本研究利用(1) 紫外光聚合丙烯酸酯類高分子，並導入共熔鹽溶液中，
形成複合電解質以應用於鋰電池；(2) 應用田口實驗設計法以有效率地在
不同製作條件下，找出最佳組成，大幅減少實驗次數和時間、資源消耗，
例如，最佳組成的磷酸鋰鐵半電池 CPE-1 充放電表現，在 0.2C 充放電速
率下，可循環 174 圈以上，電容量維持率達 97 %，同時室溫下導離子度
為 0.33 mS·cm-1，電化學窗口則介於 0.7 至 4.5 V (vs. Li/Li+
)，並可搭配高電位正極，如鎳鈷錳酸鋰三元正極材料，以提升整體能量密度。
本研究藉由 7Li Solid-State NMR 發現壓克力高分子的氧原子無法與鋰
離子產生配位，只能借助高分子鏈段擺動以傳遞鋰離子，整體導離子度符
合 Arrhenius 方程式描述；拉曼光譜則顯示雙三氟甲烷磺醯亞胺陰離子
(TFSI-)可能與壓克力骨架具有交互作用力，使 TFSI- 於電解質中會以順
式構像存在，這也說明丙烯酸酯類的高分子與 L1M4 電解液相容性高的
現象。本研究也以電化學分析探討共熔鹽電解質衰退原理，發現其主因為
於電解質與鋰金屬之間的界面反應所致，在施加電流下，則會加速沉積與
剝離，造成不穩定固態電解質界面(SEI)滋長且阻抗持續增加，使鋰離子
傳遞效率下降造成電容量及庫倫效率遞減。熱穩定性分析則顯示在一般
的操作溫度下，本電解質未出現相轉變與明顯的重量變化，能夠順利運作。

This study describes a new type of composite polymeric electrolytes (CPEs) for lithium battery. We integrate acrylate crosslinked backbone into deep eutectic solvent (DES) based on lithium bis[(trifluoromethyl)sulfonyl] imide (LiTFSI) and N-methylacetamide (MAc) in 1:4 molar ratio. The CPEs are synthesized via UV curing of butyl acrylate (BA), 1,6-Hexanediol diacrylate (HDDA) and Trimethylolpropane triacrylate (TMPTA) monomers in situ within DES. To balance mechanical properties and ionic conductivity, we employ Taguchi method to optimize the proportion of CPEs. The analyses of the result show thatTMPTA is a significant factor and successfully predict the best component CPE-1. The CPE-1 possesses a wide electrochemical window (0.7-4.5 V vs. Li/Li+) and a high ionic conductivity (0.33 mS cm-2) at room temperature. When applied in LiFePO4/Li coin cell, the CPE-1 enable high coulombic efficiency and 174 cycles at 0.2C with 97% specific capacity retention.

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