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采用X射线衍射仪、扫描电镜和电化学测试设备,研究添加不同含量硼对(Ti0.65Zr0.35)1.10(V0.5Mn0.3Cr0.4Ni0.8)Bx(x=0,0.01,0.05,0.1,0.2)储氢合金组织结构和电化学性能的影响。结果表明,由于硼的添加,合金中出现了不易形成氢化物的棒状VB相,降低了合金的可逆放电容量,提高了合金的活化性能、循环稳定性和合金的倍率性能。分析表明,主要是由于棒状VB相增加了氢在合金中的扩散通道,增加了相界面,减小了合金在充放电过程中的晶格应力。合金电极的反应阻抗随着硼含量的增加而减小,合金的倍率性能和循环性能明显优化。
X-ray diffractometry, scanning electron microscopy and electrochemical testing equipment were used to study the effects of adding different amounts of boron on (Ti0.65Zr0.35) 1.10 (V0.5Mn0.3Cr0.4Ni0.8) Bx (x = 0,0.01,0.05,0.1 , 0.2) hydrogen storage alloy structure and electrochemical properties. The results show that due to the addition of boron, the rod-shaped VB phase which is not easy to form hydride appears in the alloy, which reduces the reversible discharge capacity of the alloy and improves the activation performance, cycle stability and alloy rate performance. The analysis shows that the rod-shaped VB phase increases the hydrogen diffusion channels in the alloy, increases the phase interface and reduces the lattice stress during the charge-discharge process. The reaction impedance of the alloy electrode decreases with the increase of boron content, and the rate performance and cycle performance of the alloy are obviously optimized.