期刊
ELECTROCHIMICA ACTA
卷 152, 期 -, 页码 265-273出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.11.137
关键词
La-Mg-Ni-based alloy; Pr5Co19-type super-stacking structure; Secondary phase; P-C isotherm; Electrochemical property
资金
- National Natural Science Foundation of China [51171165, 21303157]
- Natural Science Foundation of Hebei Province [B2012203027, B2012203104, B2014203114]
- China Postdoctoral Science Foundation Project [2013M541201]
- Research Fund for the Doctoral Program of Higher Education of China [20131333120008]
To determine the structure and electrochemical properties of La-Mg-Ni-based Pr5Co19-type superstacking structure alloys, a La0.84Mg0.16Ni3.80 alloy was designed and synthesized by step-wise powder sintering. X-ray diffraction (XRD) analysis and Rietveld refinement show that the alloy consists of a single Pr5Co19-type phase. Electrochemical studies show that the alloy has a mediocre discharge capacity of 338 mAh g(-1) and good cycling stability. High rate dischargeability at 1500mAg(-1)(HRD1500) reaches 51.5% and the corresponding discharge capacity remains 174 mAhg(-1). To improve overall electrochemical properties of the alloy, especially the discharge capacity, Ce2Ni7-type or LaNi5 secondary phase was introduced into the single-phase alloy by adjusting molar ratio of precursors. When the content of Ce2Ni7-type phase increases from 0 to 40.6 wt.%, the maximum discharge capacity enhances from 338 to 388 mAhg(-1) and the discharge capacity retention at the 100th cycle is improved from 77.0% to 85.3%. With the presence of 20.7 wt.% LaNi5 phase in the alloy, the HRD1500 increases to 56% and the surface exchange current density (i(0)) increases from 275.50 mAg(-1) to 354.16 mAg(-1). (C) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据