| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 기능성 고분자 |
| 제목 | Studies on the characteristics of the PVdF membranes based on the morphology and ionic conductivity for lithium rechargeable batteries |
| 초록 | The separator plays an important role in rechargeable lithium batteries to keep the positive and negative electrodes apart to prevent electrical short circuits and at the same time allow rapid transport of ionic charge carriers that are needed to complete the circuit during the passage of current in an electronic chemical cell. Commerciallized PE separators have good mechanical properties. On the other hand, they exhibit poor compatibility with liquid electrolytes due to their hydrophobic property and their manufacturing cost is high. To enhance the affinity with liquid electrolytes, it is possible to use more wettable polymer with liquid electrolytes. PVdF, PAN, PEO, PP, etc. were studied in last years. In this work, a novel microporous membrane based on PVdF is prepared. PVdF has been known as a very versatile polymer material because of its outstanding electrical properties. Nevertheless its outstanding electrical properties, mechanical property of PVdF membrane is poor than that of commercialized PE separator which is one of the most important deficiencies preventing them from being used in practical cells. For example, the poor mechanical strength of polymer electrolytes can lead to internal short-circuits and safety hazards. In this paper, we have studied the enhancement of mechanical properties and electrical properties of PVdF membranes. The novel microporous membrane based on PVdF is prepared. The PVdF matrix can enhance the compatibility with liquid electrolytes and their pore structure is generated through a phase inversion process with non-solvent water. Before phase inversion, dry process is newly introduced to increase crystallinity of membrane for increase mechanical strength. Then, uni-axial drawing is adopted. The physical and electrochemical characteristics of this novel microporous membrane are presented. Reference 1. Linden, D. ; Reddy, T. B. Handbook of Batteries, 3rd ed, Mcgraw Hill, New york, 2002. 2. Basenhard, J. O. Editor, Handbook of Battery Materials, Wiley-VHS: Weinheim, Germany, 1999. 3. Y. M. Lee, J. W. Kim, N. S. Choi, J. A. Lee, W. H. Seol and J. K. Park, J. Power Sources, 139 (2005) 235-241. Acknowledgement to Ministry of Commerce, Industry and Energy in KOREA. |
| 저자 | 설완호1, 이용민1, 서정은1, 고동현1, 이존하2, 박정기1 |
| 소속 | 1Korea Advanced Institute of Science and Technology, 2SKC |
| 키워드 | 멤브레인; 세퍼레이터; 분리막; 리튬이차전지; 폴리머전지 |
