LaNi_5系贮氢合金的软化学合成及其电化学性能研究  

The Soft Chemistry Synthesis of LaNi5 Storage Hydrogen Alloys and Their Electrochemical Properties

作　　者：张静娴[1] 唐晓鸣[1] 刘应亮[1] 陈文新[1] 

机构地区：[1]暨南大学化学系,广州510632

出　　处：《无机化学学报》2002年第2期181-184,共4页Chinese Journal of Inorganic Chemistry

基　　金：广东省重点科技攻关项目(No.99M02401G和No.2KM02304G)

摘　　要：应用燃烧法制出了约20nm的混合金属氧化物前躯体,用它和CaH2进行还原扩散反应,在850℃反应2h就可制得10μm以下的单相合金粉,如加少量助熔剂,在650℃即可完成还原扩散反应,得到的合金微粒大小只有2μm。这种方法制备的合金比熔炼合金的活化性能更好,850℃温度下反应得到的合金具有比熔炼合金更高的高倍率充放电容量。The nano metallic oxide precursors as storage hydrogen alloys have been synthesized by combustion method in air at low temperature (500degreesC) for the first time. The TEM photographs show that the radius of the precursors is about 20nm. The single and complex AB(5) alloys have been prepared by reduction diffusion method at 850degreesC with the precursors and CaH2 as reducer. The experiment illustrates that the particle size and distribution of AB, alloys can be controlled by that of the corresponding nano metallic oxide precursors. The XRD analysis proves that the single and complex AB5 alloys are single-phase and their particle radii are less than 10mum by SEM photograph analysis. If flux is added to the precursors in reductive process, the alloys with a particle size of 2mum can be obtained at 650degreesC. The electrochemical behavior of these alloys is examined. The result indicates that the alloys prepared by soft chemistry method has much better active behavior and the alloy prepared at 850degreesC has higher discharge capacity than the alloys prepared by melting method. This is the first time reporting that so small particle alloys are obtained by soft chemistry method at such a low temperature.

关 键 词：贮氢合金 软化学合成 电化学性能 镧镍合金 LANI5合金 合成 

分 类 号：TG139.7[一般工业技术—材料科学与工程] O646.5[金属学及工艺—合金]