新能源汽车用储氢合金的制备与电化学性能研究  

Preparation and electrochemical property of hydrogen storage alloy for new energy vehicle

作　　者：刘冬梅[1] 肖润谋[2] 佘翔[3] Liu Dongmei;Xiao Runmou;She Xiang(Hangzhou Vocational&Technical College,Hangzhou 310018;Chang'an University,Xi'an 710064;Zhejiang Technical Institute of Economics,Hangzhou 310018)

机构地区：[1]杭州职业技术学院,杭州310018 [2]长安大学,西安710064 [3]浙江经济职业技术学院,杭州310018

出　　处：《化工新型材料》2021年第6期131-136,共6页New Chemical Materials

基　　金：国家自然科学基金(51472220)。

摘　　要：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I_(0)值和I_(L)值,且GNPs 1.5试样的I_(L)值明显高于AB5和BM45试样。GNPs 1.5试样具有最大的HRD(69.4%)和C_(3000)(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 I_(0)and I_(L)values of c-AB5/GNPs composite can be increased and the I_(L)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 C_(3000)(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.

关 键 词：储氢合金 球磨 石墨烯纳米片 显微形貌 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TM912[金属学及工艺—合金]