COLLECTOR, ELECTRODE, SECONDARY CELL, AND CAPACITOR

摘要

A current collector which can realize sufficient safety function even when the cell is deformed by external force or when the internal pressure is increased; and an electrode, a secondary battery, and a capacitor using the current collector; are provided. A current collector, including: a metal foil; and a conductive layer formed on a surface of the metal foil; is provided. Here, regarding the current collector, a temperature-resistance curve of the current collector obtained by sandwiching the current collector in between brass electrodes of 1cm diameter, the measurement of resistance being performed with conditions of 15N of load between the electrodes and temperature being raised from ambient temperature at a rate of 10°C/min satisfies a relation of R (Ta+5) /R (Ta-5) ‰¥ 1, R (Ta+5) being resistance at temperature Ta+5°C and R (Ta-5) being resistance at temperature Ta-5°C, Ta being a temperature higher than a temperature satisfying a relation of (R (T) /R (T-5) ) > 2.0 and first satisfying a relation of (R (T) /R (T-5) ) < 2.0.