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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Investigation on the structures and electrochemical performances of La_(0.75-x)Zr_xMg_(0.25)Ni_(3.2)Co_(0.2)Al_(0.1) (x = 0-0.2) electrode alloys prepared by melt spinning
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Investigation on the structures and electrochemical performances of La_(0.75-x)Zr_xMg_(0.25)Ni_(3.2)Co_(0.2)Al_(0.1) (x = 0-0.2) electrode alloys prepared by melt spinning

机译：熔融纺丝制备La_（0.75-x）Zr_xMg_（0.25）Ni_（3.2）Co_（0.2）Al_（0.1）（x = 0-0.2）电极合金的结构和电化学性能

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摘要

In order to improve the electrochemical cycle stability of the La-Mg-Ni system A_2B_7-type electrode alloys, La in the alloy was partially substituted by Zr and the melt-spinning technology was used for preparing La_(0.75-x)Zr_xMg_(0.25)Ni_(3.2)Co_(0.2)Al_(0.1) (x = 0, 0.05, 0.1, 0.15, 0.2) electrode alloys. The microstructures and electrochemical performances of the as-cast and quenched alloys were investigated in detail. The results obtained by XRD, SEM and TEM showed that the as-cast and quenched alloys have a multiphase structure which is composed of two main phases (La, Mg)Ni_3 and LaNi_5 as well as a residual phase LaNi_2. The substitution of Zr for La leads to an obvious increase of the LaNi_5 phase in the alloys, and it also helps the formation of a like amorphous structure in the as-quenched alloy. The results of the electrochemical measurement indicated that the substitution of Zr for La obviously decreased the discharge capacity of the as-cast and quenched alloys, but it significantly improved their cycle stability. The discharge capacity of the alloys (x < =0.1) first increased and then decreased with the variety of the quenching rate. The cycle stability of the alloys monotonously rose with increasing quenching rate.
机译：为了提高La-Mg-Ni系A_2B_7型电极合金的电化学循环稳定性，合金中的La部分被Zr取代，并采用熔纺技术制备La_（0.75-x）Zr_xMg_（0.25）。 Ni_（3.2）Co_（0.2）Al_（0.1）（x = 0，0.05，0.1，0.15，0.2）电极合金。详细研究了铸态和淬火合金的显微组织和电化学性能。 XRD，SEM和TEM分析结果表明，铸态和淬火合金具有多相结构，由两个主要相（La，Mg）Ni_3和LaNi_5以及残余相LaNi_2组成。用Zr代替La会导致合金中LaNi_5相的明显增加，并且还有助于在淬火后的合金中形成类似的非晶态结构。电化学测量结果表明，用Zr代替La明显降低了铸态和淬火合金的放电容量，但显着提高了其循环稳定性。合金的放电容量（x <= 0.1）随淬火速率的变化先增加然后降低。随着淬火速率的增加，合金的循环稳定性单调上升。

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