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Aqueous Solution‐Processable Small Molecular Metal‐Chelate Complex Electrolyte for Flexible All‐Solid State Energy Storage Devices
Author(s) -
Lee Hyena,
Jeong Jaehoon,
Kim Hwajeong,
Kim Youngkyoo
Publication year - 2015
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201500402
Subject(s) - materials science , electrolyte , sulfonic acid , thin film , capacitor , chemical engineering , aqueous solution , cyclic voltammetry , inorganic chemistry , electrode , analytical chemistry (journal) , polymer chemistry , electrochemistry , nanotechnology , voltage , organic chemistry , chemistry , electrical engineering , engineering
A small molecular metal‐chelate complex, tris(8‐hydroxyquinoline‐5‐sulfonic acid) aluminum (AlQSA 3 ), 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 AlQSA 3 material is synthesized by one‐step reaction of aluminum triisopropoxide and 8‐hydroxyquinoline‐5‐sulfonic acid. The aqueous solutions of AlQSA 3 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 AlQSA 3 film reaches 0.116 mS cm −1 , while a pronounced hysteresis are obtained in the cyclic voltammetry measurement. The AlQSA 3 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 AlQSA 3 film capacitors.