Separator for secondary battery, manufacturing method thereof, method for manufacturing secondary battery comprising the separator and secondary battery manufactured by the method
US-12183949-B2 · Dec 31, 2024 · US
Polyolefin microporous membrane, production method therefor, and battery separator
US10686175B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10686175-B2 |
| Application number | US-201515539084-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 25, 2015 |
| Priority date | Dec 26, 2014 |
| Publication date | Jun 16, 2020 |
| Grant date | Jun 16, 2020 |
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Abstract
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A polyolefin microporous membrane is disclosed. The membrane includes a polyolefin resin having an MFR value of not greater than 2.0 g/10 min, and a crystal nucleating agent. The polyolefin microporous membrane has an air permeation resistance scaled to a thickness of 20 μm of from 100 to 500 sec/100 cc, a porosity of from 20% to 60%, and a mean flow pore size of not greater than 100 nm.
First claim
Opening claim text (preview).
The invention claimed is: 1. A polyolefin microporous membrane, comprising: a polyolefin resin having an MFR value of not greater than 2.0 g/10 min; and a crystal nucleating agent, wherein the polyolefin microporous membrane has an air permeation resistance scaled to a thickness of 20 μm of from 100 to 500 sec/100 cc, a porosity of from 20% to 60%, and a mean flow pore size of not greater than 100 nm, wherein a half-crystallization period t 1/2 of the polyolefin microporous membrane is not greater than 2.0 minutes during an isothermal crystallization at 123° C. 2. The polyolefin microporous membrane according to claim 1 , wherein the polyolefin resin comprises not less than 90 mass % of a polyethylene resin. 3. The polyolefin microporous membrane according to claim 1 , wherein the mean flow pore size is not greater than 50 nm. 4. The polyolefin microporous membrane according to claim 1 , having a dielectric breakdown voltage of not less than 163 V/μm. 5. The polyolefin microporous membrane according to claim 1 , having a dielectric breakdown voltage of not less than 175 V/μm. 6. A battery separator, comprising: a polyolefin microporous membrane, comprising: a polyolefin resin having an MFR value of not greater than 2.0 g/10 min; and a crystal nucleating agent, wherein the polyolefin microporous membrane has an air permeation resistance scaled to a thickness of 20 μm of from 100 to 500 sec/100 cc, a porosity of from 20% to 60%, and a mean flow pore size of not greater than 100 nm, wherein a half-crystallization period t 1/2 of the polyolefin microporous membrane is not greater than 2.0 minutes during an isothermal crystallization at 123° C. 7. A rechargeable battery, comprising: a battery separator, comprising: a polyolefin microporous membrane, comprising: a polyolefin resin having an MFR value of not greater than 2.0 g/10 min; and a crystal nucleating agent, wherein the polyolefin microporous membrane has an air permeation resistance scaled to a thickness of 20 μm of from 100 to 500 sec/100 cc, a porosity of from 20% to 60%, and a mean flow pore size of not greater than 100 nm, wherein a half-crystallization period t 1/2 of the polyolefin microporous membrane is not greater than 2.0 minutes during an isothermal crystallization at 123° C. 8. A method of producing a polyolefin microporous membrane, the polyolefin microporous membrane having an air permeation resistance scaled to 20 μm of from 100 to 500 sec/100 cc, a porosity of from 20% to 60%, and a mean flow pore size of not greater than 100 nm, the method comprising: melt-kneading a polyolefin resin, a crystal nucleating agent, and a membrane formation solvent to form a polyolefin resin composition; extruding and cooling the polyolefin resin composition to form a gel sheet; performing a first stretching step of stretching the gel sheet; removing the membrane formation solvent from the gel sheet after stretching; and drying the gel sheet after removing the membrane formation solvent. 9. The method according to claim 8 , wherein the polyolefin resin has an MFR value of not greater than 2.0 g/10 min.
Assignees
Inventors
Classifications
Polyolefins · CPC title
Porosity · CPC title
Moulding; Embossing; Cutting · CPC title
Microporous · CPC title
- H01M50/403Primary
Manufacturing processes of separators, membranes or diaphragms · CPC title
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Frequently asked questions
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- What does patent US10686175B2 cover?
- A polyolefin microporous membrane is disclosed. The membrane includes a polyolefin resin having an MFR value of not greater than 2.0 g/10 min, and a crystal nucleating agent. The polyolefin microporous membrane has an air permeation resistance scaled to a thickness of 20 μm of from 100 to 500 sec/100 cc, a porosity of from 20% to 60%, and a mean flow pore size of not greater than 100 nm.
- Who is the assignee on this patent?
- Toray Industries
- What technology area does this patent fall under?
- Primary CPC classification H01M50/403. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 16 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).