Patterned separator and battery comprising same
The present application relates to a separator and a battery comprising the same. A separator according to an exemplary embodiment of the present application includes: a porous substrate; and a first bonding layer pattern provided on at least one surface of the porous substrate, in which each pattern constituting the first bonding layer pattern is a pattern including a second bonding layer pattern having an aperture ratio of 5% or more and 40% or less.
1. A separator comprising:
a porous substrate; and
a first bonding layer pattern provided on at least one surface of the porous substrate,
wherein each pattern constituting the first bonding layer pattern consists of a second bonding layer pattern having an aperture ratio of 5% or more and 40% or less,
wherein the second bonding layer pattern is formed from a bonding composition comprising a binder solution, a solvent, and a surfactant, and
wherein the bonding composition comprises 49 wt % to 70 wt % of a binder solution, 29 wt % to 50 wt % of a solvent, and 0.1 wt % to 10 wt % of a surfactant, based on a total weight of the bonding composition.
2. The separator of claim 1 , wherein the first bonding layer pattern has a total aperture ratio of 20% or more and less than 80%.
3. The separator of claim 1 , wherein a form of each pattern constituting the second bonding layer pattern comprises at least one of a circle, an ellipse, and a polygon.
4. The separator of claim 1 , wherein each pattern constituting the second bonding layer pattern has a diameter of 10 μm to 100 μm.
5. The separator of claim 1 , wherein a gap between patterns constituting the first bonding layer pattern is 100 μm to 1,000 μm.
6. The separator of claim 1 , wherein the separator has a resistance of 0 ohm and more and 0.65 ohm or less.
7. The separator of claim 1 , wherein
the bonding composition has a viscosity of more than 0 cP and less than 30 cP.
8. The separator of claim 1 , wherein the second bonding layer pattern is formed by using a gravure printing method.
9. A battery comprising:
a separator, said separator comprising:
a porous substrate; and
a first bonding layer pattern provided on at least one surface of the porous substrate,
wherein each pattern constituting the first bonding layer pattern consists of a second bonding layer pattern having an aperture ratio of 5% or more and 40% or less.