Isolation of Hypervalent Group-16 Radicals and Their Application in Organic-Radical Batteries

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• 作者：Yasuyuki Imada ; Hideyuki Nakano ; Ko Furukawa ; Ryohei Kishi ; Masayoshi Nakano ; Hitoshi Maruyama ; Masaaki Nakamoto ; Akira Sekiguchi ; Masahiro Ogawa ; Toshiaki Ohta ; Yohsuke Yamamoto
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：January 20, 2016
• 年：2016
• 卷：138
• 期：2
• 页码：479-482
• 全文大小：355K
• ISSN：1520-5126

文摘

Using a newly prepared tridentate ligand, we isolated hypervalent sulfur and selenium radicals for the first time and characterized their structures. X-ray crystallography, electron spin resonance spectroscopy, and density functional theory calculations revealed a three-coordinate hypervalent structure. Utilizing the reversible redox reactions between hypervalent radicals and the corresponding anions bearing Li⁺, we developed organic radical batteries with these compounds as cathode-active materials. Furthermore, an all-radical battery, with these compounds as the cathode and a silyl radical as the anode, was developed that exhibited a practical discharge potential of ～1.8 V and stable cycle performance, demonstrating the potential of these materials for use in metal-free batteries that can replace conventional Li-ion batteries where Li is used in the metal form.