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고장면,D. Soundarajan,박정훈,양승대,김상욱,김광만,유국현 한국물리학회 2012 Current Applied Physics Vol.12 No.1
a-Cobalt hydroxide is synthesized through a novel radiation-induced route using a cobalt nitrate hexahydrate isopropanol solution by irradiating 60Co g-rays. The as-prepared product shows a layerstructured mesoporous morphology with an average size of 250 nm. Crystalline property analysis exhibits the presence a-Co(OH)2 as a predominant phase with a tiny amount of secondary phases of b-Co(OH)2 and CoO. X-ray photoelectron spectroscopy discloses the existence of Co as Co(OH)2 and CoO with a stoichiometric ratio of 76.7:23.3. In addition, the supercapacitive properties of the product are investigated using cyclic voltammetry and impedance spectroscopy in 1M KOH aqueous solution,showing a maximum capacitance value of 246.7 F g-1 at a scan rate of 5 mV s-1.
Lithium-Silica nanosalts for Electrolyte Additives
고장면 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Zwitterionic lithium-silica sulfobetaine silane is fabricated by first synthesizing zwitterion sulfobetaine silane, grafting it onto hydrophilic silica to form silica sulfobetaine silane, and then lithiating the silica sulfobetaine silane. The resultant lithium-silica sulfobetaine silane additive is used as a liquid electrolyte additive in lithium-ion batteries with varying weight percentages in 1 M LiPF6 (ethylene carbonate/dimethyl carbonate = 1:1). The electrolytes with the lithium-silica sulfobetaine silane shows higher ionic conductivities and greater electrochemical stability (anodic limit at ~5.5 V vs. Li/Li<sup>+</sup>) than the pure electrolyte (anodic limit at ~4.6 V vs. Li/Li<sup>+</sup>).