文献类型：期刊文献

英文题名：An Iodine Quantum Dots Based Rechargeable Sodium-Iodine Battery

作者：Gong, Decai[1];Wang, Bin[1,2];Zhu, Jingyi[3,4];Podila, Ramakrishna[3,4];Rao, Apparao M.[3,4];Yu, Xinzhi[1];Xu, Zhi[1];Lu, Bingan[1]

第一作者：Gong, Decai

通讯作者：Lu, BG[1]

机构：[1]Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China;[2]Xinxiang Univ, Phys & Elect Engn Dept, Xinxiang 453003, Peoples R China;[3]Clemson Univ, Dept Phys & Astron, Clemson Nanomat Ctr, Clemson, SC 29634 USA;[4]Clemson Univ, COMSET, Clemson, SC 29634 USA

第一机构：Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China

通讯机构：[1]corresponding author), Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China.

年份：2017

卷号：7

期号：3

外文期刊名：ADVANCED ENERGY MATERIALS

收录：;EI(收录号：20165103144580);Scopus(收录号：2-s2.0-85005921804);WOS:【SCI-EXPANDED(收录号:WOS:000394940100018)】；

基金：D.G. and B.W. contributed equally to this work. This work was financially supported by the National Natural Science Foundation of China (No. 21303046 and 21473052), the Natural Science Foundation of Hunan Provinces (No. 201324), the Research Fund for the Doctoral Program of Higher Education (No. 20130161120014) and Hunan University Young Scientists fund.

语种：英文

外文关键词：full-cells; graphene; in situ Raman spectroscopy; iodine quantum dots; sodium-iodine batteries

摘要：Rechargeable sodium-iodine batteries represent a promising scalable electrochemical energy storage alternative as sodium and iodine are both low cost and widely abundant elements. Here, the authors demonstrate a rechargeable sodium-iodine battery that employs free-standing iodine quantum dots (IQDs) decorated reduced graphene oxide (IQDs@RGO) as the cathode. Consistent with the density functional theory the authors find the Na+ ions to intercalate into the I unit cell forming stable NaI, and the battery exhibits high capacity, outstanding cycle stability (with a reversible specific capacity of 141 mA h g(-1) after 500 cycles at current density of 100 mA g(-1)), and high rate performance (170, 146, 127, 112, and 95 mA h g(-1) at current densities of 100, 200, 400, 600, and 1000 mA g(-1), respectively). The reversible reactions, I-2/I-3(-) and I-3(-)/I- redox couples on insertion of Na+ ions, are confirmed via in situ Raman spectroscopy. Notably, even after 500 cycles the morphology and structure of the IQDs exhibit no noticeable change implying their use as a stable cathode material for sodium-iodine batteries. Moreover, the IQDs based flexible full-cells also exhibit high capacity and long cycle life (the capacity with 123 mA h g(-1) at current density of 100 mA g(-1) after 100 cycles).