本研究利用電紡絲技術製備出多孔性聚乙二醇（poly(ethylene oxide), PEO）高分子纖維薄膜，並將PEO-based預聚體在未聚合前塗佈在鋰金屬表面上，依序放上PEO高分子薄膜與正極，由於纖維薄膜具有多孔性且較薄，因此預聚體能夠滲透入薄膜並浸潤正極表面，加熱聚合後即可製備出全固態鋰電池。由掃描式電子顯微鏡分析可觀察到，PEO-based高分子能夠連續且均勻地填補薄膜的空隙，而所製備的電解質整體厚度小於40 µm。此外，電極表面能夠與電解質緊密貼合，因此界面阻抗約100Ω，電化學穩定電位窗可達5.5 V，具有良好的電化學可逆性。其離子傳導度在60 oC下可達10–4 Scm－1，電池效能在充放電速率0.1C時可達150 mAhg－1，而在高充放電速率7C時仍保有電容25 mAhg－1。然而此電解質面臨到的問題是低機械性質，導致無法有效抑制鋰枝晶生成的影響，而有潛在的短路問題。分別把不同材料的電紡纖維膜應用在PEO-based固態高分子電解質中，比較其對鋰電池效能的影響。結果顯示電紡薄膜必須具離子傳導性，且與PEO-based高分子有相容性，才可獲得較佳的固態電解質電池效能。為了改善PEO固態電解質潛在的短路問題，進一步加入聚偏二氟乙烯（polyvinylidene difluoride, PVDF）製備出PVDF/PEO混合高分子電紡纖維薄膜，應用在PEO-based的固態電解質中。由結果可知，雖然電池充放電效能有下降的趨勢，但在充放電速率0.1C時仍可達150 mAhg–1，充放電速率1C時的電容值也高於120 mAhg–1。此外，由於機械性質的提升，因此有良好抑制鋰枝晶影響的能力，而可提升電池的安全性。

In this study, a porous poly(ethylene oxide) (PEO) fiber film was prepared by electrospinning technology. Additionally, PEO-based precursor was coated on the surface of lithium metal anode, followed by putting the PEO film and the cathode in order. The PEO-based precursor would permeate into the nanofiber film and cathode. PEO-based precursor could provide a continuous network of Li ions in electrolyte and between electrode and electrolyte. After heating, the all-solid-state lithium batteries were fabricated by thermal polymerization.
The SEM analysis shows that the PEO-based polymer could uniformly fill the gaps in the film, and the overall thickness of the electrolyte is less than 40 µm. In addition, the well interfacial contact between cathode and electrolyte is the main reason to result in the low interfacial resistance (100Ω). The solid-state electrolytes exhibit good electrochemical stability (onset potential ~5.5V) and good ionic conductivity (10-4 Scm-1 at 60oC). Besides, the capacity of the electrolyte prepared by electrospinning is up to 150 mAh/g under 0.1C at 60℃. The capacity of the electrolyte at the high discharge current (7C) still keeps at 25 mAh/g. However, there is a potential problem with a short circuit due to poor mechanical property.
In order to improve mechanical property, PEO/PVDF polymer electrospun membranes were prepared by mixing PEO and polyvinylidene difluoride (PVDF) to be applied as the PEO-based all-solid-state electrolyte. From the result of plating-stripping test, a good ability to limit the growth of lithium dendrite was found.
All the above-mentioned properties demonstrate that the thin electrolyte membrane could be prepared by an electrospun approach and all-solid-state electrolyte with low interfacial resistance is successfully fabricated by coating PEO-based precursor on the lithium metal.

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