目的：提高 AB3型储氢合金的电化学性能,扩大其应用范围。方法运用 HF 和 NaF 组成的溶液对 AB3型合金 Mm0.78 Mg0.22 Ni2.48 Mn0.09 Al0.23 Co0.47(Mm 由82.3% La 和17.7% Nd(均为原子数分数)组成)进行表面处理,考察改性处理对合金相结构、电化学性能以及动力学性能的影响。结果氟化处理后有 MgF2相生成,合金电极的最大放电容量得到提高,50次循环后的容量保持率由83.3%提高到92.8%。此外,合金的动力学性能也得到一定改善。结论氟化处理改变了合金的表面结构,提高了其电化学性能。
Objective To improve the electrochemical properties of AB3-type hydrogen storage alloy. Methods The AB3-type Mm0. 78 Mg0. 22 Ni2. 48 Mn0. 09 Al0. 23 Co0. 47(Mm consisted of 82. 3% La and 17. 7% Nd) alloy was modified by a solution consisting of HF and NaF. The effects of surface treatment on the phase structure, electrochemical properties and kinetic properties of the alloy were systematically investigated. Results XRD results showed that MgF2 was formed on the surface of the alloy particles after fluori-nation treatment. The maximum discharge capacity was enhanced and the capacity retention rate C50 / Cmax increased from the origi-nal 83. 3% to 92. 8% . Furthermore, the kinetic properties of the alloy electrode were also improved. Conclusion The phase struc-ture of the alloy was changed after fluorination treatment, and the electrochemical properties of the alloy were improved.
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