期刊
ELECTRONIC MATERIALS LETTERS
卷 18, 期 1, 页码 47-56出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s13391-021-00321-9
关键词
Sodium ion batteries; Cathode materials; Vanadium oxide nanotubes; Graphene composite
资金
- National Natural Science Foundation of China [51872204, 52072261, 22011540379]
- National Key Research and Development Program of China [2017YFA0204600]
- Shanghai Social Development Science and Technology Project [20dz1201800]
By using the ex-situ composite method, graphene-coated vanadium oxide nanotubes were successfully prepared, showing improved stability and alleviation of volume changes during charge and discharge processes. The experimental results demonstrated that VNT/rGO exhibited a higher capacity retention rate.
Using the ex-situ composite method, we have prepared grapheme coating vanadium oxide nanotubes (VNT) by using vanadium oxide nanotubes, cationic surfactant cetyltrimethylammonium bromide (CTAB) and graphene oxide (GO) aqueous solution. The surface of the vanadium oxide nanotube was modified by CTAB, so that vanadium oxide nanotubes were combined with graphene oxide via electrostatic interaction. The introduction of graphene provides an effective protective layer for vanadium oxide nanotubes, alleviates the volume change caused by sodium ion insertion and extraction during charge and discharge process, and enhances the stability of vanadium oxide nanotube structure. The electrochemical test show that the capacity retention of VNTs after 50 cycles was only 18%, while the capacity retention rate of VNTs/rGO was as high as 74%. In addition, we made a detailed analysis of the morphology, structure and formation mechanism of the materials. [GRAPHICS] .
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