INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Controllable Synthesis and Electrochemical Performance of Fibrous ZnCo2O4 with Porous Structure |
ZHAN Jing, LONG Yiyu, LU Erju, LI Qihou, WANG Zhijian
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School of Metallurgy and Environment, Central South University, Changsha 410083 |
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Abstract Porous fibrous ZnCo2O4 powders were synthesized by coordination precipitation-thermal decomposition method using ZnCl2, CoCl2·6H2O and oxalic acid as raw materials, and ammonia as coordination agent and pH adjustor. The morphology and structure of ZnCo2O4 powders were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, infrared spectroscopy and N2 adsorption/desorption analysis. The effect of solution pH value on the morphology of the precursor was investigated. The electrochemical properties and the litihation/de-lithiation mechanism of the as-prepared ZnCo2O4 powders at different decomposition temperature were also tested by CHI and LAND exam system. The results indicated that generation of ammonia-containing cobalt-zinc oxalate complex salt, which results from the coordination of ammonia with cobalt and zinc ions, is the intrinsic mechanism of the formation of precursor’s fibrous morphology. The as-prepared ZnCo2O4 powders inherit the morphology of the precursor with porous fibrous structure, specific surface area of 141 m2·g-1 and average pore diameter of 8.7 nm. These favorable characteristics contribute to satisfactory cycling performance and reasonable rating performance of the resultant ZnCo2O4 powders as anode materials of lithium battery. At a current density of 100 mA·g-1, the porous fibrous ZnCo2O4 powders obtained at the decomposition temperature displayed delivered an initial capacity of 1 504 mAh·g-1 and kept the reversible specific capacity of 987.2 mAh·g-1 after 50 charge/discharge cycles with a reversible capacity retention of 96.2%. Furthermore, the material was able to remain a capacity of 565.7 mAh·g-1 at a current density as high as 500 mA·g-1.
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Published: 19 June 2019
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Fund:This work was financially supported by the National Natural Science Foundation of China (51404306), Jiana Foundation of Central South University (JNJJ201613). |
About author:: Jing Zhan, doctor of engineering, master instructor. Central South University "531" talent plan winners; members of the International Society of Minerals and Metallurgical Materials (TMS); reviewers of international journals such as Metallurgical and Materials Transactions B, Journal of Hazardous Materials, Hydrometallurgy, Electrochimica Acta. She has presided over the Ministry of Education special research fund for doctoral disciplines, the National Postdoctoral Fund, the Natural Science Foundation of Hunan Province, the Science and Techno-logy Plan of Hunan Province, and a number of horizontal cooperation projects of enterprises; participated in the National Natural Science Foundation, the National 863 Program, the National Key Research and Development Program, Hunan Province scientific and technological research and key scientific and technological achievements transformation project, Hunan Province science and technology plan key projects; published SCI, EI included more than 50 articles, authorized more than 10 patents; won the provincial and ministerial level scientific and technological invention first prize.Qihou Li, doctor of engineering, professor of Central South University, doctoral supervisor. He presided over the National Natural Science Foundation of China, participated in many projects, published more than 20 domestic and foreign periodicals, authorized more than 10 patents, and won the second prize of Hunan Science Progress. |
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