摘要
通过钛酸丁酯(TBTi)在聚偏氟乙烯(PVDF)溶液中水解原位生成二氧化钛(TiO2),采用静电纺丝方法制备了PVDF/TiO2复合隔膜,并考察了TiO2含量对隔膜表面形貌、热学性能、力学性能及聚合物电解质电化学性能的影响.结果表明,隔膜的拉伸强度和断裂伸长率由于TiO2的加入得到显著提高,最大增幅分别达到228.6%和244.8%,同时聚合物电解质的电化学性能也得到了增强,室温离子电导率从3.9 mS/cm增加到5.1 mS/cm.
Composite nanofiber separators of polyvinylidene fluoride （PVDF） and titanium dioxide （TiO2） were prepared by electrospinning of PVDF solution containing in situ generated TiO2. The effects of TiO2 contents on the seperators＇ structure and properties were investigated. The morphology of seperators was characterized by scanning electron microscopy （SEM） , and the fiber diameter distribution was also calculated using scnimage software. Differential scanning calorimetry （DSC） measurements were carried out to investigate seperator＇ s thermal properties such as melting point, melting enthalpy and crystallinity. The mechanical strength was determined by tensile tests. The ionic conductivity was determined by AC impedence method,and the decomposition potential was determined by linear sweeping voltammetry （LSV）. TI~ results indicate that the seperator＇ s tensile strength and elongation at break were improved remarkably after the addition of TiO2 , with the maximum increase rate of 228.6% and 244. 8% , respectively. The presence of TiO2 reduced the crystallinity of the seperators, which is benificial to the transfer of lithium ions. The polymer electrolytes＇ electrochemical performance was also enhanced, and the ionic conductivity at room temperature increased from 3.9 mS/cm to 5.1 mS/cm.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2012年第11期1319-1325,共7页
Acta Polymerica Sinica
基金
辽宁省自然科学基金(基金号20091060)
航空基金(基金号2010ZC54006)资助项目
