本研究合成兩種寡聚物，分別為鋰單離子型寡聚物及非離子型寡聚物並作為固態電解質之塑化劑。本實驗利用三明治結構之固態電解質，由液態醚基電解質前驅物(Precursor)塗佈於聚氧乙烯離子傳導膜兩側後加以聚合，利用液態電解質前驅物解決固態電池界面接觸性不佳的問題，並透過合成之寡聚物提升電解質前驅物之離子傳導度。
由熱重分析觀察到電解質前驅物中添加非/單離子寡聚物後，其裂解溫度從351°C上升至390°C說明兩者間彼此有作用力產生，使熱裂解溫度升高。電化學穩定電位窗達4.4V。在60°C下，藉由在液態醚基電解質前驅物中加入非單離子寡聚物和鋰單離子寡聚物其傳導度分別為6.88×10-5S/cm和8.80×10-5S/cm，並在充放電效能測試下，1C放電電容值分別為81mAh/g、110mAh/g，說明導入鋰單離子寡聚物有較佳的效能。在循環壽命以及循環阻抗測試中，導入非單離子寡聚物之庫倫效率不僅不佳就連阻抗值也隨著圈數持續增加，相較之下導入鋰單離子寡聚物不只能夠維持99.7%之庫倫效率，循環阻抗也在20圈後穩定不再增長，此外在循環壽命測試後觀察到鋰金屬表面較為平整，推測形成穩定SEI層。因為鋰金屬會自發性和寡聚物產生反應而形成鈍化層，在循環伏安法添加非單離子寡聚物在高電位下鈍化層會氧化產生不穩定電流，而添加單離子寡聚物所形成的鈍化層則較為穩定。並由FT-IR分析初始在表面所自發生成的鈍化層中組成成分多了鋰單離子官能基的訊號而讓鈍化層穩定，因此有較佳的循環壽命。混摻鋰單離子寡聚物除了提升電解質前驅物本身傳導度外，同時能夠濕潤多孔性正極材料提升電容，另一方面能夠在負極和鋰金屬自發生成native film保護層，增加循環壽命，提升電池整體之性能。

In this study, we synthesize two types of oligomer containing single-ion and non-ionic, polyether-based, ion-conducting moiety as plasticizer for solid-state battery (SSB). The SSB features a sandwich-structured solid-state electrolyte of which liquid-like precursor is coated on the both sides of PEO membrane before polymerization. The precursor can effectively fill the void space, which reduces the interfacial resistance of SSB.
To further improve the ionic conductivity of electrolytes, we introduce single-ion and polyether-based ion-conducting oligomer in the precursor of sandwich-structured electrolyte. The former exhibits higher ionic conductivity (8.8×10-5 S/cm)and better discharge capacity at 1C (110 mAh/g) than the latter at 60°C. Also, the former exhibits a good coulombic efficiency (> 99 %) during cycling, the cycle resistance remains unchanged after 20cycle, and the surface of lithium metal after cycling is smooth which are better than the latter one. Lithium metal reacts with oligomer leading a native film, spontaneously. From CV and FT-IR analysis, the single ion conducting oligomer exhibits stable native film which keeps electrochemical inert during charge/discharge process, while polyether-based oligomer does not. These results suggest the single ion segment acts as a key role to enhance the cyclic stability of the interface between lithium and electrolytes, which is important for next generation solid-state battery application.

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