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Laminable, dimensionally-stable microporous webs

A microporous, microporous polymer technology for climate sustainability, sustainable manufacturing/processing, batteries containing two different electrolytes, etc., that can solve problems such as inability to achieve rapid wetting or swelling

Active Publication Date: 2019-02-05
安特克研发国际公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of certain polymeric binders mixed with inorganic particles, the surface layer is highly swellable by the electrolyte, but rapid wetting or swelling cannot be achieved in polyolefin substrates

Method used

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  • Laminable, dimensionally-stable microporous webs
  • Laminable, dimensionally-stable microporous webs
  • Laminable, dimensionally-stable microporous webs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A water-based dispersion was used to coat a 16 μm thick microporous, ultra-high molecular weight polyethylene-containing separator, EPH (Entek Membranes LLC, Oregon), the water-based dispersion contained the following:

[0060]

[0061] The coating dispersion contained 20 wt% solids and the Cabot alumina / Saint Gobain alumina / polyvinyl alcohol (PVOH) mass ratio was 48.5 / 48.5 / 3. CAB-O-SPERSE PG 008 is an aqueous dispersion of alumina with a primary particle size of 20nm and a surface area of ​​81m 2 / g. Saint Gobain CEM-1 is an aqueous dispersion of alumina with an average particle size of 500 microns.

[0062] The separators were dip-coated in a bath containing the water-based dispersion and the thickness of the wet layer was controlled on each side with a Mayer rod. The wetted membranes were then dried with a series of air knives and sent through a vertical oven set at 80°C and wound onto cores before testing.

[0063] The thermal shrinkage of the coated separat...

Embodiment 2

[0068] A 16 μm thick, microporous, UHMWPE-containing separator was coated using a water-based dispersion, EPH (Entek Membranes LLC, Oregon), the water-based dispersion contained the following:

[0069]

[0070] The coating dispersion contained 30 wt% solids and the Cabot alumina / Saint Gobain alumina / polyvinyl alcohol (PVOH) mass ratio was 48.5 / 48.5 / 3. CAB-O-SPERSE PG 008 is an aqueous dispersion of alumina with a primary particle size of 20nm and a surface area of ​​81m 2 / g. Saint Gobain CEM-1 is an aqueous dispersion of alumina with an average particle size of 0.5 μm.

[0071] The separators were dip-coated in a bath containing the water-based dispersion and the thickness of the wet layer was controlled on each side with a Mayer rod. The wetted membranes were then dried with a series of air knives and sent through a vertical oven set at 80°C and wound onto cores before testing.

[0072] The thermal shrinkage of the coated separators was determined. Three samples of ...

Embodiment 3

[0077] A 12 μm thick, microporous, UHMWPE-containing separator was coated using a water-based dispersion, EPH (Entek Membranes LLC, Oregon), the water-based dispersion contained the following:

[0078]

[0079] The coating dispersion contained 20 wt% solids and the mass ratio of alumina / PVDF-HFP / polyvinyl alcohol (PVOH) was 50 / 47 / 3. Dip coat the membrane in a bath containing the water-based dispersion and control the thickness of the wet layer on each side with a #18 Mayer rod. The wetted membranes were then dried with a series of air knives and sent through a vertical oven set at 80°C and wound onto cores before testing. The separator had a final thickness of 17.9 μm and a Gurley value of 369 seconds / 100 cc. Basis weight gain of 6.3g / m after coating and drying operations 2 . After subtracting the weight gain caused by PVDF-HFP, the weight of alumina (including PVOH) relative to the weight of the microporous polyethylene-containing base web yielded a coating ratio of a...

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Abstract

Laminable microporous polymer webs with good dimensional stability are disclosed herein. Methods of making and using laminable microporous polymer webs with good dimensional stability are also disclosed herein.

Description

[0001] Copyright Notice [0002] 2017 Amtek Research International LLC. Portions of the disclosure of this patent document contain material that is protected by copyright. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure as it appears in the US Patent and Trademark Office patent files or records, but otherwise reserves all copyrights. 37 CFR §1.71(d). technical field [0003] The present invention relates to the formation of self-supporting microporous polymeric networks (1) that exhibit good in-plane dimensional stability (i.e., at temperatures above and below the melting point of the base polymer film) , low shrinkage), (2) maintain shutdown properties, and (3) can be laminated to electrodes. At high temperatures, the pores within the bulk structure of the base polymer membrane begin to collapse or close, changing its permeability. Such meshes could be used as separators to improve the manufact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/02H01M6/24H01M10/04H01M10/36H01M50/403H01M50/417H01M50/426H01M50/431H01M50/449H01M50/489
CPCH01M50/457H01M50/431H01M50/417H01M50/411H01M50/403H01M50/46H01M50/489H01M10/0525H01M10/04H01G11/52H01G9/02H01M2220/20H01M50/449H01M50/44H01M50/426Y02E60/10H01M50/409H01M50/491
Inventor 韦斯顿·J·伍德丹尼尔·K·李理查德·W·帕卡拉
Owner 安特克研发国际公司