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.
作者简介: 湛菁,工学博士,硕士研究生导师。中南大学“531”人才计划入选者;国际矿物、冶金材料学会(TMS)会员;Metallurgical and Materials Transactions B、Journal of Hazardous Materials、Hydrometallurgy、Electrochi-mica Acta等国际期刊审稿人。主持教育部博士学科专项科研基金、国家博士后基金、湖南省自然科学基金、湖南省科技计划项目,以及一批企业横向合作项目等;参与了国家自然科学基金、国家863计划、国家重点研发计划、湖南省科技攻关与重大科技成果转化项目、湖南省科技计划重点项目等;发表SCI、EI收录文章50余篇,授权专利10余项;获省部级科技发明一等奖1项。李启厚,工学博士,中南大学教授,博士生导师。主持国家自然科学基金面上项目一次,参与多次,发表国内外期刊20余篇,授权专利10余项,获得湖南省科学进步二等奖一次。
引用本文:
湛 菁, 龙怡宇, 陆二聚, 李启厚, 王志坚. 纤维状多孔钴酸锌的可控制备及电化学性能[J]. 材料导报, 2019, 33(14): 2287-2292.
ZHAN Jing, LONG Yiyu, LU Erju, LI Qihou, WANG Zhijian. Controllable Synthesis and Electrochemical Performance of Fibrous ZnCo2O4 with Porous Structure. Materials Reports, 2019, 33(14): 2287-2292.
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2019, Vol. 33 
