Effects of various annealing conditions on (Nd, Mg, Zr)(Ni, Al, Co)3.74 metal hydride alloys
Effects of various annealing conditions on (Nd, Mg, Zr)(Ni, Al, Co)3.74 metal hydride alloys
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DOI：
10.1016/j.jpowsour.2013.09.037
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发表时间：
2014-02
影响因子：
9.2
通讯作者：
K. Young;T. Ouchi;Baoquan Huang
中科院分区：
文献类型：
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作者：
K. Young;T. Ouchi;Baoquan Huang
研究发现，退火处理可有效提高合金的成分均匀性、主相A2B7的丰度、气相和电化学储氢容量，并有利于活化，提高电池的高倍率性能、电荷保持率和循环寿命。随着退火温度的升高，合金中A2B7相的丰度增加，合金的电化学性能也随之提高。将退火时间从5 h延长到16 h，进一步增加了A2B7相的丰度，但由于AB5催化相的还原而使高倍率放电性能恶化。
Annealing Nd-only AB3.74metal hydride alloy was found to effectively increase composition homogeneity, main A2B7phase abundance, and both gaseous phase and electrochemical hydrogen storage capacities, as well as to facilitate activation, and improve battery high-rate performance, charge retention, and cycle life. As the phase abundance of the main A2B7phase increases in the alloy with higher annealing temperatures, the general electrochemical performance improves. Extending the annealing period from 5 to 16 h further increases the A2B7phase abundance, but deteriorates the high-rate dischargeability due to the reduction of AB5catalytic phase.