DRY-PROCESS POLYETHYLENE MEMBRANES, COATED MEMBRANES, SEPARATORS, AND RELATED METHODS

• Main Authors: ZHANG, Zhengming, ADAMS, Changqing Wang, REINARTZ, Stefan
• Format: Patent
• Language: English; French; German
• Published: 04.10.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TRANSPORTING

This application is directed to dry-process porous membranes comprising polyethylene and to methods for forming such membranes. Some of the dry-process porous membranes may comprise polyethylene that has been irradiated with electron-beam irradiation. The dry-process porous membranes disclosed herein may be used in the following: lithium ion batteries, including those utilizing nickel manganese cobalt oxide (NMC), lithium metal, or lithium iron phosphate (LFP) chemistries, and/or large format lithium ion batteries, textiles, garments, PPE, filters, medical products, house products, fragrance devices, and/or disposable lighters. In at least one embodiment, a multilayer porous membrane, comprises a dry-process polyethylene layer that has been treated with electron-beam radiation; and, an additional layer that has not been treated with electron-beam irradiation; and, optionally: wherein a dosage of the electron-beam radiation is from 20 kGy to 250 kGy, 50 kGy to 250 kGy, from 60 kGy to 200 kGy, from 70 kGy to 150 kGy, or from 80 kGy to 140 kGy; wherein the additional layer is laminated to the dry-process polyethylene layer that has been treated with electron-beam radiation; or wherein a blocking layer is laminated with a dry-process polyethylene layer and the additional layer to form a structure with the blocking layer between the dry-process polyethylene layer and the additional layer, and wherein the dry-process polyethylene layer is treated with electron beam irradiation to form the dry-process polyethylene layer that has been treated with electron-beam radiation. Also described is a textile, garment, PPE, filter, medical product, house product, fragrance device, or disposable lighter comprising the inventive membrane.