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本文研究了稀土元素对Ti0.26Zr0.07V0.24Mn0.1Ni0.33合金的微观结构和电化学性能的影响。结果表明,Ti0.26Zr0.07V0.24-xMn0.10Ni0.33REx(RE=Ce,Nd,Gd;x=0.01)合金均有V基固溶体相和C14型Laves相两相组成。合金中两相的晶格参数随加入稀土元素的不同而发生变化。稀土元素部分取代可改善合金电极的活化性能。然而,对合金电极的其他性能影响因元素种类不同而各异。Ce取代增大了合金电极的最大放电容量,Nd元素可以有效改善合金的高倍率放电性能。工作温度对合金电极的放电容量影响较大,Nd和Gd在333 K最大放电容量可达426和465 mAh.g-1。过高的温度使其循环容量衰减加剧。
In this paper, the effects of rare earth elements on the microstructure and electrochemical performance of Ti0.26Zr0.07V0.24Mn0.1Ni0.33 alloy were studied. The results show that there are two phases of V-based solid solution phase and C14-type Laves phase in Ti0.26Zr0.07V0.24-xMn0.10Ni0.33REx (RE = Ce, Nd, Gd; The lattice parameters of the two phases in the alloy change with the addition of rare earth elements. Partial replacement of rare earth elements can improve the activation of the alloy electrode. However, other performance effects on the alloy electrode vary depending on the element type. The Ce substitution increases the maximum discharge capacity of the alloy electrode, and the Nd element can effectively improve the high-rate discharge performance of the alloy. The working temperature has a great influence on the discharge capacity of the alloy electrode. The maximal discharge capacity of Nd and Gd at 333 K can reach 426 and 465 mAh.g-1. Excessive temperature exacerbates the degradation of its circulation capacity.