Abstract
In this work, the well-dispersed LiMnO2 nanowires of diameter 100 nm were successfully prepared via a simple one-pot hydrothermal method. The morphology of the nanowires during their growth was dependent on the reaction time. The LiMnO2 nanowires were possibly formed by a nucleation and regrowth process. The LiMnO2 nanowires-graphene nanoplatelets (LiMnO2 nanowires-GNP) composite was then prepared by the direct milling of one-dimensional LiMnO2 nanowires and two-dimensional GNP. The LiMnO2 nanowires-GNP composite was employed as an electrode material to investigate its electrochemical performance. The LiMnO2 nanowires-GNP composite exhibited an outstanding mass-specific capacitance of 147 F g−1 at 5 mV s−1, as revealed by cyclic voltammetry measurement. This was more than three times higher than that exhibited by LiMnO2 nanowires (41 F g−1). The cycling performance of LiMnO2 nanowires-GNP electrode revealed a capacitance retention of 86% after 1000 charge–discharge cycles at 5 A g−1, which was superior to that exhibited by the LiMnO2 nanowires. Besides, the resistance of the LiMnO2 nanowires-GNP was lower than that of LiMnO2 nanowires, demonstrating that these hybrids could be considered as next generation electrode materials for electrochemical energy storage and conversion devices.
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Acknowledgments
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1D1A1B03032466). This work was supported by the Technology Innovation Program (10052774, Development of hybrid supercapacitor by nano structure carbon for ISG Applications) funded by the Ministry of Trade, Industry & Energy (MI, Korea).
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Chen, T., Bae, J. Facile One-Pot Synthesis of LiMnO2 Nanowire-Graphene Nanoplatelet Composites and Their Applications in Battery-Like Electrodes for High Performance Electrochemical Capacitors. J. Electron. Mater. 48, 4240–4247 (2019). https://doi.org/10.1007/s11664-019-07169-8
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DOI: https://doi.org/10.1007/s11664-019-07169-8