【作者】 王小林；

【导师】 李云辉； 王立民；

【作者基本信息】 长春理工大学 ， 应用化学， 2009， 硕士

【摘要】 本研究以AB₃型贮氢合金作为研究对象,研究了Al₁₂Mg₁₇-AB₅、Al₁₂Mg₁₇-AB₃及烧结法制备的La_0.7Mg_0.3Ni_2.5Co_0.4Mn_0.2Al_0.1合金的相结构及电化学性能,讨论了AB₃型合金成分、相结构与电化学性能的关系。研究结果表明,通过制备工艺和合金成分的优化,AB₃型贮氢合金的电化学贮氢性能明显提高。La_0.7Mg_0.3Ni_2.5Co_0.4Mn_0.2Al_0.1合金主要由（La,Mg）Ni₃和LaNi₅相构成,综合电化学性能最好。烧结时间对La_0.7Mg_0.3Ni_2.5Co_0.4Mn_0.2Al_0.1合金贮氢性能有明显影响,在1173K烧结4h的合金具有最大放电容量,其值达334mAh/g,在1173K烧结10h的样品循环稳定性最好,经100次循环后,容量保持率为69.1%。更多还原

【Abstract】 AB₃-type hydrogen storage alloy containing alkaline-earth metals was studied.The Al₁₂Mg₁₇-AB₅,Al₁₂Mg₁₇-AB₃ and La_0.7Mg_0.3N_i2.5Co_0.4Mn_0.2Al_0.1 alloys were prepared by sintering method,and phase structure and electrochemical properties of the above AB₃-type hydrogen storage alloys were investigated.The results shown that the phases of the sintered La_0.7Mg_0.3N_i2.5Co_0.4Mn_0.2Al_0.1alloy at different time were mainly consisted of the（La,Mg）Ni₃ and the LaNi₅,the electrochemical hydrogen storage properties were discriminating at different sintering time.The La_0.7Mg_0.3N_i2.5Co_0.4Mn_0.2Al_0.1 alloy exhibited best the electrochemical hydrogen storage properties,and the maximum discharge capacity is 334mAh/g sintered for 4 h,and the cycling capacity retention rate is 69.1%after 100 cycles sintered for 10 h at 1173 K.更多还原