METHOD FOR THE MANUFACTURE OF COMPOSITE SEPARATORS

• Main Authors: PIERI RICCARDO, MIELE MARCO, STANGA MILENA
• Format: Patent
• Language: English; Korean
• Published: 05.11.2014
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The present invention pertains to a process for the manufacture of a composite separator for an electrochemical cell, said process comprising the following steps: (i) providing a substrate layer; (ii) providing a coating composition comprising: -an aqueous latex comprising at least one vinylidene fluoride (VdF) polymer [polymer (F)] under the form of primary particles having an average primary particle size of less than 1 μm, as measured according to ISO 13321, and -at least one non-electroactive inorganic filler material; (iii) applying said coating composition onto at least one surface of said substrate layer to provide a coating composition layer; and (iv) drying said coating composition layer at a temperature of at least 60° C., preferably of at least 100° C., more preferably of at least 180° C. to provide said composite separator. The present invention also pertains to a coating composition suitable for use in said process, to the composite separator obtained from said process and to an electrochemical cell comprising said composite separator.