期刊
ELECTROCHIMICA ACTA
卷 368, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137600
关键词
Zinc ion batteries; High areal capacity; High-rate capability Na(x)V(2)O5 center dot mH(2)O; nanobelts; Free-standing
资金
- National Natural Science Foundation of China [12074327, 12002294, 11774298]
- Science and Technology Innovation Program of Hunan Province [2020E4088]
- Scientific Research Fund of Hunan Provincial Education Department [18A064]
- Innovation Driven Project of Xiangtan University [CX 20190471]
A free-standing composite of NaxV2O5 and carbon nanotubes was fabricated and showed good storage performance, with large areal capacity, high rate, and long-term durability, suitable for aqueous zinc ion batteries.
Aqueous zinc ion batteries (ZIBs) have drawn attractive attention due to low cost and high safety. However, further development and application of the aqueous ZIBs depend on cathode materials with large capacity, high rate and cyclic performances as well as high areal capacity. Herein, free-standing composite (named as NVOcCNTs 6:4) of NaxV2O5 center dot nH(2)O (NVO) nanobelts and carbon nanotubes (CNTs) is fabricated by hydrothermal self-assembly followed vacuum filtration and freeze-drying processes. In virtue of porous and conductive architecture, the free-standing NVOcCNTs 6:4 composite exhibits good proton and Zn-2(+) storage performance. When it is used as a cathode for the aqueous ZIBs, the battery exhibits large areal capacity of 3.03 mAhcm(-2) at 3 mAcm(-2) and superior high-rate capability of 210.4 mAhg(-1) at 30 Ag-1 as well as long-term durability with capacity retention of 92.5% after 2500 cycles. Even at a high mass loading of 12 mgcm(-2), the battery can still deliver large capacity of 330.5 mAhg(-1) at 2 Ag-1. Our results disclose the NVO-based free-standing composite with high areal capacity, excellent rate and cyclic performances, highlighting its great potential application in high-performance aqueous ZIBs. (C) 2020 Elsevier Ltd. All rights reserved.
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