輕薄化製備靜電紡絲PVDF液態膠體電解質暨碳纖維高性能儲能複合材料製程研究

Research of lightweight and high-performance energy storage composite implantation process with electrospun PVDF liquid gel electrolyte and active carbon fiber

薛宇廷(Yu-Ting Hsueh)

指導教授 ： 黃心豪

共同指導教授 ： 陳洵毅(Hsun-Yi Chen)

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202101238

摘要

本研究利用實驗室研發之局部高溫活化CNC儀器進行碳纖維的活化作業，搭配靜電紡絲奈米纖維製備之膠體電解質(gel polymer)，並最後搭配低密度聚乙烯(LDPE)及環氧樹脂(Epoxy)封裝形成輕薄化、快速製作、具可撓性及高性能之碳纖維電極儲能複合材料。透過持續真空壓力之封裝(LDPE, Epoxy)下，從阻抗分析實驗下發現內阻抗有持續下降的趨勢，功率密度由109.26提升至444.6 W/kg，而在20 mA/g之電流密度下，能量密度由884.93提升至1139.57 J/kg。
在整體製程中，係以16 wt %之PVDF溶液以2 ml/hr 之速率分別紡絲80分鐘，形成PVDF微奈米纖維後浸泡至1M之LiClO4, PC, EC型成獨立膠體電解質，並搭配局部活化700°C維持80分鐘之最佳化碳纖維以三明治疊層排列置備而成。
為了更實際貼近應用層面，本研究在電性力性同步分析上也有做深層的討論，分別為純拉伸、彎折角度測試、四點彎曲分別埋入拉、壓力側進行之同步分析。在純拉伸之循環應力0 ~ 35 MPa下，電性皆保持穩定且釋放力之後仍可以回復性能。在角度測試中可以承受至8°左右已開裂脫層導致超級電容不再受力，而電性能仍保持穩定。最後則是在四點彎曲拉壓測分別埋入超級電容進行同步分析，在拉力側可承受應變至5.73E-03，壓力側承受至-8.29E-04還不至於使得電性及力性性能毀損。

關鍵字

PVDF靜電紡絲纖維 ； 活化碳纖維 ； 多功能儲能複合材料 ； 電力性同步分析 ； LDPE與環氧樹脂封裝

並列摘要

In this study, the activation of carbon fiber was carried out by using a local high-temperature activation CNC instrument. The gel polymer electrolyte was prepared by electrostatic spinning microfiber. Finally, packaged with LDPE and Epoxy to form a thin, fast, flexible, and high-performance carbon fiber electrode energy storage composites. Under the continuous vacuum pressure packaging (LDPE, Epoxy), it was found that the internal impedance tended to decrease under the impedance analysis experiment. The power density increased from 109.26 to 444.6 W/kg, while the energy density increased from 884.93 to 1139.57 J/kg at a current density of 20 mA/g.
In the overall process, the sandwich stack arrangement of fabrication was prepared. The PVDF microfibers were spun with 16 wt% PVDF solution at a rate of 2 ml/hr for 80 minutes, and then soaked in 1M LiClO4, PC, and EC to form a gel electrolyte. The optimized carbon fiber electrodes were activated at 700°C for 80 minutes.
In order to be more practical and close to the application level, several synchronous analyses were also discussed in this study. In the pure tensile, cyclic stress was set of 0 ~ 35 MPa, and the electrical order remains stable and the performance can be recovered after the release of force. In the angular test, the supercapacitor was cracked and delaminated up to about 8°, while the electrical properties remained stable. Finally, the supercapacitor was implanted in the tensile and compressive side at four-point bending moment test for simultaneous analysis, which could withstand strains up to 5.73E-03 and -8.29E-04, respectively, without causing damage to the electrical properties.

並列關鍵字

PVDF electrospun fiber ； activated carbon fiber ； multifunctional energy storage composite ； synchronous analysis ； LDPE and epoxy implantation

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