- 學位論文
製備聚氧化乙烯高分子固態電解液之結構與性質研究
Studies on the structures and properties of polyethylene oxide polymer solid electrolytes
摘要
固態電解液面臨最大的問題為室溫下的離子傳導率低，因此本研究著重在如何提高室溫下導電度。本研究提出一種新型固態電解液製備方法"靜電紡絲法"來製備高分子固態電解液。本研究分為兩部份，第一部份以聚氧化乙烯(Poly(ethylene Oxide)，PEO)與過氯酸鋰(Lithium perchlorate，LiClO4)以不同莫耳比例進行摻合後分別使用溶液鑄膜法和靜電紡絲法製備形成高分子固態電解液。由掃描式電子顯微鏡(SEM)觀察表面形態得知在溶液鑄膜法中隨著LiClO4的添加量的增加，平滑結構的產生與PEO結晶度的降低有關，而在靜電紡絲法中纖維結構的平均直徑約在200-600nm之間隨著鹽類添加量的增加而增加。在傅立葉紅外線轉紅外線光譜儀(FTIR-ATR)分析中得知LiClO4上的鋰離子(Li+)能與聚氧化乙烯醚基上的氧原子形成配位鍵，由熱差式掃描熱卡計(DSC)結果得知結晶度和熔點會隨著LiClO4添加量的增加而降低。由電化學阻抗圖譜(EIS)分析可得知導電度導電度隨著LiClO4添加量的增加而上升，透過溶液鑄膜法最高導電度值為5.16×10-7S/cm，靜電紡絲法則為3.94×10-5 S/cm。 第二部份為透過靜電紡絲法加入SiO2填料製備複合高分子固態電解液，由 (SEM)觀察表面形態得知纖維平均直徑隨著二氧化矽含量的添加而減少，由(DSC)結果得知結晶度和熔點會隨著SiO2添加量的增加而降低，由(EIS)分析可得知導電度隨著添加量增加而上升在7wt%時達到4.67×10-4S/cm。由線性掃描伏安(LSV)得知加入二氧化矽填料擁有較佳的化學穩定性。由溫度對導電度的變化得知三個系統都符合Arrhenius方程式。
並列摘要
The biggest problem facing solid electrolytes is the low ionic conductivity at room temperature, so this study focuses on how to increase the conductivity at room temperature. In this study, a new solid electrolyte preparation method "electrospinning method" is proposed to prepare polymer solid electrolyte. This study is divided into two parts. In the first part, poly(ethylene oxide) (PEO) and lithium perchlorate (LiClO4) are mixed in different molar ratios to prepare polymer solid Electrolyte by using Solution casting and electrospinning. Observation of the surface morphology from a scanning electron microscope (SEM) shows that in the solvent volatilization method, as the amount of LiClO4 added increases, the morphology of the smooth structure is related to the decrease in the crystallinity of PEO, while the average fiber structure in the electrospinning method The diameter increases between 200-600nm as the amount of salt added increases. In the analysis of Fourier Infrared to Infrared Spectrometer (FTIR-ATR), it is known that the lithium ion (Li+) on LiClO4 can form a coordination bond with the oxygen atom on the polyoxyethylene ether group, According to the results of thermal differential scanning calorimeter (DSC), the crystallinity and melting point will decrease with the increase of the amount of LiClO4. From the analysis of electrochemical impedance spectroscopy (EIS), the conductivity will be known as the conductivity of LiClO4. Increase while increasing, the highest conductivity quality through the solution casting is 5.16×10-7S/cm,and the electrospinning is 3.94×10-5 S/cm. The second part is to prepare a composite solid electrolyte by adding SiO2 filler through electrospinning. Observing the surface morphology by (SEM), it is known that the average fiber diameter decreases with the addition of silica content. According to the results of thermal (DSC), the crystallinity and melting point will decrease with the increase of SiO2 addition. From the (EIS) analysis, it can be known that the conductivity increases with the addition of the amount of 7wt% to 4.67×10-4S/cm. It is known from linear scanning voltammetry (LSV) that the addition of silica filler has better chemical stability. From the change of temperature to electrical conductivity, we know that the three systems are in line with the Arrhenius equation.
參考文獻
延伸閱讀
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