| 초록 |
Lithium ion battery (LIB) has taken a great part in modern industry and daily life because of its non-substitutable capability in energy storage system. However, safety problems such as explosion are occasionally reported, ensuing from thermally vulnerable property of commercial PE separator. So, safety issue about thermal stability is a problem awaiting solution to be solved, satisfying electrochemical characteristics and stability as well. In this work, tailored composite separator with uniform morphology is introduced to replace precarious PE separator, arising from nano-scale graphene oxide for controlling pore structure and distribution in polymeric coating layer via γ-ray irradiation technique. Uniform ion flux by regular pore morphology induces stable cell characteristics with various current density and long cycles. Moreover, its controlled morphology is not devastated and shrunk in harsh environment at 150℃ condition, showing excellent thermal stability. |
