Chemistry - A European Journal
Chemistry - A European Journal
5 years ago

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
Wenjing Luo, Hongling Diao, Jun Hu, Yu-Fei Song
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)6P2Mo18O62 (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 mAh g−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. Advanced anodes: A novel GO-IL-P2Mo18 ternary nanocomposite was prepared (see figure). The nanocomposite shows enhanced electrochemical performance with a high specific capacity of 903 mAh g−1 and long cycle life over 1000 cycles, which can be attributed to the synergistic effect of the redox-active POMs and GO-IL. This work opens a new path for the design of stable LIB anode materials.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201701121

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