摘要
利用电弧熔炼法制备了V2.1TiNi0.3Zrx（x=0-0.12）贮氢合金,系统研究了该系列合金的相结构和电化学性能。显微组织及X射线衍射XRD分析表明：无Zr合金由体心立方结构的V基固溶体主相和Ti Ni基第二相组成,当加入Zr后,合金第二相变为具有六方结构的C14型Laves相而主相不变,所有第二相均呈网状分布于主相晶界附近。随着Zr添加量的增加,合金主相的晶胞参数和晶胞体积呈增大趋势。电化学测试表明：添加一定量的Zr既能提高其活化性能,又能提高其最大放电比容量;同时,随着Zr添加量的增加,合金电极的高倍率放电能力及交换电流密度均有所提高。通过比较发现,V2.1TiNi0.3Zr0.06合金电极具有较好的综合性能。
V2.1TiNi0.3Zrx（x=0-0.12） hydrogen storage alloys were synthesized by vacuum arc melting method, and the phase structure and electrochemical properties were systematically investigated. The microstructure and XRD analysis show that the V2.1TiNi0.3 alloy consists of V-based solid solution main phases with a bcc structure and TiNi-based secondary phases. The secondary phase of the V2.1TiNi0.3Zrx（x=0.03-0.12） alloy changes into a C14-type Laves phase with hexagonal structure after the Zr element is added, and the main phases remain. The secondary phases of all alloys distribute near the grain boundaries of the main phase in a network structure. In addition, the cell parameters and volumes of the main phase show a increasing tendency with increasing Zr content. According to the electrochemical measurements, not only the activation ability but also the maximum discharge capacity is improved by adding moderate Zr content into the V2.1TiNi0.3 alloy. Moreover, the high-rate dischargeability and the exchange current density of the alloys are both improved. It is found that the alloy electrode of V2.1TiNi0.3Zr0.06 has better comprehensive performance in the investigated alloys.
出处
《电子元件与材料》
CAS
CSCD
2016年第7期37-41,共5页
Electronic Components And Materials
基金
四川省科技支撑计划项目(No.2012GZX0089)
四川省重点实验室项目(No.VTZ-2015003)
关键词
钒基贮氢电极合金
镍氢电池
Zr添加
显微结构
电化学性能
循环稳定性
V-based hydrogen storage alloy
Ni-MH battery
Zr addition
microstructure
electrochemical property
cycling stability
