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研究了 4种具有A侧不同稀土组分的RE(NiCoMnAl) 5电极合金的微结构和电化学性能。研究结果表明 ,不论A侧稀土组分如何 ,铸态合金的显微组织为树枝晶形貌 ,晶体结构为CaCu5型六方结构 ,但合金的晶胞体积随着A侧La被其他稀土元素的替代而减小。A侧的稀土组分对合金电化学性能影响明显 ,A侧为纯La时 ,合金的电化学容量最大 ,倍率放电性能和充放电循环寿命较差 ;A侧的La被少量的Ce ,Pr ,Nd等稀土元素替代后 ,合金的电化学容量减小 ,倍率放电性能和循环寿命则有一定程度的改善 ,这与合金微结构的变化有关。
The microstructure and electrochemical properties of four RE (NiCoMnAl) 5 electrode alloys with A-side rare earth elements were studied. The results show that the microstructure of the as-cast alloy is dendrite morphology regardless of the rare earth component on the A side, and the crystal structure is a CaCu5-type hexagonal structure. However, the unit cell volume of the as-cast alloy is replaced by other rare earth elements And reduce. The rare earth component on A side has an obvious effect on the electrochemical performance of the alloy. When the A side is pure La, the electrochemical capacity of the alloy is the largest, the rate discharge performance and charge-discharge cycle life are poor; La on the A side is a small amount of Ce, Pr, Nd and other rare earth elements replaced, the electrochemical reduction of the alloy capacity, rate discharge performance and cycle life is to some extent improved, which changes with the microstructure of the alloy.