期刊
JOURNAL OF ENERGY CHEMISTRY
卷 51, 期 -, 页码 388-395出版社
ELSEVIER
DOI: 10.1016/j.jechem.2020.03.053
关键词
V2O5; Cathode; Reed carbon; Microporous; Lithium-ion batteries
资金
- National Natural Science Foundation of China [51922038, 51672078]
- Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Independent Research Project [71675004]
- Hunan Youth Talents [2016RS3025]
- Hunan Natural Science Foundation [2016JJ3123]
To search for new cathode materials with high energy density of Lithium-ion batteries (LIBs) is one of the most challenging issues. Vanadium pentoxide (V2O5) with high theoretical specific capacity is believed to be a promising candidate for the next generation cathode materials, yet still suffers from low lithium ion diffusion coefficient and poor electronic conductivity resulting in low cycling life and poor rate performances. Here, we report new large-scale carambola-like V2O5 nanoflowers arrays anchored on microporous reed carbon as high performances LIBs cathode. Each individual pore space of the microporous reed carbon is like a hexagonal cylinder, and the area of each carbon wall is more than 10(3) um(2), which is favorable for the growth of V2O5 nanostructure arrays. After hydrothermal, the largescale carambola-like V2O5 nanoflowers arrays can directly grow on the surface of microporous carbon. Due to the novel composite structures, the V2O5 nanoflowers arrays@microporous carbon stabilizes at 273 mA h g(-1) after 100 cycles at 0.2 C. When cycling at 1.0 C over 500 cycles, the capacity still maintains at 180 mAh g(-1). The demonstrated approach in this work paves the way for the development of high rate capability and excellent cycling stability V2O5-based cathode materials. (c) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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