Lithium ion battery separator manufactured from composite fibers composed of polypropylene core and alkali-soluble polyester with polyethylene skin and manufacturing method of the same
US11189882B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jun 8, 2018 |
| Grant date | Nov 30, 2021 |
| Priority date | — |
| Expiry date | Nov 10, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a new lithium ion battery separator and a manufacturing method therefor, composite fine-denier POY fibers with polypropylene PP acting as a core and alkali-soluble polyester COPET and polyethylene PE acting as a skin are produced by means of a chemical fiber composite spinning technology, wherein the COPET and PE are distributed as an islands-in-the-sea form, then the POY fibers are arranged as a fabric with a certain breadth by means of beam-warping, the fabric is subjected to stretching and hot-pressing by a hot roll such that the PE component having a low melting point is melted and joined to form a film, and then the COPET is dissolved away by means of an alkali solution such that a place where the COPET is present in the film become pores and PP fibers become the skeleton of the film, thus forming a lithium ion battery separator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.