Ni-metal hydride (NiMH) batteries should be recycled, as they contain base metals (Ni, Co) and rare earth elements (La, Ce). In this study, thermal and microwave treatments are investigated as a pre-treatment method for decomposing electrode material (Ni(OH)₂ and LaNi₅). The kinetic analysis of thermal decomposition electrode material yields the activation energy of 41.3 kJ/mol. The maximum percentage of lanthanum nickel oxide phase and cerium oxide phase is obtained at 1000°C of thermal treatment and 15 min of microwave exposure. The formation of melted balls of Ni and its oxide (Ni ~ 72.8%) was observed in microwave exposure, and the tendency of ball formation decreased with increasing exposure time. The effect of microwave exposure and thermal treatment on the acid leaching (1 M HCl, at S/L-1:20, at 70°C for 2 h) was studied. The leaching results showed NiO and CeO₂ phases in the leach residue of thermal and microwave treated products.

镍氢（NiMH）电池应回收利用，因为它们包含贱金属（Ni，Co）和稀土元素（La，Ce）。在这项研究中，研究了热处理和微波处理作为分解电极材料（Ni（OH）₂和LaNi ₅的预处理方法））。热分解电极材料的动力学分析得出活化能为41.3 kJ / mol。在1000°C的热处理和15分钟的微波照射下可获得镧镍氧化物相和铈氧化物相的最大百分比。在微波照射下观察到了镍及其氧化物（Ni〜72.8％）的熔化球的形成，并且随着曝光时间的增加，球的形成趋势降低。研究了微波暴露和热处理对酸浸（1 M HCl，在S / L-1：20，在70°C下2 h）的影响。浸出结果表明，热处理和微波处理产品的浸出残留物中有NiO和CeO ₂相。