非晶Ti-Al储氢电极合金的制备及其电化学性能  

Preparations and Electrochemical Properties of Amorphous Ti-Al Alloys

作　　者：印龙 王新华[1,2] 李寿权 

机构地区：[1]浙江大学材料科学与工程学系,浙江杭州310027 [2]硅材料国家重点实验室,浙江杭州310027 [3]浙江省电池新材料与应用技术重点实验室,浙江杭州310027

出　　处：《材料科学与工程学报》2014年第2期194-199,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51171168);浙江省自然科学基金资助项目(Y4110147);浙江省公益资助项目(2013C31033)

摘　　要：采用真空感应悬浮熔炼法制备了Ti3Al合金,将合金粉碎后与Ni粉进行机械球磨,从而制得非晶态Ti-Al储氢电极合金。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、电化学测试等方法研究了Ti-Al合金的微结构和电化学性能。XRD分析表明,未添加Ni粉球磨后,Ti3Al合金不发生非晶态转变,而添加Ni粉球磨后,Ti3Al合金由晶态转变为非晶态。电化学测试表明未添加Ni粉的Ti3Al合金最大放电容量仅为100.7mA·h·g-1;当添加Ni粉与合金进行球磨之后,随着Ni粉添加量的增加,合金最大放电容量先增加后减小;当Ni粉添加量为200wt%时,合金最大放电容量达到最大值476.7mA·h·g-1。对Ti3Al+200wt%Ni合金的进一步研究表明,随着球磨时间的增加,其最大放电容量先增加后减小。总之,Ni促进了Ti-Al合金的非晶转变,改善了合金的电化学性能,Ni粉的添加量和球磨时间对合金的电化学性能有显著影响。Amorphous Ti-Al electrode alloys were prepared by ball-milling the Ti3Al alloy synthesized through vacuum induction levitation melting with Ni powder added.Microstructure and electrochemical properties of the Ti-Al alloys were studied by using X-ray diffraction(XRD),scanning electron microscopy(SEM)and electrochemical tests.It is found that the structure of Ti3Al will transform to amorphous state when milled with Ni powder,while this transformation will not occur if Ti3Al is milled at the absence of Ni powder.Electrochemical tests show that discharge capacity of nickel-free Ti3Al alloy is only 100.7mA·h·g-1. Maximum discharge capacity of Ti-Al alloys increases first and then decreases with increasing Ni content. Maximum discharge capacity of Ti3Al alloys with 200wt% Ni content reaches 476.7mA·h·g-1.For the Ti3Al+200wt% Ni alloy,maximum discharge capacity increases first and then decreases with increasing milling time.All in all,Ni addition promotes the crystalline-amorphous transformation of Ti-Al alloys and improves the electrochemical properties of Ti-Al alloys.In addition,the electrochemical properties of the alloys vary greatly with Ni content and milling time.

关 键 词：储氢电极合金 非晶合金 TI-AL 微结构 电化学性能 

分 类 号：O646[理学—物理化学]