期刊
ELECTROCHIMICA ACTA
卷 180, 期 -, 页码 451-459出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.08.142
关键词
Zinc/Nickel secondary battery; Zn-Cu-Al-hydrotalcites; electrochemical performance; cyclic voltammogram
资金
- Natural Science Foundation of China [21371180]
- Science and technology project of Changsha city [K1303015-11]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130162110018]
Zn-Cu-Al-CO3 layered double hydroxides (LDHs) have been successfully synthesized by using the method of constant pH co-precipitation. And it also has been proposed as a novel anodic material in Zinc-Nickel secondary batteries. The X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) images of the as-prepared sample exhibit that the samples are well crystallized and have hexagon structure. The electrochemical performances of Zn-Al-LDHs and Zn-Cu-Al-LDHs with different Zn/Cu/AI molar ratios are investigated by the measurements such as galvanostatic charge-discharge, cyclic voltammogram and electrochemical impedance spectroscopy (EIS). Comparing with the pure Zn-Al-LDHs, Zn-Cu-Al-LDHs show more stable cycling performance, exhibit better reversibility and display lower charge-transfer resistance. Especially, the Zn-Cu-Al-LDHs with the Zn/Cu/Al molar ratio being 2.8:0.2:1 exhibits the best electrochemical properties than other samples. After 800 cell cycles, the specific discharge capacity of Zn-Cu-Al-LDHs with the Zn/Cu/AI molar ratio of 2.8:0.2:1 is 345 mA h g(-1) while that of pure Zn-Al-LDHs is only 177 mA hg(-1). Based on these observations, the prepared Zn-Cu-Al-LDHs may be a promising anode active material for Zinc/Nickel secondary batteries. (C) 2015 Elsevier Ltd. All rights reserved.
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