低成本钒钛基储氢电极合金的成分结构设计及其电化学性能研究  

The Composition and Structure Designations and Electrochemical Properties of Low-cost V-Ti-based Hydrogen Storage Electrode Alloys

作　　者：张征宇[1] 高明霞[1] 

机构地区：[1]浙江大学材料科学与工程学院,浙江杭州310027

出　　处：《环境科学导刊》2017年第3期1-6,共6页Environmental Science Survey

基　　金：浙江省科技厅科学和技术创新团队项目(2010R50013)

摘　　要：钒钛基储氢电极合金具有高的电化学储氢容量,但其较高的成本和较差的循环性能影响了其在镍氢(Ni/MH)二次电池中的商业化应用。以低成本的商业钒铁为钒钛基储氢电极合金中钒的原材料,通过合金成分的优化设计及优化其中铬的含量,获得了具有良好综合电化学性能的低成本钒钛基储氢电极合金。合金具有优异的活化性能,在100mA/g的充放电条件下,最大放电容量可达315mAh/g,经100次循环后的容量保持率为80%;若调整合金成分,降低合金的最大放电容量至265mAh/g,则合金经100次循环后的容量保持率可高达95%。分析了合金的成分结构及其电化学性能的相关性。V - Ti - based hydrogen storage electrode alloys offer high electrochemical hydrogen storage capacity. However, their high cost and low cyclic stability impact their application in commercial Ni/MH batteries. In this research, a low - cost commercial V - Fe alloy was used as the raw material for the constituent of V instead of par-ticle pure V for the V - Ti - based hydrogen storage electrode alloys. By means of optimized composition designa-tion and optimization the content of Cr in the V - Ti - based alloys, high overall electrochemical performance and low - cost V - Ti - based hydrogen storage electrode alloys were achieved. The alloys showed high activation abil-ity. A maximum capacity of 315mAh/g coupling with the capacity retention of 80% after 100 cycles at 100 mAh/ g was obtained for an alloy. Superior high capacity retention of 95% after 100 cycles was obtained if adjusting the composition and lowering the maximum capacity to 265 mAh/g. Correlations among the composition, structure, and electrochemical properties of the V - Ti - based electrode alloys were discussed.

关 键 词：NI/MH电池 机钦基储氢电极合金 机铁 微观结构 电化学性能 

分 类 号：X13[环境科学与工程—环境科学]