【作者】 江冰洁； 穆道斌； 王敬； 吴锋；

【Author】 JIANG Bing-jie~(1,3),MU Dao-bin~(1,2),WANG Jing~(1,2),WU Feng~(1,2) (1.Beijing Key Laboratory of Environmental Science and Engineering,School of Chemical Engineering & the Environment,Beijing Institute of Technology,Beijing 100081,China; 2.National Development Center of Hi-Tech Green Materials,Beijing 100081,China; 3.Henan Province Energy Saving Monitor Center,Zhengzhou 450003,China)

【机构】 北京理工大学化工与环境学院环境科学与工程北京重点实验室； 河南省节能监测中心； 国家高技术绿色材料发展中心；

【摘要】 用固相扩散法制备了La_0.7Mg_0.3Ni_2.8Co_0.6Al_0.1贮氢合金,采用X射线衍射、电化学性能测试等方法,研究了合成温度对合金相结构和电化学性能的影响。发现合金由LaNi₅、La₂Ni₇和LaNi₃三相组成。合成温度偏低导致的元素扩散不均匀,以及合成温度偏高导致的Mg元素烧损量过多,均使得合金放电容量下降。研究表明,900℃下合成的合金具有最高放电容量373.1mAh/g。更多还原

【Abstract】 La_0.7Mg_0.3Ni_2.8Co_0.6Al_0.1 hydrogen storage alloys was prepared by solid diffusion reaction under argon atmosphere.The effect of synthesis temperature was studied.The phase structure and electrochemical performance of these alloys were investigated by means of XRD rietveld method and electrochemical testing.It was shown that all these alloys were consisted of LaNi₅,La₂Ni₇ and LaNi₃ phases.Synthesis temperature had obvious effect on the alloy.When the temperature was too low,more unkonwn phase exsited because that the elements diffusion was insufficient.And when the temperature was too high,the burn out rate of Mg element increased so that the discharge capacity decreased.When the synthesis temperature was 900℃,the alloy showed the best electrochemical performance,whose maximum discharge capacity was 373.1mAh/g.更多还原