SEPARATOR FOR ELECTROCHEMICAL DEVICE AND PROCESS FOR PREPARING THE SAME

摘要

The present invention relates to a manufacturing method for an electrochemical element separator with a volume resistivity of 1500 O·cm or less, determined by using a 20 kHz alternating current in a state where 1 mol/LiPF6/propylene carbonate solution is impregnated, the method being provided with the following: a step for applying onto a base material a slurry that includes at least cellulose fibers and a hydrophilic opening agent with a boiling point of at least 180°C; a step for drying the slurry and forming a sheet on the base material; and a step for peeling off the sheet from the base material to obtain a separator made of that sheet. The present invention is able to provide an electrochemical element separator that has exceptional performance, such as low internal resistance, as a separator for electrochemical elements, and also has high lithium cutoff characteristics not achievable with non-woven cloth or paper or such, and is inexpensive.