目前生活中常見的鋰離子電池，由於成本高、安全性備受質疑，近幾年來有相當多的文獻試圖找尋解決辦法。成本高是因為鋰在地表上的含量非常稀少，所以物性相近、含量多且在電解質中離子移動能力優秀的鉀成為本研究的選擇。安全性問題則是因為液態電解質具有漏液、易燃的可能性，且無法阻擋樹枝狀結晶的產生，固態電解質可直接避免這些問題，因此便受到了相當程度的關注。

金屬有機骨架(MOFs)由於其規律的孔道、多數具不導電的性質，以及可依實驗需求用各種配體修飾的特性，在近十年來成為了固態電解質常運用的材料。本研究藉由溶劑輔助配體結合法(SALI)將4-磺基酸單鉀鹽固定在以鋯為基底的金屬有機骨架MOF-808當中，並加入碳酸丙烯酯使金屬有機骨架內的孔道充滿著液態電解質，形成陰離子固定在鋯節點上，鉀離子則能在孔道中進行移動的結構。由實驗結果可知，比較其他文獻的固態電解質，此種結構能帶來相同範圍的導離度、相對低的活化能，以及特別高的鉀離子遷移數，並且具有相當好的長時間穩定性。

In this study, the 4-sulfobenzoic acid potassium salt is post-synthetically immobilized on the hexa-zirconium nodes of a zirconium-based MOF, MOF-808, by the solution-phase solvent-assisted ligand incorporation approach. With all the sulfonate-based anions firmly immobilized within the rigid framework of MOF-808 along with mobile potassium ions presented in the resulting material (MOF-808-SO3K), the MOF-808-SO3K-based solid-state electrolyte achieves an ionic conductivity of 3.1 × 10−5 S/cm at 303 K, a low activation energy of 0.32 eV, and an ultrahigh transference number of 0.95 for potassium ions. The long-term stability of MOF-808-SO3K during the charge-discharge processes with the potassium metal is also investigated.

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