Aqueous Solution‐Processable Small Molecular Metal‐Chelate Complex Electrolyte for Flexible All‐Solid State Energy Storage Devices |
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| Authors: | Hyena Lee Jaehoon Jeong Hwajeong Kim Youngkyoo Kim |
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| Affiliation: | 1. Organic Nanoelectronics Laboratory, School of Applied Chemical Engineering, Kyungpook National University, Daegu, South Korea;2. Priority Research Center, Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu, South Korea |
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| Abstract: | ![]()
A small molecular metal‐chelate complex, tris(8‐hydroxyquinoline‐5‐sulfonic acid) aluminum (AlQSA3), that has three sulfonic acid groups per molecule leading to an excellent solubility in water is reported as a liquid‐free perfect solid‐state electrolyte for flexible film‐type all‐solid‐state energy storage devices. The AlQSA3 material is synthesized by one‐step reaction of aluminum triisopropoxide and 8‐hydroxyquinoline‐5‐sulfonic acid. The aqueous solutions of AlQSA3 are applied to fabricate flexible film‐type all‐solid state electric double layer capacitors with indium‐tin oxide thin film electrodes. The ion conductivity of the AlQSA3 film reaches 0.116 mS cm?1, while a pronounced hysteresis are obtained in the cyclic voltammetry measurement. The AlQSA3 film capacitors exhibit an output voltage of 1.5 V at 20 μA cm?2, which is considerably stable by the repeated operation. In particular, the peak output voltage is well kept even after 180° bending for 500 times in the case of the flexible AlQSA3 film capacitors. |
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| Keywords: | all‐solid‐state devices aqueous solutions energy storage flexible devices solid electrolytes |
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