SEPARATOR FOR ELECTROCHEMICAL DEVICES, AND ELECTROCHEMICAL DEVICE

摘要

This separator for electrochemical devices is characterized by being provided with: a microporous first separator layer which is mainly formed of a thermoplastic resin and shuts down at a predetermined temperature; a microporous second separator layer which has heat resistance; and a microporous third separator layer which contains a low-melting-point material that melts at a lower temperature than the thermoplastic resin of the first separator layer, and which shuts down at a temperature that is lower than the shutdown temperature of the first separator layer. This separator for electrochemical devices is also characterized in that the low-melting-point material of the third separator layer has a melt viscosity of from 5 mPa·s to 100,000 mPa·s (inclusive) at 140°C.