Journal
JOURNAL OF POWER SOURCES
Volume 251, Issue -, Pages 344-350Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.11.071
Keywords
Layered double hydroxides; Nickel-Zinc secondary batteries; Long cycle life; High discharge capacity; High rate capability
Funding
- Natural Science Foundation of China [21371180, 91023031]
- Science and Technology Project of Changsha City [K1303015-11, K203014-11]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130162110018]
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Zn-Al-In layered double hydroxides (LDHs) are synthesized by hydrothermal method and investigated as negative electrode materials for Ni-Zn batteries. The Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show the as-prepared samples are well-crystallized and hexagon structure. The electrochemical performances of Zn-Al-LDHs and Zn-Al-In-LDHs with different Zn/Al/In molar ration are investigated by the cyclic voltammograms (CV), Tafel polarization and galvanostatic charge-discharge measurements. Zn-Al-LDHs shows good stability in the first 300-cycles. However, during the subsequent cycles, the discharge capacity decreases with increasing of the cycles. Compared with Zn-Al-LDHs, Zn-Al-In-LDHs with different Zn/Al/In molar rations, especially the sample of Zn/Al/In = 3:0.75:0.25 (molar ration) have higher discharge capacity and more stable cycling performances. This battery can undergo at least 800 charge-discharge cycles at constant current of 1C without dendrite and short circuits. The discharge capacity of Zn-Al-In-LDHs after the 800th cycle remains about 380 mAh g(-1). Zn-Al-In-LDHs possess a high rate capability to meet the needs of high-storage applications. (C) 2013 Elsevier B.V. All rights reserved.
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