Rechargeable Lithium-Iodine Batteries with Iodine/Nanoporous Carbon Cathode

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• 作者：Qing Zhao ; Yanying Lu ; Zhiqiang Zhu ; Zhanliang Tao ; Jun Chen
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：September 9, 2015
• 年：2015
• 卷：15
• 期：9
• 页码：5982-5987
• 全文大小：480K
• ISSN：1530-6992

文摘

Rechargeable Li-iodine batteries are attractive electrochemical energy storage systems because iodine cathode provides the possibility of high energy density, wide abundance and low cost. However, the safety risk caused by low thermostability of iodine and the self-discharge reaction due to high solvency of iodine in aprotic solvent are target issues to be considered. Herein, we designed a room-temperature 鈥渟olution-adsorption鈥?method to prepare a thermostable iodine鈥揷arbon cathode by utilizing the strong adsorption of nanoporous carbon. Meanwhile, Li-iodine batteries constructed by the as-prepared cathode and ether-based electrolyte with the addition of LiNO₃ showed negligible self-discharge reaction, high rate and long cycling performance. The reversible reactions of I₂/LiI₃ and LiI₃/LiI in Li-iodine batteries were also proved with in situ Raman measurement. For the demonstration of application, soft-package batteries with Al-plastic film were assembled, displaying energy densities of 475 Wh/kg by mass of Li and iodine, and 136 Wh/kg by total mass of the battery. The use of nanoporous carbon to adsorb iodine at room-temperature represents a new and promising direction for realizing high-performance cathode for rechargeable Li-iodine batteries.