超级电容器用原纤化天丝隔膜的制备及性能研究

Study on Preparation and Properties of Fibrillated Tencel Separator for Supercapacitor

通过对天丝短切纤维进行打浆处理,获得了具有不同原纤化程度的天丝纤维,并结合湿法成形技术制备得到原纤化天丝隔膜。探究了纤维几何尺寸和形貌对隔膜孔隙结构的影响,对不同孔隙结构隔膜制备的超级电容器电化学性能进行了分析。结果表明,天丝纤维经过不同打浆转数处理后,纤维尺寸和隔膜孔隙结构发生了明显变化。随着打浆转数的增加(20000~250000转),粗纤维比例显著降低,质均纤维长度从2.29 mm降至0.76 mm。孔隙率从81.2%降至66.3%,隔膜平均孔径从1.20μm降至0.27μm,隔膜厚度从47.7μm降至26.0μm,但不同原纤化天丝隔膜制备的超级电容器的阻抗、比容量、能量密度和功率密度变化并不明显。

Tencel fibers with different degree of original fibrosis were obtained through short-cut Tencel fibers via grinding,and used to prepare fibrillated tencel separator by wet-forming process.The effect of fiber geometry size and morphology on the pore structure of separators was further investigated.Eventually,the electrochemical performance of supercapacitors prepared from separators with different pore structure was studied.The results showed that the fiber size and the pore structure of the separator changed significantly after the tencel fibers were treated with different grinding revolutions.With the increase of the grinding revolutions(20000~250000 r),the proportion of coarse fibers decreased obviously and the average fiber length decreased from 2.29 mm to 0.76 mm.Consequently,the porosity of the separator de⁃creased from 81.2%to 66.3%,the average pore size of the separator reduced from 1.20μm to 0.27μm,and the thickness of separator de⁃creased from 47.7μm to 26.0μm.Whereas the change of the impedance,specific capacity,energy and power density of supercapacitors prepared from different fibrillated tencel separator was not significant.