用自蔓延高温合成法制备了钒基固溶体贮氢合金V3TiNi0.56Al0.2并进行热处理，通过X射线衍射对合金进行结构表征，并采用模拟电池和循环伏安法对其电化学性能进行研究.结果表明：1173、1573K热处理后，合金中第二相TiNi的衍射强度下降，合金的组织分布显得更为均匀，晶粒变大；热处理后合金充放电循环稳定性及高倍率放电性能得到改善，铸态合金的最大放电容量为350mAh·g-1，热处理合金充放电时最大放电容量大于铸态合金，且循环稳定性有明显的改善，氢在合金中的扩散系数增大，高倍率放电性能较好.
The hydrogen storage alloy V3TiNi0.56Al0.2 was prepared by self-propagation at high temperature and its structure was characterized by X-ray diffraction. Its electrochemical properties including the activation property, maximum discharge capacity and high rate discharge ability were evaluated after annealed at 1173K and 1573K by model cell and cycling voltammetry. The results show that after annealing, the diffraction intensities for TiNi in the alloy are weaken with the structure distribution of the alloy being more even and the grains of the alloy being bigger. The charge and discharge cycling stability and the high rate discharge of the alloys are improved by annealing. The maximum discharging capacity of the annealed alloy is not lower than that of the as-cast alloy (350mAh/g), while their cycling stability is improved markedly. The hydrogen diffusion coefficient of the alloy is increased as the annealing temperature increasing.
参考文献
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