Particles, composites, sheets and electricity storage devices

Abstract

The purpose of the present invention is to provide particles (19) capable of surface optimization, a composite (10), a sheet (15), and a power storage device (11). The particles are an oxide-based solid electrolyte. A graph (22) of cumulative pore volume distribution in which a logarithmic-scale horizontal axis indicates the particle-pore diameter and the vertical axis indicates the particle-pore volume includes an inflection point (25) between a first point (23) at a pore diameter of 10.3 μm and a second point (24) at a pore diameter of 3.6 nm. The slope of a tangent (27) at a point on the graph heading from the first point toward the second point is such that the slope of a tangent between the inflection point and the second point is greater on either side of the inflection point in comparison with the slope of a tangent between the first point and the inflection point. The composite contains particles and an electrolyte. The sheet contains the composite.

Claims

1. Particles of an oxide-based solid electrolyte, a graph of the cumulative pore volume distribution, in which the horizontal axis of a logarithmic scale represents the pore diameter of the particle and the vertical axis represents the pore volume of the particle, includes a change point between a first point at a pore diameter of 10.3 μm and a second point at a pore diameter of 3.6 nm; Particles in which the slope of the tangent line at a point on the graph going from the first point to the second point is larger before and after the change point than the slope of the tangent line between the first point and the change point.

2. The graph has a line segment connecting the first point and the change point with a slope of 0.035 cm. ３ 2. The particles according to claim 1, wherein the particle size is 1 / g / μm or less.

3. The sum of the pore volumes between the first point and the change point is 0.2 cm ３ 3. The particles according to claim 1, wherein the particle size is 1 / g or less.

4. The sum of the pore volumes between the first point and the second point is 0.4 cm ３ 3. The particle according to claim 1, wherein the particle size is less than 1 / g.

5. 3. The particles according to claim 1, wherein the solid electrolyte has a garnet-type crystal structure containing Li, La, and Zr.

6. A composite comprising the particles according to claim 1 or 2 and an electrolyte solution.

7. A sheet comprising the composite of claim 6.

8. An electricity storage device including a positive electrode layer, a negative electrode layer, and a separator separating the positive electrode layer and the negative electrode layer, An electricity storage device comprising the composite of claim 6.

9. The electricity storage device according to claim 8 , wherein the separator includes the composite.

10. At least one of the positive electrode layer and the negative electrode layer includes a current collecting layer; a protective layer in contact with at least one of the separator and the current collecting layer; The electricity storage device according to claim 8 , wherein the protective layer includes the composite.

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