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 Mm_0.78Mg_0.22Ni_2.48 Mn_0.09Al_0.23 Co_0.47( 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

Objective To improve the electrochemical properties of AB₃-type hydrogen storage alloy. Methods The AB₃ -type Mm_0.78Mg_0.22Ni_2.48Mn_0.09Al_0.23 Co_0.47( 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 fluorination treatment. The maximum discharge capacity was enhanced and the capacity retention rate C50 /Cmax increased from the original 83. 3% to 92. 8% . Furthermore, the kinetic properties of the alloy electrode were also improved. Conclusion The phase structure of the alloy was changed after fluorination treatment, and the electrochemical properties of the alloy were improved.