Ti基贮氢合金Ti0．3Zr0．225V0．25Mn0．3-xNi0．45＋x（x=0-0．25）的显微组织及电化学性能

为了改善Ti基贮氢合金的电化学性能，采用XRD，SEM及EDS分析了Ti0．3Zr0．225V0．25Mn0．3-xNi0．45＋x（x=，0．05，0．10，0．15，0．20，0．25）贮氢合金的相结构及相成分，并研究了合金的电化学性能。结果表明，合金均由六方结构的C14型Laves主相和立方结构的C15型Laves第二相构成；随着Ni替代量x的增大，合金的活化性能降低，而循环稳定性得到一定程度的改善。当Ni替代量x=0．05时，合金的放电容量达到最大，为426mAh／g，显示出很大的应用潜力.

The Microstructure and Electrochemical Properties of Ti0.3Zr0.225V0.25Mn0.3-xNi0.45+x(x=0~0.25) Ti-based Hydrogen Storage Alloys

In order to improve the electrochemical properties of Ti-based hydrogen storage alloys,the phase structures of Ti0.3Zr0.225V0.25Mn0.3-xNi0.45+x(x=0~0.25)hydrogen storage alloys were analyzed by XRD,SEM and EDS.The electrochemical properties of alloys were investigated.The results show that these alloys are composed of C14 Laves phase matrix with hexagonal structure and C15 Laves second phase with cubic structure.With the increase of x,the activation properties of alloys are decreased,while the cycle stabilities are improved.When x=0.05,the maximum discharge capacity of the alloy reaches to 426 mAh/g.These alloys show a great potential as negative electrode materials.