Lg Chem, Ltd

Lg Energy Solution, Ltd.

Hyun-Sup Lee

Dong-Wook Sung

Dae-Sung Jang

Yeon-Soo Kim

So-Mi Jeong

Je-An Lee

Sang-Eun Kim

Myung-Han Lee

A method for evaluating the stability of a separator, including the steps of: preparing a separator; determining the elongation properties of the separator by using dynamic mechanical analysis (DMA); comparing the determined value with the stability standards of the elongation properties; and classifying a separator as a stability-passing separator when the determined values satisfy the stability standards, and classifying a separator as a stability-failing separator when the determined values do not satisfy the stability standards, after the comparison.

Method for evaluating stability of separator

Disclosed is a separator which includes a porous polymer substrate including a polymer showing a variation in phase angle represented by the following Formula 1 at 0.1 Hz depending on an increase in temperature. An electrochemical device including the separator is also disclosed.Variation in phase angle at 0.1 Hz=[(Phase angle&#x2212;Phase angle)/(Phase angle)]&#xd7;100&#x2265;0%,&#x2003;&#x2003;[Formula 1]wherein Phase anglemeans the phase angle of the porous polymer substrate at 0.1 Hz and 190&#xb0; C., and Phase anglemeans the phase angle of the porous polymer substrate at 0.1 Hz and 280&#xb0; C.

Separator with reduced ignition phenomenon upon battery perforation and battery including the same

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Daejeon, South Korea

Hyun-Sup Lee