Dawson-Type Polyoxomolybdate Anions (P2Mo18O626-) Captured by Ionic Liquid on Graphene Oxide as High-Capacity Anode Material for Lithium-Ion Batteries
Dawson-Type Polyoxomolybdate Anions (P2Mo18O626-) Captured by Ionic Liquid on Graphene Oxide as High-Capacity Anode Material for Lithium-Ion Batteries
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离子液体在氧化石墨烯上捕获道森型多钼酸盐阴离子 (P2Mo18O626-) 作为锂离子电池的高容量负极材料
DOI：
10.1002/chem.201701121
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发表时间：
2017-06-27
影响因子：
4.3
通讯作者：
Song, Yu-Fei
中科院分区：
文献类型：
--
作者：
Hu, Jun;Diao, Hongling;Song, Yu-Fei
开发先进的负极材料对下一代锂离子电池（LIB）具有重要意义。本文将咪唑类离子液体通过羧基-氨基键共价接枝到氧化石墨烯（GO）表面，为Dawson型聚氧乙烯酸盐（POM）（NH 4）（6）P2 Mo 18 O 62（记为P2 Mo 18）提供了负载温床。采用FTIR和拉曼光谱、TGA、SEM、TEM和XPS等手段对所制备的GO-IL-P2 Mo 18纳米复合材料进行了表征。该纳米复合材料用作LIB的阳极材料，并且显示出903.9 mAhg（-1）的高可逆容量，具有超过1000次循环的长循环寿命。恒电流循环测试、CV测量和交流阻抗谱表明，GO-IL-P2 Mo 18纳米复合材料中的POM在锂插入/提取过程中提供了增强的比容量，并且IL提供了电解质和电极之间的有利接触。
The development of advanced anode materials is of significance for the next generation of lithium-ion batteries (LIBs). Herein, imidazolium-based ionic liquids (ILs) are grafted covalently on the surface of graphene oxides (GO) through the carboxyl-amino bond, providing a loading hotbed for the Dawson-type polyoxometalate (POM) of (NH4)(6)P2Mo18O62 (denoted as P2Mo18). The as-prepared GO-IL-P2Mo18 nanocomposite is characterized by FTIR and Raman spectroscopy, TGA, SEM, TEM, and XPS. The nanocomposite is used as the anode material for LIBs, and shows a high reversible capacity of 903.9 mAhg(-1) with a long cycle life over 1000 cycles. Galvanostatic cycling tests, CV measurements, and AC impedance spectra reveal that the POMs in the GO-IL-P2Mo18 nanocomposite give an enhanced specific capacity during the Lithium insertion/extraction process, and the IL provides a favored contact between the electrolyte and the electrode.