为了改善镍氢电池负极材料的循环稳定性能,采用真空感应电弧熔炼炉制备了 V2Ti0.5Cr0.5Ni1-xMox (x=0.02~0.08)合金,分析了不同含量的 Mo 替代 Ni 之后对合金电极的组织结构及电化学性能的影响。研究结果表明,电极材料主要由BCC结构的V基固溶体主相和TiNi二次相组成,随着合金中Mo替代Ni含量x由0.02增加到0.08,合金电极的放电容量先增加后降低,合金电极的循环稳定性能以及电化学动力学性能先得到改善而后降低,合金电极的综合性能均在x=0.04时达到最好。
In order to improve the cycle stability of Ni/MH battery, the V2Ti0.5Cr0.5Ni1-xMox(x=0.02-0.08) electrode alloys were prepared by arc-melting, and the effects of Mo content on microstructure and electrochemical properties were investigated systematically. The results show that all of the electrode materials mainly consist of a V-based solid solution phase with BCC structure and TiNi-based secondary phase which precipitates along the grain bound-ary of the BCC main phase. The electrochemical measurements indicate that the maximum discharge capacity of the alloy electrode increases firstly and then decreases with increasing x from 0.02 to 0.08. The cycle stability and elec-trochemical kinetic response of the alloy electrodes are strengthened firstly and then weakened, and reach the best performance at x=0.04.
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