Separator and preparation method thereof, secondary battery and device
AssigneeContemporary Amperex Technology (Hong Kong) Limited
InventorsWenhan Chen, Shaofei Wang
Life of this patent
Estimating the term…
Abstract
The present application provides a separator and a preparation method thereof, a secondary battery, and a device. The separator includes a microporous layer; the microporous layer includes an alkali metal-containing polymer, the alkali metal-containing polymer includes a polymer chain, and the polymer chain includes a first group and a second group; (a) the first group is selected from an organic acid alkali metal group, an alcohol alkali metal group, or a combination thereof; (b) the second group is selected from an organic acid group; an alkali metal content in the first group is 50-100 ppm based on a total mass of the separator; and a hydrogen content in the second group is 10-50 ppm based on the total mass of the separator.
Claims19
A separator, comprising:
- a microporous layer, wherein the microporous layer comprises an alkali metal-containing polymer, the alkali metal-containing polymer comprises a polymer chain, and the polymer chain comprises a first group and a second group;
- (a) the first group is selected from an organic acid alkali metal group, an alcohol alkali metal group, or a combination thereof;
- (b) the second group is selected from an organic acid group;
- an alkali metal content in the first group is 50-100 ppm based on a total mass of the separator;
- and
- a hydrogen content in the second group is 10-50 ppm based on the total mass of the separator.
A preparation method of a separator for a battery, comprising:
- providing a microporous matrix layer;
- and
- forming a modified film on at least part of a surface of the microporous matrix layer,
- wherein the modified film has an alkali metal-containing polymer, the alkali metal-containing polymer comprises a polymer chain, and the polymer chain comprises a first group and a second group;
- (a) the first group is selected from an organic acid alkali metal group, an alcohol alkali metal group, or a combination thereof;
- (b) the second group is selected from an organic acid group;
- an alkali metal content in the first group is 50-100 ppm based on a total mass of the separator;
- and
- a hydrogen content in the second group is 10-50 ppm based on the total mass of the separator.
Dependencies are inferred from the claim text.