Journal
ELECTROCHIMICA ACTA
Volume 173, Issue -, Pages 200-208Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.05.049
Keywords
Ni/MH secondary battery; Phase transformation; Pr2MgNi9; Solid solubility; Electrochemical Property
Categories
Funding
- 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]
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In this paper, via adjusting Mg content in Pr3-xMgxNi9 (x = 0.45-1.2) alloys, a PuNi3-type single-phase Pr2MgNi9 alloy was obtained by powder-sintering method. The solid solubility of Mg in PuNi3-type phase and phase transformation of Pr3-xMgxNi9 (x = 0.45-1.2) alloys at 1173 K sintering temperature, as well as hydrogen storage properties of single-phase RE2MgNi9 (RE = La, Pr, Nd) alloys were subsequently studied. We found that when x increased from 0.45 to 1.0, entrance of Mg into Pr-2 sites of PuNi3-type phase resulted in a phase transformation from Gd2Co7-type to PuNi3-type, reaching the maximum solid solubility at x = 1.0 with a PuNi3-type single phase at 1173 K. As x further increased to 1.2, an MgCu4Sn-type secondary phase formed. That was the phase transformation occurs to increase the super-stacking phase possessing more [A(2)B(4)] slabs with increase of Mg content. Electrochemical results showed that single-phase alloy had good discharge capacity and superior cycling stability. Comparing with PuNi3-type single-phase La2MgNi9 and Nd2MgNi9 alloys, PuNi3-type single-phase Pr2MgNi9 alloy also exhibited preferable cycling stability and high rate dischargeability (HRD), which were 86.3% (at 100 cycles) and 56.7% (at a current density of 1500 mAg(-1)), respectively. (C) 2015 Elsevier Ltd. All rights reserved.
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