Microwave Assisted Preparation of Zinc Cobaltite Nanoflowers and Lithium Storage Properties
Journal Title: 河南科技大学学报（自然科学版） - Year 2019, Vol 40, Issue 1
Abstract
Zinc cobaltite ( ZnCo2O4) nanoflowers were prepared by microwave assisted liquid phase method and annealing treatment. The effects of different annealing temperatures on performance of as-prepared samples were investigated. By using X-ray diffraction ( XRD) , scanning electron microscopy ( SEM) , cyclic voltammetry ( CV) , electrochemical impedance spectroscopy ( EIS) , and galvanostatic charge and discharge, the crystal structure, morphology and electrochemical performances of as-prepared materials were characterized and analyzed. The results show that spinel-structured ZnCo2O4are prepared at different annealing temperatures.With the annealing temperatures increaseing, ZnCo2O4 nanoflowers tend to aggregate. ZnCo2O4 nanoflowers annealed at 400 ℃ exhibit optimal electrochemical performances. And it can deliver 673. 5 mA •h•g-1 after50 cycles at current density of 200 mA • g-1, corresponding to the coulombic efficiency of 97. 5%, which shows a good cycling performance and high specific charge-discharge capacity.
Authors and Affiliations
Fei WANG, Yong LIU, Zhizhong WEI, Xueyang HAN, Fengzhang REN
Keywords
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- EP ID EP427025
- DOI 10.15926/j.cnki.issn1672-6871.2019.01.003
- Views 62
- Downloads 0
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