The influence of Mg substitution on the phase structure and electrochemical properties of Nd1-xMgxNi3 (x=0.10-0.50) alloys
The influence of Mg substitution on the phase structure and electrochemical properties of Nd1-xMgxNi3 (x=0.10-0.50) alloys
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Mg替代对Nd1-xMgxNi3(x=0.10-0.50)合金相结构和电化学性能的影响
DOI：
10.1016/j.jallcom.2015.09.049
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发表时间：
2015-12
影响因子：
6.2
通讯作者：
Fan, Yanping
中科院分区：
文献类型：
--
作者：
Li, Yuan;Yang, Shuqin;Han, Shumin;Fan, Yanping
本文采用粉末烧结法制备了Nd 1 − xMgxNi 3（x= 0.10-0.50）合金作为镍氢电池负极材料。研究了Nd 1 − xMgxNi 3（x= 0.10-0.50）合金中Mg的固溶度和电化学性能。结果表明，当x从0.1增加到0.36时，合金由Ce 2Ni 7-、PuNi 3-和MgCu 4Sn型相组成的复相结构转变为PuNi 3型单相结构。当x进一步增加到0.5时，多余的Mg不能进一步进入PuNi 3型结构，形成MgNi 2第二相。结果表明，Mg在PuNi 3型（Nd，Mg）Ni 3中的最大固溶度为0.36。电化学研究表明，PuNi 3型单相Nd 0.64Mg 0.36Ni 3合金具有良好的放电容量，接近341 mAh g−1，以及上级高倍率放电性能，在1800 mA g−1的电流密度下，分别保持151 mAh g− 1。特别是，单相合金表现出优异的循环性能，在循环100次后，其保持288 mAh g-1。Mg含量是影响Nd-Mg-Ni基合金相结构和电化学性能的关键因素。当Mg的固溶度低于或高于合金的最大固溶度时，合金中会形成杂质相，不利于合金的循环稳定性。
In this paper, Nd1−xMgxNi3(x= 0.10–0.50) alloys as anode electrode materials of nickel metal hydride batteries were prepared by the powder sintering method. The solid solubility of Mg and electrochemical properties of the Nd1−xMgxNi3(x= 0.10–0.50) alloys were studied. It is found that whenxincreases from 0.1 to 0.36, the multiphase structure with Ce2Ni7-, PuNi3- and MgCu4Sn-type phases of the alloy changes to PuNi3-type single-phase structure. Asxfurther increases to 0.5, the extra Mg can not further enter into the PuNi3-type structure and forms an MgNi2secondary phase. It indicates that the maximum solid solubility of Mg in the PuNi3-type (Nd,Mg)Ni3phase is 0.36 at 1183 K. Electrochemical studies show the PuNi3-type single-phase Nd0.64Mg0.36Ni3alloy exhibits good discharge capacity, close to 341 mAh g−1, and superior high rate dischargeability, which remains 151 mAh g−1at a current density of 1800 mA g−1, respectively. Especially, the single-phase alloy exhibits excellent cycling property, which 288 mAh g−1retained after cycling 100 cycles. The content of Mg is a key factor that affects the phase structure and electrochemical properties for Nd–Mg–Ni-based alloy. Less than or more than the maximum solid solubility value of Mg are disadvantageous to the cycling stability of the alloy due to the formation of impurity phase in the alloys.
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影响因子：
6.2
作者：
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通讯作者：
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影响因子：
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