Separator for Power Storage Device

3:

• The separator for an electricity storage device according to claim 1, wherein, in the cross section passing through the center of the dot-shaped pattern, a ratio (R0<X≤1 (X=1)/X≥1) of a region where one layer of the particulate polymer is stacked to a region where one or more layers of the particulate polymer are present is 50% or less.

4:

• The separator for an electricity storage device according to claim 1, wherein, in the cross section passing through the center of the dot-shaped pattern, when a ratio (R1<X≤2/X≥1) of a region where more than one and two or less layers of the particulate polymer are stacked to a region where one or more layers of the particulate polymer are present is A, and a ratio (R0<X≤1 (X=1)/X≥1) of a region where one layer of the particulate polymer is stacked to a region where one or more layers of the particulate polymer are present is B, a ratio of B to A (R0<X≤1 (X=1)/X≥1/R1<X≤2/X≥1) is 0 or more and 1 or less.

6:

• The separator for an electricity storage device according to claim 1, wherein the particulate polymer has an average particle size of 0.10 μm or more and 0.80 μm or less.

7:

• The separator for an electricity storage device according to claim 1, wherein the thermoplastic polymer has at least two glass transition temperatures, at least one of the glass transition temperatures is within a range of lower than 20° C., and at least one of the glass transition temperatures is within a range of 40° C. or higher and 110° C. or lower.

8:

• The separator for an electricity storage device according to claim 1, wherein a total coverage area ratio of the thermoplastic polymer to the at least one surface of the substrate is 3% or more and 60% or less.

9:

• The separator for an electricity storage device according to claim 1, wherein a basis weight of the thermoplastic polymer-containing layer on the at least one surface is 0.03 g/m2 to 0.5 g/m2.

10:

• The separator for an electricity storage device according to claim 1, wherein a porous layer containing an inorganic filler and a resin binder is formed between the at least one surface of the substrate and the thermoplastic polymer-containing layer.

11:

• The separator for an electricity storage device according to claim 10, wherein the porous layer has a pore size of 0.03 μm or more and 0.40 μm or less.

12:

• The separator for an electricity storage device according to claim 10, wherein a ratio of a thickness of the thermoplastic polymer-containing layer to a thickness of the substrate or to a thickness of the substrate and the porous layer is 0.10 or more and 0.40 or less.

13:

• The separator for an electricity storage device according to claim 10, wherein the thermoplastic polymer-containing layer is provided on both sides of the substrate, a sum of maximum heights of the dots on the both sides is 0.2 μm or more and 4.5 μm or less, and a difference between the maximum heights of the dots on the both sides is more than 0.0 μm and 1.0 μm or less.

15:

• The method for producing a separator for an electricity storage device according to claim 14, further comprising, between the steps of preparing a substrate and forming a thermoplastic polymer-containing layer, applying another coating solution containing inorganic particles onto the substrate surface to form an inorganic particle-containing layer.

16:

• An electricity storage device comprising a positive electrode, a negative electrode, the separator for an electricity storage device according to claim 10, and a non-aqueous electrolyte solution, wherein the separator for an electricity storage device is disposed such that a side having the porous layer faces the positive electrode with respect to the substrate.

17:

• The separator for an electricity storage device according to claim 2, wherein, in the cross section passing through the center of the dot-shaped pattern, a ratio (R0<X≤1 (X=1)/X≥1) of a region where one layer of the particulate polymer is stacked to a region where one or more layers of the particulate polymer are present is 50% or less.

18:

• The separator for an electricity storage device according to claim 2, wherein, in the cross section passing through the center of the dot-shaped pattern, when a ratio (R1<X≤2/X≥1) of a region where more than one and two or less layers of the particulate polymer are stacked to a region where one or more layers of the particulate polymer are present is A, and a ratio (R0<X≤1 (X=1)/X≥1) of a region where one layer of the particulate polymer is stacked to a region where one or more layers of the particulate polymer are present is B, a ratio of B to A (R0<X≤1 (X=1)/X≥1/R1<X≤2/X≥1) is 0 or more and 1 or less.

20:

• The separator for an electricity storage device according to claim 2, wherein a porous layer containing an inorganic filler and a resin binder is formed between the at least one surface of the substrate and the thermoplastic polymer-containing layer.

21:

• The separator for an electricity storage device according to claim 20, wherein the porous layer has a pore size of 0.03 μm or more and 0.40 μm or less.

22:

• The separator for an electricity storage device according to claim 20, wherein a ratio of a thickness of the thermoplastic polymer-containing layer to a thickness of the substrate or to a thickness of the substrate and the porous layer is 0.10 or more and 0.40 or less.

23:

• An electricity storage device comprising a positive electrode, a negative electrode, the separator for an electricity storage device according to claim 20, and a non-aqueous electrolyte solution, wherein the separator for an electricity storage device is disposed such that a side having the porous layer faces the positive electrode with respect to the substrate.