Preparation of a new micro-porous poly(methyl methacrylate)-grafted polyethylene separator for high performance Li secondary battery |
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| Authors: | Sung-Jin Gwon Jae-Hak Choi Young-Eon Ihm |
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| Affiliation: | a Radiation Research Division for Industry and Environment, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup-si, Jeollabuk-do 580-185, South Korea
b Department of Materials Engineering, Chnugnam National University, Yuseong-gu, Daejeon 305-764, South Korea |
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| Abstract: | In this study, micro-porous poly(methyl methacrylate)-grafted polyethylene separators (PE-g-PMMA) were prepared by a radiation-induced graft polymerization of methyl methacrylate onto a conventional PE separator followed by a phase inversion. After the phase inversion, the micro-pores were generated in the grafted PMMA layer. The prepared micro-porous PE-g-PMMA separators showed an improved electrolyte uptake and ionic conductivity due to their improved affinity with a liquid electrolyte and the presence of pores in the grafted PMMA layer. The PE-g-PMMA separators exhibited a lower thermal shrinkage compared to the original PE separator. The PE-g-PMMA separators showed a better oxidation stability up to 5.0 V when compared to the original PE separator (4.5 V). |
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| Keywords: | 81.05.Lg 82.35.&minus x 82.35.Lr 82.45.&minus h 82.45.Wx 82.47.&minus a 82.47.Aa |
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