SEPARATOR FOR USE IN ELECTROCHEMICAL CELL DEVICES

摘要

A separator (16) for use in laminated multi-layer electrochemical cell devic e structures. The separator comprises a microporous polyolefin membrane (24) with a polymer coating layer (26). The separator is treated to provide a deposited coating of a primary plasticizer (28) for the polymer coating laye r. The device positive and negative electrodes comprising a polymeric matrix composition (12, 18) and separator are assembled and laminated at a compressive force and temperature at which the plasticizer film softens the polymer coating of the separator sufficiently to establish a strong interfacial bond with the matrix polymers of the electrodes and thereby form a laminated unitary cell structure. The plasticizer subsequently volatilizes from the structure to further strengthen the interfacial bond, yet its temporary presence in the interfacial region of the multi-layer cell structu re enables lamination of the cell members at a temperature below the pore- collapse temperature of the separator membrane.