首页|取向增强抗CO2腐蚀纤维薄膜的制备及其性能

取向增强抗CO2腐蚀纤维薄膜的制备及其性能

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针对柔性金属空气电池阴极腐蚀问题,采用静电纺丝技术在不同滚筒转速条件下制备了 4 组聚乙烯亚胺(PEI)/聚丙烯腈(PAN)复合纤维薄膜.采用傅里叶变换红外光谱仪、X射线衍射仪、扫描电子显微镜、比表面积和孔径分析仪、同步热分析仪和柔性电子器件综合测试平台等对复合纤维薄膜的物理特性、CO2 吸附性能及力学性能进行表征.结果表明:静电纺丝制备的PEI/PAN复合纤维薄膜的纤维表面较粗糙,存在沟壑、褶皱和微孔等形貌结构;当接收滚筒转速在 1 500 r/min时,PEI/PAN复合纤维薄膜中纤维排列较规整,结晶度高,取向性显著;相比接收滚筒转速为 500 r/min时制备的随机取向的纤维薄膜,接收滚筒转速为 1 500r/m时制备的高取向纤维薄膜的比表面积增大了 82.29%,CO2 吸附性能提升了 62.06%,纵向拉伸断裂强度增强了 178.57%.本研究通过取向增强获得了兼具抗CO2 腐蚀性能和优异力学性能的静电纺丝柔性金属空气电池阴极隔膜,为柔性金属空气电池阴极抗CO2 腐蚀薄膜的制备工艺方法提供参考.
Preparation and properties of orientation reinforced CO2 corrosion resistant fiber membrane
Objective CO2 corrosion of the cathode in flexible metal-air batteries severely reduces its electrochemical performance and greatly hinders the further development of flexible metal-air batteries.Existing research shows that the amino functional group in PEI has strong adsorption capacity for CO2.By increasing the orientation of the fiber membrane,the specific surface area and pore volume of the fiber membrane can be increased,thereby enhancing the adsorption capacity of the fiber membrane.A high degree of orientation can also enhance the mechanical properties of the membrane to a certain extent.However,there are few studies on cathode separators for flexible metal-air batteries offering both excellent CO2 adsorption capacity and good mechanical properties.As such,this study aims to use electrospinning technology to prepare highly oriented Polyethyleneimine(PEI)/polyacryloni-trile(PAN)composite fiber membrane by adjusting the drum speed,and to characterize its physical properties,mechanical properties and CO2 adsorption properties.Method Four different groups of PEI/PAN composite fiber membranes were prepared at the drum rotation speeds of 500,1 000,1 500 and 2 000 r/min respectively.Fourier transform infrared spectroscopy,X-ray diffractometer,Scanning electron microscopy,and a flexible electronic comprehensive test platform were used to characterize the physical properties and mechanical properties of the composite fiber membranes.The CO2 adsorption performance of the composite fiber membranes was characterized by a specific surface area and pore size analyzer and a simultaneous thermal analyzer,and the influence of orientation on the CO2 adsorption capacity and mechanical properties of the PEI/PAN composite fiber membrane was explored.Results The results of infrared spectroscopy and scanning electron microscopy show that the PEI/PAN composite fiber membrane was successfully prepared by electrospinning,and as the drum speed increases,the fiber diameter decreases.The rotation speed of the drum greatly affected the orientation of the fibers.When the rotation speed was 1 500 r/min,the orientation of the fibers seemed the best.The high degree of orientation obtained by increasing the rotation speed of the drum can obtain a larger specific surface area and pore volume of the PEI/PAN composite fiber membrane,thus improving its ability to adsorb CO2.This is mainly due to the smaller fiber diameter and the larger gap formed by fiber stacking between the non-oriented and oriented directions.The increase in fiber orientation also enhances the crystallinity of fibers,which greatly affects their mechanical properties.High orientation caused increase the tensile breaking strength and Young's modulus of the fibers in the longitudinal direction.This is mainly because the nanofibers arew able to withstand greater tensile stress when they are aligned.Conclusion The PEI/PAN composite fiber membrane prepared by electrospinning at 1 500 r/min has excellent orientation.Compared with the randomly oriented composite fiber membrane prepared by electrospinning at 500 r/min,the CO2 adsorption capacity of the prepared membrane is increased by 62.06%,the longitudinal tensile breaking strength is enhanced by 178.57%,and the Young's modulus is enhanced by 245.3%.The research reported in this article provides a reference for the preparation of cathode anti-CO2 corrosion membranes for flexible metal-air batteries.

oriented nanofiber membraneelectrospinningCO2 adsorptionmechanical propertybattery diaphragm material

卢海龙、于影、左雨欣、王浩然、陈洪立、汝欣

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浙江理工大学 机械工程学院,浙江 杭州 310018

嘉兴大学 信息科学与工程学院,浙江 嘉兴 314001

嘉兴南湖学院,浙江 嘉兴 314001

取向纳米纤维膜 静电纺丝 CO2吸附 力学性能 电池隔膜材料

2024

纺织学报
中国纺织工程学会

纺织学报

CSTPCD北大核心
影响因子:0.699
ISSN:0253-9721
年,卷(期):2024.45(12)