion of the positive electrode and the negative electrode in a plan view;
- a solid electrolyte layer (II) bonded to the positive electrode and having a smaller area than an area of the solid electrolyte layer (I) in a plan view;
- and
- a solid electrolyte layer (III) bonded to the negative electrode and having a smaller area than the area of the solid electrolyte layer (I) in a plan view,
- at least one of a solid electrolyte of the solid electrolyte layer (II) or a solid electrolyte of the solid electrolyte layer (III) is different from a solid electrolyte of the solid electrolyte layer (I), and
- an outer periphery of an end portion of the solid electrolyte layer (I) protrudes from an end portion of the positive electrode or the negative electrode by 1 μm to 1 mm in a plan view.
A method for producing an all-solid-state battery including an electrode body formed by stacking a positive electrode and a negative electrode with a solid electrolyte layer interposed therebetween,
- the solid electrolyte layer being a stack of a solid electrolyte layer (I) having a porous substrate, a solid electrolyte layer (II) bonded to the positive electrode, and a solid electrolyte layer (III) bonded to the negative electrode, at least one of a solid electrolyte of the solid electrolyte layer (II) and a solid electrolyte of the solid electrolyte layer (III) being different from a solid electrolyte of the solid electrolyte layer (I), the method comprising:
- preparing a solid electrolyte sheet including a porous substrate and a solid electrolyte held in the porous substrate;
- preparing a positive electrode having one surface covered with a solid electrolyte;
- preparing a negative electrode having one surface covered with a solid electrolyte;
- bonding the positive electrode to one surface of the solid electrolyte sheet in such a manner that the solid electrolyte covering the positive electrode is in contact with the one surface of the solid electrolyte sheet;
- and
- bonding the negative electrode to the other surface of the solid electrolyte sheet in such a manner that the solid electrolyte covering the negative electrode is in contact with the other surface of the solid electrolyte sheet, wherein
- the solid electrolyte sheet, the solid electrolyte covering the positive electrode, and the solid electrolyte covering the negative electrode are pressurized to form the solid electrolyte layer in such a manner that an outer periphery of an end portion of the solid electrolyte layer (I) protrudes from an end portion of the positive electrode or the negative electrode by 1 μm to 1 mm in a plan view.
Dependencies are inferred from the claim text.