论文部分内容阅读
采用悬浮熔炼加烧结的方法制备LaMgNi4-xCox(x=0,0.3,0.5)化合物。XRD的测试结果表明,所制得的LaMgNi4-xCox(x=0,0.3,0.5)均为单相,其结构为SnMgCu4(AuBe5型)。利用PCI对LaMgNi4在不同温度下的吸放氢性能进行测试,结果表明在373 K、4.3 MPa氢气的条件下吸氢量达到最大(1.45%),在吸氢过程中发生了由立方结构的α-LaMgNi4到正交结构的β-LaMgNi4H3.41再到立方结构的γ-LaMgNi4H4.87的变化,而放氢过程中只能观测到部分氢气放出。随着温度的升高,合金的吸氢量有所降低,同时吸氢平台的数量由2个变为1个,但吸氢动力学性能得到提高。采用模拟电池实验测试了LaMgNi4-xCox(x=0,0.3,0.5)的电化学性能,结果表明合金的最大放电容量随着Co含量的增加而增大。
LaMgNi4-xCox (x = 0, 0.3, 0.5) compounds were prepared by suspension melting and sintering. The results of XRD showed that LaMgNi4-xCox (x = 0, 0.3, 0.5) was single phase and its structure was SnMgCu4 (AuBe5 type). The hydrogen absorption and desorption properties of LaMgNi4 at different temperatures were tested by PCI. The results showed that hydrogen absorption reached the maximum (1.45%) at 373 K and hydrogen pressure of 4.3 MPa, and α -LaMgNi4 to the orthorhombic structure of β-LaMgNi4H3.41 to the cubic structure of γ-LaMgNi4H4.87 changes, while only part of the hydrogen evolution can be observed during hydrogen evolution. With the increase of temperature, the amount of hydrogen absorption of the alloy decreased, while the number of hydrogen absorption platform changed from 2 to 1, but the hydrogen absorption kinetic performance was improved. The electrochemical performance of LaMgNi4-xCox (x = 0, 0.3, 0.5) was tested by simulated battery. The results show that the maximum discharge capacity of the alloy increases with the increase of Co content.