Separator and battery comprising same

Patent metadata

Field	Value
Publication number	US-2018351194-A1
Application number	US-201615779275-A
Country	US
Kind code	A1
Filing date	Dec 19, 2016
Priority date	Dec 18, 2015
Publication date	Dec 6, 2018
Grant date	—

Abstract

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.

First claim

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.

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 second bonding layer pattern is formed from a bonding composition comprising a binder solution, a solvent, and a surfactant, and
the bonding composition has a viscosity of more than 0 cP and less than 30 cP.

8 . The separator of claim 7 , 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.

9 . The separator of claim 1 , wherein the second bonding layer pattern is formed by using a gravure printing method.

10 . A battery comprising the separator of claim 1 .

11 . A cliché for gravure printing, the cliché having a groove pattern provided on one surface thereof,
wherein at least one or more partition walls are comprised inside the groove.

12 . The cliché of claim 11 , wherein the partition wall has a height of 5 μm to 50 μm and a width of 5 μm to 50 μm.

13 . The cliché of claim 11 , wherein at least two or more partition walls are comprised inside the groove, and
a gap between the partition walls is 10 μm to 100 μm.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Kun Seok
• Lee Jungyeon
• Lee Seung Heon
• Jin Sun Mi
• Kwon Hyejin

Classifications

• H01M10/0459 Primary

  Cells or batteries with folded separator between plate-like electrodes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2/16

  Electricity · mapped topic

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M50/461 Primary

  with adhesive layers between electrodes and separators · CPC title