期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 10, 页码 3563-3570出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14486k
关键词
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资金
- National Nature Science Foundation of China [21301193, 51304077]
- China Postdoctoral Science Foundation [2013M530356]
- Hunan Provincial Natural Science Foundation of China [13JJ4100]
- Fundamental Research Funds for the Central Universities of Central South University
- Open-End Fund for Valuable and Precision Instruments of Central South University [CSUZC201303]
In this work, NaV3O8 nanowires are proposed as a novel cathode for a Na-ion battery for the first time. The as-prepared nanowires are characterized well by X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectra, thermogravimetry (TG), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Sodium insertion/extraction properties of as-prepared nanowires with or without thermal treatment are compared. It is found that thermal treatment could remove some crystal water in the host, resulting in a contracted crystal volume. In comparison with the untreated sample, although the reversible discharge capacity of annealed NaV3O8 center dot xH(2)O nanowires is decreased from 169.6 mA h g(-1) to 145.8 mA h g(-1) when cycled at 10 mA g(-1), it shows good capacity retention of ca. 91.1% after 50 cycles, much higher than that (51.9%) of the untreated sample. Annealed NaV3O8 nanowires exhibit much better cycling stability and charge-discharge plateaus during the Na-ion insertion/extraction processes, which should be attributed to the contracted crystal volume and the increased crystallinity.
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