贮氢合金V_3TiNi_(0.56)Cr_x的充放电性能和吸放氢性能研究

Charge-discharge performance and hydriding-dehydriding properties of V_3TiNi_(0.56)Cr_x hydrogen storage alloys

以V2O5、TiO2等原料,用自蔓延高温合成法制备了钒基贮氢合金V3TiNi0.56Crx(x=0.1、0.3),用EDXRF、XRD等方法分析了合金的组织成分,用LK98BⅡ微机电化学分析系统、PCT测试仪分别测试了合金的充放电性能和吸放氢性能。结果表明:随Cr含量的增加,合金放电容量和吸氢量均降低;气态放氢平台的宽度变窄、倾斜度增加;电化学放电平台电压和气态放氢平台压力均增加;循环稳定性提高。

V-based hydrogen storage alloys V3TiNi0.56 Crx （x = 0. 1,0.3）, made with V2O5, TiO2 et al. by selfpropagating high- temperature synthesis （SHS）, were studied by EDXRF, XRD. Their charge-discharge performance and hydriding-dehydriding properties are investigated. The results show that the increase of chromium content in the alloys can decrease the dischargeability and the amount of hydrogen absorbed, narrow the gaseous hydrogen desorption plateau width and increase its gradient, enhance the electrochemical discharge plateau pressure and the gaseous hydrogen desorption plateau pressure,and improve the cycle stability of alloys.