【摘要】 采用高压静电纺织法制备了适用于锂离子电池用的多微孔聚合物隔膜。通过改变不同的纺丝电压,能够得到一系列不同直径的聚合物纤维组成的聚偏氟乙烯(PVDF)电纺微孔膜。运用扫描电子显微镜技术(SEM)观测了电压对PVDF电纺膜形态结构的影响;DSC测试结果表明电纺后材料的结晶度被削弱,有助于提高微孔膜基体对电解液的亲和性。同时,得益于纳米纤维网状结构,电纺PVDF膜显示了高孔隙率和高电解液吸附的特点,样品室温电导率均在10-3S/cm以上,能够满足实际电池的要求;组装的扣式电池也显示了良好的循环性能和倍率放电性能。更多还原

【Abstract】 The microporous PVDF-based membranes were prepared by electrospinning technique,which could be used as microporous polymer electrolytes for lithium ion battery.Through changing applied voltage of electrospinning apparatus,a series of electrospun PVDF non-woven membranes with different average fiber diameters could be obtained.The effects of applied voltage on the structure of electrospun PVDF membranes were observed by SEM.Due to their nano-order fibers,these electrospun PVDF membranes had a very large specific surface and showed high porosity and uptake performance.Consequently,the electrospun PVDF membranes all exhibites high ion conductivities above 10-3 S/cm at room temperature,which can meet the requirement of actual lithium ion battery.The change of materials crystalline after electrospinning was examined by DSC.The coin cells consisting of Li/ electrospun PVDF/LiCoO2 shows excellent cycling characteristics and good rate discharge performance.更多还原