Solid electrolyte laminated sheet and solid state battery
Provided is a solid electrolyte laminated sheet having a self-supporting property and capable of realizing a solid state battery having high output characteristics. A plurality of supports are used, a solid electrolyte is filled in each support to form a self-supporting sheet, and the self-supporting sheets are superimposed to form a solid electrolyte laminated sheet. Specifically, the solid electrolyte laminated sheet is configured by setting a layer of the solid electrolyte laminated sheet in contact with a positive electrode layer being the outermost layer as a self-supporting sheet in which a solid electrolyte resistant to oxidation is filled, and a layer in contact with a negative electrode layer being the opposite outermost layer as a self-supporting sheet in which a solid electrolyte resistant to reduction is filled.
1. A solid state battery, comprising:
a positive electrode layer containing a positive electrode active material;
a negative electrode layer containing a negative electrode active material; and
a solid electrolyte layer located between the positive electrode layer and the negative electrode layer, wherein the solid electrolyte layer comprises a solid electrolyte laminated sheet, and the solid electrolyte laminated sheet comprises:
a plurality of supports,
wherein the supports are a plurality of self-supporting sheets, and each of the self-supporting sheets is filled with a solid electrolyte,
the supports have a porosity of 86% or more and 95% or less,
the supports comprise at least one selected from the group consisting of an aramid fiber, an Al 2 O 3 and a glass fiber, and
the self-supporting sheets constitute a laminate, wherein
one outermost layer is a self-supporting sheet in which a solid electrolyte resistant to oxidation is filled and in which is in contact with the positive electrode layer, and
the other outermost layer is a self-supporting sheet in which a solid electrolyte resistant to reduction is filled and in which is in contact with the negative electrode layer.
2. The solid electrolyte laminated sheet according to claim 1 , wherein
the supports have a thickness of 5 μm to 30 μm.
3. The solid electrolyte laminated sheet according to claim 1 , wherein the solid electrolyte contains a lithium element.
4. The solid electrolyte laminated sheet according to claim 2 , wherein the solid electrolyte contains a lithium element.
5. The solid electrolyte laminated sheet according to claim 1 , wherein the solid electrolyte contains at least either phosphorus or sulfur.
6. The solid electrolyte laminated sheet according to claim 2 , wherein the solid electrolyte contains at least either phosphorus or sulfur.
7. The solid electrolyte laminated sheet according to claim 4 , wherein the solid electrolyte contains at least either phosphorus or sulfur.