本實驗利用臭氧合成法(Ozone-induced polymerization)，將聚醚高分子鏈段接枝於聚偏氟乙烯(PVDF)主鏈上，此聚偏氟乙烯接枝聚醚高分子於本研究中稱為mPVDF，並與寡聚物及鋰鹽混摻，製備成固態高分子電解質。經由核磁共振光譜與傅立葉轉換紅外線光譜儀證實將聚醚高分子成功接枝於聚偏氟乙烯；藉由微差式掃描熱卡計分析得知寡聚物擁有塑化劑功能，可有效降低整體固態電解質Tg溫度；由熱重分析可發現聚醚高分子與寡聚物之間具有良好的相容性。電化學性質方面，改質之固態高分子電解質之離子傳導度在30℃~80℃下可達1×10-3 S/cm以上；電化學穩定電位窗可達4.7V；對稱鋰金屬電池靜置儲存七天介面阻抗變化為153Ω且長效充放電電壓變化穩定；鋰金屬電池於不同充放電速率下(0.1C~5C)具有良好之電容值，分別在室溫與60℃下1C可達93 mAh/g與148 mAh/g；而循環長效壽命經過100圈0.5C充放電下，也接近99.9%之庫倫效率值；經由SEM分析經過充放電之鋰金屬發現，改質之固態高分子電解質之鋰金屬表面鈍化層平整。此研究之固態高分子電解質具有上述之良好特性，將其應用在鋰金屬電池中，能進一步提升電池安全性。

Synthesis of a modified polyvinylidene fluoride polymer grafted polyether via ozone-induced polymerization has been characterized with 1H-NMR and FTIR. We used this modified polymer as main matrix for solid polymer electrolyte (SPE) system, which was blended with oligomers, poly(ethylene glycol) dimethyl ether (PEGDME), and lithium salts. After mixed with the oligomers and lithium salt, the SPE_mF70 exhibit high ionic conductivity (1.01×10−3 S/cm at 30℃) and excellent electrochemical performance. Comparing with commercial polyvinylidene fluoride, the modified PVDF-based SPE possessed polyethylene oxide chains could improve the specific capacity of 146 mAhg-1 under a discharging current density of 1 C at 60℃ and 147 mAhg-1 under 0.5 C at ambient temperature, implying that the polyethylene oxide chains grafted on the modified PVDF could enhance conductivity of lithium ions. Also, the great compatibility between oligomers and polyether chains will reduce the lithium dendrite growth and improve the electrode/electrolytes interface. The presented results make it as potential promising material for solid polymer electrolytes applied on lithium ion battery.

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