Back to results
US 2025/0167390 A1Published application
Method for Producing Separator for Power Storage Device
AssigneeAsahi Kasei Battery Separator Corporation
InventorsXun Zhang, Hayato Matsuyama, Tetsushi Nakao
Life of this patent
Estimating the term…
Abstract
Provided is a method for producing a separator for a power storage device, the method including: a step for extruding powdered polyethylene, pelletized polypropylene, and a plasticizer into a sheet form using an extruder to form a molded body; and a step for making the molded body porous by a wet method.
Claims8
1-7. (canceled)
8:
- A separator for a power storage device comprising a microporous membrane, wherein:
- the microporous membrane comprises polyethylene and polypropylene, and
- in X-ray diffraction (XRD) analysis of the microporous membrane, the crystallite size of the polyethylene is 15 nm to 40 nm and the crystallite size of the polypropylene is 10 nm to 50 nm.
9:
- The separator for a power storage device according to claim 8, wherein in the XRD analysis of the microporous membrane, the degree of crystallinity of the polyethylene is 55% to 99.9%.
10:
- A separator for a power storage device comprising a microporous membrane, wherein:
- the microporous membrane comprises polyethylene and polypropylene, and
- in wide-angle X-ray scattering (WAXS) analysis of the microporous membrane, the crystallite size of the polyethylene is 15 nm to 40 nm and the crystallite size of the polypropylene is 10 nm to 50 nm.
11:
- The separator for a power storage device according to claim 10, wherein in the WAXS analysis of the microporous membrane, the degree of crystallinity of the polyethylene is 50% to 90%.
12:
- The separator for a power storage device according to claim 8, wherein the isotactic pentad fraction (mmmm) of the polypropylene in the microporous membrane is 85.0 mol % to 99.7 mol %.
(canceled)
14:
- The separator for a power storage device according to claim 10, wherein the isotactic pentad fraction (mmmm) of the polypropylene in the microporous membrane is 85.0 mol % to 99.7 mol %.
Dependencies are inferred from the claim text.