研究了球磨和石墨烯纳米片(GNPs)含量对c-AB5/GNPs复合材料的相结构、显微组织和电化学性能的影响。结果表明,AB5、BM45和GNPs 1.5试样的相结构都为CaCu5型六方结构,GNPs的加入可以减小储氢合金的晶粒尺寸,并促进其非晶化;球磨45min后BM45试样的Rc和Rct都较AB5试样有所减小,且加入1.5% GNPs后进一步减小;球磨45min和加入1.5% GNPs都可以提升c-AB5/GNPs复合材料的I0值和IL值,且GNPs 1.5试样的IL值明显高于AB5和BM45试样。GNPs 1.5试样具有最大的HRD(69.4%)和C3000(177.9mAh/g),分别约为AB5试样的3.07倍和2.55倍,这主要是因为球磨处理和GNPs加入可以细化储氢合金的粒径、增加非晶化程度,以及可以连接毗邻活性物质,从而提升复合材料内部氢原子扩散至表面的扩散速率。
The effects of ball milling and GNPs content on the phase structure,microstructure and electrochemical properties of c-AB5/GNPs composite were studied.The results shown that the phase structure of AB5,BM45 and GNPs 1.5 were all of CaCu5 type hexagonal structure,and the addition of GNPs can reduce the grain size of hydrogen storage alloy and promoted its amorphization.After 45 minutes of ball milling,the Rc and Rct of BM45 sample were smaller than those of AB5 sample,and further decreased after adding 1.5% GNPs.After 45 minutes of ball milling and adding 1.5% GNPs,the I0 and IL values of c-AB5/GNPs composite can be increased and the IL value of GNPs 1.5 was significantly higher than that of AB5 and BM45 samples.GNPs 1.5 sample had the largest HRD (69.4%) and C3000 (177.9mAh/g),which were about 3.07 times and 2.55 times of AB5 sample,respectively.This was mainly related to the ball milling treatment and the addition of GNPs,which can refine the particle size of hydrogen storage alloy,increased the degree of amorphization,and improved the diffusion rate of hydrogen atoms in the composite to the surface.
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