A Study on the Improvement of the Thermal Stability of a Commercial Polyethylene Separator for Lithium Secondary Battery by an Electron Beam Irradiation
Joon‐Yong Sohn, Jong-Soo Lim, Sung-Jin Gwon, Junhwa Shin, Jae‐Hak Choi, Young Chang Nho · Polymer(Korea) · 2008
In this study we prepared crosslinked separators with the improved thermal stability by irradiating a commercial polyethylene (PE) separator for lithium secondary battery with an electron beam, and the thermal and mechanical properties of the prepared separators were evaluated as a function of the absorption dose. The thermal shrinkage of electron beam irradiated separator was decreased with increasing absorption dose. As a result of the shutdown behavior using an AC impedance, it was observed that the irradiated separator had the better shutdown function than the unirradiated separator. The modulus of the irradiated separator was enhanced as the absorption dose was increased, while the tensile strength and the break elongation of the irradiated separator were decreased.