本研究利用氟化高分子PVdF-co-HFP，分別以鑄膜法以及靜電紡絲技術，製備離子電池之隔離膜。在鑄膜法部分，本研究嘗試以不同比例混合氟化高分子以及離子液體，經由SEM分析表面型態，發現離子液體的添加可增加高分子的孔洞結構；另一方面，在PVdF-co-HFP中添加交聯劑1,3-Diaminopropane(DAP)，並以鑄膜法(CF-1、CF-2、CF-3、CF-4)以及靜電紡絲法(NF-1、NF-2、NF-3、NF-4)分別製備出隔離膜，由SEM、FT-IR、TGA、DSC分析隔離膜的物理性質，以及以交流阻抗法測試纖維隔離膜的導離子度。
由SEM觀察，將PVdF-co-HFP以靜電紡絲法製備成奈米纖維隔離膜，可有效增加孔洞性有助於離子於電池中的移動，在纖維膜浸泡離子液體後，可觀察到離子液體與纖維膜的微相分離。由熱性質分析，可以發現隔離膜再加入交聯劑之後，能夠在熱性質差異不大的情況下隨著交聯劑比例的上升，有效提升隔離膜的機械性質。
在電化學性質上面，將纖維膜浸泡於溶於乙醇的離子液體的電解液中，隨著交聯劑比例的上升，電解液吸收度的下降；在交聯阻抗分析中，也顯示出交聯劑比例的上升，導離子度下降的趨勢，說明了交聯劑對PVdF-co-HFP高分子纖維膜結構的影響，然而總體來說導離子度比一般氟化高分子在鋰離子電池中低。在與鋁離子電池常用之電解液(AlCl3/[EMIm]Cl=1.3)的相容性上，因氟化高分子隔離膜會有與電解液發生化學反應的疑慮，因此推論，若要以鋰離子電池常用的氟化高分子應用於鋁離子電池，需要對高分子進行表面修飾等，以進一步提升氟化高分子在鋁離子電池的相容性。

We utilized the fluoro-based polymer, PVdF-co-HFP to prepare the separators for ion batteries by casting-film and electrospinning membrane. In the part of casting-film, we tried to mix the PVdF-co-HFP and ionic liquid with different ratios. According to the SEM analysis, it would be found that the addition of ionic liquid could increase the porous structure; on the other side, we added the cross-linker 1,3-Diaminopropane(DAP) into the solution of polymer, and then prepare the separators by the casting-film and electrospinning membrane. We tested the physical properties of our separators by SEM、FT-IR、TGA、DSC analysis, and the electrochemical properties by AC impedance analysis.
From the SEM analysis, the electrospinning membrane of PVdF-co-HFP could helpfully increase the mobility since the porous structure. It also could be observed the microphase separation after soaked in the ionic liquid. According to the TGA、DSC analysis, we found that after the addition of cross-linker, the mechanical properties promote with the increasing of the ratio of cross-linker without obvious difference of thermal properties.
In the electrochemical property analysis, the uptake of electrolyte decreased with the increasing of the ratio of cross-linker after the membrane soaked in the ionic liquid; in the AC impedance analysis, it also shows the same tendency of the ionic conductivity. It explained the influence of the cross-linker for the membrane structure, but the ionic conductivities were still lower than the PVdF-co-HFP
separators in lithium-ion batteries. As for the compatibility of aluminum-ion battery, there was a concern about the reactivity for the electrolyte which is wildly used in aluminum-ion battery. It is inferred that if we would like to apply our PVdF-co-HFP electrospinning membrane to aluminum-ion batteries, it is necessary to modify the surface structure of polymer in order to improve the compatibility of aluminum-ion battery.

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