現今儲能效率和能量密度需求不斷提升，高電位的儲能元件也被研發和關注。高功率、高壽命的電雙層電容器其操作電壓主要受限於電解液成分，本研究導入聚丙烯腈(PAN)及聚偏二氟乙烯(PVDF)類的高分子型添加劑於電解液中，改善電解液在3.0 V高電位的裂解和安全性問題。
本研究的製程簡單，加入合成好的高分子添加劑配方於一般市售電解液LE中，加熱攪拌後靜置待其膠化熟成，即形成高電位電解質GPE，有3.6 V高電位窗、4.6 x 10-3的高導離子度並優異的電化學穩定性。搭配中鋼碳素ACS25電極，直接將電解液灌入cellulose商用隔離膜組成軟包型超電容元件，經電化學測試後，GPE可穩定操作於3.0 V並且有大電容量(85 F cm-3)、優異的快速充放電性能(90% cap. retention@100 A g-1)以及高循環充放電壽命(90% cap. retention@20000 cycle)。經SEM、EDX、奈米壓痕儀分析老化後的超電容電極，GPE的電極老化後狀態完整且無明顯侵蝕和破裂的痕跡，元素組成無明顯改變，力學性質也優於LE；經氣脹分析後顯示GPE有較少的裂解氣體產生，以上結果顯示其優異的穩定性和安全性。
超電容與鋰離子電池搭配的雙電系統應用在工具機或電動車等，有大功率輸出、低電阻及較長的使用壽命的效果。使用3.0 V超電容比起2.7 V超電容有更大的電流分配、更小的串聯電阻和較高的能量密度，更加提升雙電系統的效能，是未來儲能領域的一大躍進。

Electric double layer capacitors (EDLCs) is widely used in energy storage devices and promising for high power density and long cycle life. Commonly used EDLCs electrolytes can only operate below 2.7 V, which greatly suppresses the energy density of the capacitors and limits their applications. In this study, we use polyacrylonitrile-based (PAN) and Polyvinylidene fluoride-based (PVDF) polymer and mix them with the commercial electrolyte (1 M TEABF4@AN) to form gel phase electrolyte (GPE). With GPE inside, the EDLCs’ potential window increases to 3.6 V, also have higher capacitance and ionic conductivity (4.65 x 10-3 S cm-1). In cycling test or voltage-holding test (floating test) under 3.0 V, the capacitance retentions of GPE are both up to 90%, where the LE are only about 60%. Higher operated potential of GPE reaches a maximum specific energy density of 19.45 kWh L-1 and specific power density of 60.83 MW L-1.
We use SEM, EDX, nano-indenter, pressure measurement to analyze the aging level of EDLCs. GPE’s electrodes stay complete form without obvious corrosion and have lower gas products which confirm GPE’s high voltage stability. After factory test, the electrolyte GPE indeed has better electrochemical stability, which means higher capacitance retention and lower resistance increase.

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