Parametric study of hydrothermal soft chemical synthesis and application of Na 0.44 MnO 2 nanorods for Li-ion battery cathode materials: Synthesis conditions and electrochemical performance
| Autor: | Qiu-hong Wang, Wen-li Guo, Cai Liu, Xiaoping Yang, Jian-gang Li |
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| Rok vydání: | 2016 |
| Předmět: |
Battery (electricity)
Materials science Mechanical Engineering Metals and Alloys Nanotechnology 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode Hydrothermal circulation Lithium-ion battery 0104 chemical sciences law.invention Chemical engineering Mechanics of Materials law Phase (matter) Materials Chemistry Nanorod 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 658:588-594 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2015.10.243 |
| Popis: | In this paper, synthesis parameters were thoroughly investigated to understand and optimize the hydrothermal soft chemical synthesis of Na 0.44 MnO 2 nanorods. Structural characterization reveals that a layered Na-birnessite precursor, a high NaOH concentration (15.0 mol/L) and a high hydrothermal reaction temperature (180 °C) are required for rapid formation of the tunnel Na 0.44 MnO 2 phase. Additionally, the hydrothermal reaction time is greatly reduced to 8 h. More significantly, from electrochemical testing it is observed that the cycling stability and rate capability of Na 0.44 MnO 2 electrode materials are enhanced after the addition of carbon nanotubes. The capacity retention increases from 70% to 82% at 0.1 A/g after 50 cycles, and the Li storage capacity at a high rate of 2.0 A/g increases from 45 mAh/g to 99 mAh/g. The parameters are optimized for fast, high-yield and large-scale production of high performance Na 0.44 MnO 2 nanorod cathode materials used in lithium-ion batteries. |
| Databáze: | OpenAIRE |
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