폴리에틸렌 / 육티탄산칼륨 휘스커 복합재료에 의한 축전지격리막의 제조에 관한 연구 = A Study on the Preparation of Battery Separator for Polyethylene / Potassium Hexatitanate Whisker

다국어 초록 (Multilingual Abstract)

The mixtures of ultra-high molecular weight polyethylene (UHMWPE), high density polyethylene (HDPE), process oil (mineral oil) and potassium hexatitanate whisker were melted and mixed at 150℃ for 30 min, and prepared by compression molding to the specimen of separator of about 200㎛ thickness at the same temperature and 5000 psi. Thereafter the pores were formed by extracting process oil with organic solvents. In this study, the range of PR (the ratio polymer to process oil) was varied from 0.1 to 0.5 because the specimen turned into rubbery phase at which PR was below 0.1 whereas it changed into gel phase at which PR was above 0.5. When the specimen was treated with nonpolar organic solvents, process oil was extracted nearly 98%. Tensile strengh was 31 kg/㎠ at PR = 0.426, and resistance of specimen was 37 mΩ/㎠ at PR = 0.186, and 53 mΩ/㎠ at PR = 0.426. The N₂adsorption-desorption isotherm showed a hysteresis representing regions of capillary condensation, and the surface area at PR = 0.186 was relatively large as 130 ㎠/g. Potassium hexatitanate whisker was randomly dispersed in between PE layers. It might be that the whisker is intercalated through the PE thin layers oriented by compression.