绝缘材料
絕緣材料
절연재료
INSULATING MATERIALS
2015年
6期
13-17
,共5页
锂离子电池隔膜%静电纺丝%纳米纤维%聚偏氟乙烯%二氧化硅
鋰離子電池隔膜%靜電紡絲%納米纖維%聚偏氟乙烯%二氧化硅
리리자전지격막%정전방사%납미섬유%취편불을희%이양화규
lithium-ion battery separator%electrospinning%nanofiber%poly(vinylidene fluoride)%SiO2
采用静电纺丝法制备了SiO2含量分别为2%、5%和8%的PVDF/SiO2复合纤维膜，对复合纤维膜的物理性能、电化学性能以及组装电池性能等进行了测试分析。结果表明：纳米SiO2含量对静电纺PVDF基膜的纤维直径和形貌影响很大，随着SiO2含量的增加，静电纺PVDF/SiO2复合纤维膜的纤维直径变细且分布变宽，纤维表面的均匀性降低；其力学性能、电解液吸液率以及离子电导率均先增加后降低。以含量为5%的SiO2静电纺PVDF/SiO2复合纤维膜为隔膜组装的电池首周充放电容量最高，约为158 mAh/g；经过50周充放电循环后，电池的容量保持率最高为91%。
採用靜電紡絲法製備瞭SiO2含量分彆為2%、5%和8%的PVDF/SiO2複閤纖維膜，對複閤纖維膜的物理性能、電化學性能以及組裝電池性能等進行瞭測試分析。結果錶明：納米SiO2含量對靜電紡PVDF基膜的纖維直徑和形貌影響很大，隨著SiO2含量的增加，靜電紡PVDF/SiO2複閤纖維膜的纖維直徑變細且分佈變寬，纖維錶麵的均勻性降低；其力學性能、電解液吸液率以及離子電導率均先增加後降低。以含量為5%的SiO2靜電紡PVDF/SiO2複閤纖維膜為隔膜組裝的電池首週充放電容量最高，約為158 mAh/g；經過50週充放電循環後，電池的容量保持率最高為91%。
채용정전방사법제비료SiO2함량분별위2%、5%화8%적PVDF/SiO2복합섬유막，대복합섬유막적물이성능、전화학성능이급조장전지성능등진행료측시분석。결과표명：납미SiO2함량대정전방PVDF기막적섬유직경화형모영향흔대，수착SiO2함량적증가，정전방PVDF/SiO2복합섬유막적섬유직경변세차분포변관，섬유표면적균균성강저；기역학성능、전해액흡액솔이급리자전도솔균선증가후강저。이함량위5%적SiO2정전방PVDF/SiO2복합섬유막위격막조장적전지수주충방전용량최고，약위158 mAh/g；경과50주충방전순배후，전지적용량보지솔최고위91%。
PVDF/SiO2 composite fibrous membranes with 2%, 5%, and 8% of SiO2 were prepared by elec-trospinning method respectively, and their mechanical properties and electrochemical properties were tested as well as the performance of assembled battery. The results show that the addition of SiO2 has great in-fluence on the fiber diameter and morphology of electrospinning PVDF composite membranes. With the increase of SiO2 content, the fiber diameter and its distribution of the PVDF/SiO2 composite membrane become thinner and wider, and the surface uniformity of fiber reduces; its mechanical properties, electro-lyte uptake, and ionic conductivity increase at first and then decrease. The battery, assembled using PVDF/SiO2 composite membrane with 5% of SiO2, shows good charge and discharge performance, and its first discharge capacity is 158 mAh/g. The capacity retention ratio could reach 91% after 50 charge-discharge cycles.
