期刊
JOURNAL OF POWER SOURCES
卷 256, 期 -, 页码 145-152出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.01.026
关键词
Preferred orientation; Flow battery; Impedance spectroscopy (EIS); Zinc morphology; X-ray diffraction (XRD)
资金
- Department of Energy (ARPA-E grant) [DE-AR0000150]
- National Science Foundation (NSF) [1031820]
Preferred orientation of zinc deposits during charging is shown to significantly improve performance and cycle life in flow-assisted alkaline zinc batteries, which has not been demonstrated earlier. The preferred orientation of zinc deposits was investigated using X-ray diffraction (XRD). Compact zinc is found to have (11 (2) over bar2) preferred orientation on brass, which contributes to similar to 60% of the texture. The effect of charging current and zincate concentration on morphology was investigated in a rotating hull cell and correlated with anodic efficiency. Compact zinc deposits are found to have a fine-grained, bright finish and the highest anodic efficiency. Electrochemical impedance spectroscopy (EIS) proves that compact zinc corresponds to the minimum in the half-cell resistance. Morphological control using compact zinc could be accomplished using innovations such as pulse charging or enhanced mass-transfer to improve anode performance without affecting the cathode. (C) 2014 Elsevier B.V. All rights reserved.
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