超级电容器隔膜制备及其孔隙率对电化学性能的影响

Preparation of Supercapacitor Separator and the Effect of Its Porosity on Electrochemical Performance

关键词:  超级电容器  隔膜  微纤化纤维  电化学性能

Key Words:supercapacitor  separator  microfiber  electrochemical performance

摘要:根据隔膜性能要求，采用低浓轻刀打浆和高浓磨浆两种方式制备微纤化纤维，对制备的隔膜进行了物理性能检验，并针对不同孔隙率隔膜制备的超级电容器进行了电化学性能分析。结果表明，与低浓轻刀打浆方式相比，高浓磨浆可以有效地保留纤维长度，提高纤维长径比，在打浆度为85°SR时，隔膜抗张强度达到0.55 kN/m，孔隙率为67%，葛尔莱透气度为41.7 μm/(Pa•s)。随着隔膜孔隙率的提高，超级电容器的比电容在0.5 A/g电流密度下逐渐增大；孔隙率为68%的隔膜制备的超级电容器循环伏安特性曲线呈明显的矩形，表现出良好的电容性能。

Abstract:In order to meet the characteristics of the fiber required for the separator preparation, fibers fibrillation could be prepared by low-consistency light beating or high-consistency refining, and the physical properties of the separator prepared were tested. The supercapacitors prepared using the separators with different porosities were subjected to electrochemical performance analysis. The results showed that compared with the low-consistency light beating method, the high-consistency refining could effectively retain the fiber length and increase the fiber aspect ratio. When the beating degree was 85°SR, the tensile strength of the separator reached 0.55 kN/m, the porosity was 67%, and the Gurley permeability value was 41.7 μm/(Pa•s). As the porosity of the separator increased, the supercapacitor had a higher specific capacitance retention at different current densities, and the cyclic volt-ampere characteristic curve also exhibited good capacitance performance.