多孔V<sub>2</sub>O<sub>5</sub>微球的制备与电化学性能

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Abstract Porous V₂O₅ microspheres were synthesized by a facile hydrothermal reaction followed by high temperature calcination. The crystal structure of V₂O₅ microspheres was analyzed by X-ray diffraction (XRD). The morphology and microstructure were observed and analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the microspheres are single phase V₂O₅ with homogeneous porous morphology. As cathode material for lithium batteries, porous V₂O₅ microspheres electrode exhibits excellent electrochemical performance at different voltage ranges. The initial discharge capacity of the porous V₂O₅ microspheres electrode is 145 (mA·h)/g at the current density of 100 mA/g during 2.5-4 V, which is very close to the theoretical value. The capacity retention is 95.2% based on the initial capacity after 50 cycles. In addition, the electrode demonstrates excellent long-term cycling stability with the discharge specific capacity maintained at 82.8 (mA∙h)/g after 1 000 cycles at 2 A/g current density, and the average single-cycle specific capacity attenuation rate is only 0.022%. The excellent electrochemical properties of the material benefit from the three-dimensional porous microsphere structure.

Key words： Lithium-ion battery cathode material hydrothermal method porous microsphere V₂O₅ electrochemical performance

Received: 22 April 2018 Published: 12 July 2019

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TM912.9

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	Articles by authors
	CHEN RU
	FANG Guozhao
	TAN Xiaoping
	ZHOU Jiang
	Liang Shuquan

Cite this article:

CHEN RU,FANG Guozhao,TAN Xiaoping, et al. Synthesis and electrochemical performance of porous V₂O₅ microspheres[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(1): 80-88.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I1/80

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