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US 12,712,240 B2Granted
Separator having difference in porosity along thickness direction and manufacturing method thereof
AssigneeLG Energy Solution, Ltd.
InventorJi Won Min
Life of this patent
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Abstract
A separator for a secondary battery including a polyolefin and a separator body having a porous structure. The separator body has a difference in porosity along a thickness direction. It is possible to improve the problem of imbalance in ionic conductivity caused by differences in thickness and electrical conductivity between a positive electrode and a negative electrode.
Claims13
A separator for a secondary battery, comprising:
- a separator body having a porous structure, wherein the separator body consists of a polyolefin,
- wherein the separator body has a difference in porosity along a thickness direction,
- wherein the separator further comprises a first coating layer on a first surface of the separator body and a second coating layer on a second surface of the separator body, and
- wherein the first coating layer and the second coating layer are formed by coating the separator body.
1 more element
A separator for a secondary battery, comprising:
- a separator body having a porous structure, extending from a first surface of the separator body to a second surface of the separator body opposite to the first surface in a thickness direction, wherein the separator body consists of a polyolefin,
- wherein the porous structure has a difference in porosity along the thickness direction,
- wherein the separator further comprises a first coating layer on the first surface of the separator body and a second coating layer on the second surface of the separator body,
- wherein the separator has a difference in porosity between a first surface side and a second surface side of the separator body, and
- wherein the first coating layer and the second coating layer are formed by coating the separator body.
2 more elements
Dependencies are inferred from the claim text.