Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 48, Issue 7, Pages 4240-4247Publisher
SPRINGER
DOI: 10.1007/s11664-019-07169-8
Keywords
LiMnO2; nanowires; electrochemical capacitors
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1D1A1B03032466]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MI, Korea) [10052774]
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In this work, the well-dispersed LiMnO2 nanowires of diameter 100nm 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 147Fg(-1) at 5mVs(-1), as revealed by cyclic voltammetry measurement. This was more than three times higher than that exhibited by LiMnO2 nanowires (41Fg(-1)). The cycling performance of LiMnO2 nanowires-GNP electrode revealed a capacitance retention of 86% after 1000 charge-discharge cycles at 5Ag(-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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