Poly(vinylidene fluoride-hexafluoropropylene)를 이용한 이차전지용 미세다공성 분리막의 제조와 물성

국문 초록 (Abstract)

본 연구에서는 불소계 고분자인 PVdF (poly(vinylidene fluoride))에 HFP (hexafluoropropylene)가 결합된 공중합체인 PVdF-HFP로 충전용 이차전지의 분리막으로 쓰이는 다공성 막을 상전이 방법으로 제조하였다. 용매인 DMF (N,N-dimethylformamide)에 PVdF-HFP를 단일상으로 녹인 후 깨끗한 유리판에 캐스팅하여 막을 얻었다. 기공은 증류수로 채워진 응고조에서 용매-빈용매 교환으로 형성되어진다. 얻어진 분리막에서 가장 높은 공극률은 60%로 얻어졌다. 시차주사현미경(scanning electron microscopy, SEM)을 이용하여 분리막의 단면 관찰을 통해 다공성을 확인하였고 UTM (universal testing machine)을 이용하여 측정된 분리막의 인장강도는 PVdF-HFP 30 wt%에서 최대 6.57 MPa의 값을 나타내었다.

다국어 초록 (Multilingual Abstract)

The copolymer membranes, poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) were prepared by phase inversion method using as an additive with N,N-dimethylformamid as a solvent. The pores are generated during the solvent and non-solvent exchange process in the coagulation bath filled with non-solvent (distilled water). The highest porosity of the membrane was 60%. The surface and cross-section of the membranes was observed with a scanning electron microscopy (SEM). The mechanical property of the membrane was determined by using an universal testing machine (UTM). Tensile strength of measured membranes is presented the maximum 6.57 MPa at 30 wt% of PVdF-HFP.

참고문헌 (Reference)

1 "이차전지용 미세다공성 PVdF 분리막의 제조와 물성" 17 (17): 233-243, 2007

2 "리튬이온 이차전지에서의 미세다공성 격리막의 역할" 7 (7): 123-130, 1997

3 "리튬이온 2차전지용 분리막" 14 (14): 263-274, 2004

4 "The formation of microporous polyvinylidene difluoride membranes by phase separation" 1-20, 1991

5 "Structure porosity and conductivity of PVdF films for polymer electrolytes" 97 (97): 657-660, 2001

6 "Structure and performance of porous polymer electrolytes based on P VdF-HFP for lithium batteries" 103 : 286-292, 2002

7 "Preparation of PVdF HFP microporous membrane for Li ion batteries by phase inversion" 272 : 11-14, 2006

8 "Preparation and characterization of new microporous stretched membrane for lithium rechargeable battery" 7908-, 2006

9 "Pore filled PVDF 이온교환막의 제조 및 응용" 14 (14): 108-116, 2004

10 "Poly vinylidene fluoride based porous electrolytes" 46 : 1635-1639, 2001

11 "Plastic PVDF HFP electrolyte laminates prepared by a phase inversion process" 135 : 249-257, 2000

12 "Inert filler incorporated PVdF HFP composite electrolytes for lithium batteries" 159 : 1316-1321, 2006

13 "Electrochemical studies on poly vinylidene fluoride hexafluoropropylene membranes prepared by phase inversion method" 43 : 65-71, 2007

14 "Dale teeters characterization of PVdF HFP polymer membranes prepared by phase inversion technique morphology and charge discharge studies" 48 : 2143-2148, 2003

15 "Crystal structures of electrospun PVdF membranes and its separator application for rechargeable lithium metal cells" 10840-, 2006

16 "Conductivity study of porous plasticized polymer electrolytes based on poly vinylidene fluoride a comparison with poly propylene separators" 147 : 3219-3225, 2000